Looks like things might be slightly different now in 4.2, with
KVMStorageProcessor.java in the mix.This looks more or less like some
of the commands were ripped out verbatim from LibvirtComputingResource
and placed here, so in general what I've said is probably still true,
just that the location of things like AttachVolumeCommand might be
different, in this file rather than LibvirtComputingResource.java.
On Fri, Sep 13, 2013 at 11:42 PM, Marcus Sorensen <shadow...@gmail.com> wrote:
> Ok, KVM will be close to that, of course, because only the hypervisor
> classes differ, the rest is all mgmt server. Creating a volume is just
> a db entry until it's deployed for the first time. AttachVolumeCommand
> on the agent side (LibvirtStorageAdaptor.java is analogous to
> CitrixResourceBase.java) will do the iscsiadm commands (via a KVM
> StorageAdaptor) to log in the host to the target and then you have a
> block device. Maybe libvirt will do that for you, but my quick read
> made it sound like the iscsi libvirt pool type is actually a pool, not
> a lun or volume, so you'll need to figure out if that works or if
> you'll have to use iscsiadm commands.
>
> If you're NOT going to use LibvirtStorageAdaptor (because Libvirt
> doesn't really manage your pool the way you want), you're going to
> have to create a version of KVMStoragePool class and a StorageAdaptor
> class (see LibvirtStoragePool.java and LibvirtStorageAdaptor.java),
> implementing all of the methods, then in KVMStorageManager.java
> there's a "_storageMapper" map. This is used to select the correct
> adaptor, you can see in this file that every call first pulls the
> correct adaptor out of this map via getStorageAdaptor. So you can see
> a comment in this file that says "add other storage adaptors here",
> where it puts to this map, this is where you'd register your adaptor.
>
> So, referencing StorageAdaptor.java, createStoragePool accepts all of
> the pool data (host, port, name, path) which would be used to log the
> host into the initiator. I *believe* the method getPhysicalDisk will
> need to do the work of attaching the lun. AttachVolumeCommand calls
> this and then creates the XML diskdef and attaches it to the VM. Now,
> one thing you need to know is that createStoragePool is called often,
> sometimes just to make sure the pool is there. You may want to create
> a map in your adaptor class and keep track of pools that have been
> created, LibvirtStorageAdaptor doesn't have to do this because it asks
> libvirt about which storage pools exist. There are also calls to
> refresh the pool stats, and all of the other calls can be seen in the
> StorageAdaptor as well. There's a createPhysical disk, clone, etc, but
> it's probably a hold-over from 4.1, as I have the vague idea that
> volumes are created on the mgmt server via the plugin now, so whatever
> doesn't apply can just be stubbed out (or optionally
> extended/reimplemented here, if you don't mind the hosts talking to
> the san api).
>
> There is a difference between attaching new volumes and launching a VM
> with existing volumes. In the latter case, the VM definition that was
> passed to the KVM agent includes the disks, (StartCommand).
>
> I'd be interested in how your pool is defined for Xen, I imagine it
> would need to be kept the same. Is it just a definition to the SAN
> (ip address or some such, port number) and perhaps a volume pool name?
>
>> If there is a way for me to update the ACL list on the SAN to have only a
>> single KVM host have access to the volume, that would be ideal.
>
> That depends on your SAN API. I was under the impression that the
> storage plugin framework allowed for acls, or for you to do whatever
> you want for create/attach/delete/snapshot, etc. You'd just call your
> SAN API with the host info for the ACLs prior to when the disk is
> attached (or the VM is started). I'd have to look more at the
> framework to know the details, in 4.1 I would do this in
> getPhysicalDisk just prior to connecting up the LUN.
>
>
> On Fri, Sep 13, 2013 at 10:27 PM, Mike Tutkowski
> <mike.tutkow...@solidfire.com> wrote:
>> OK, yeah, the ACL part will be interesting. That is a bit different from how
>> it works with XenServer and VMware.
>>
>> Just to give you an idea how it works in 4.2 with XenServer:
>>
>> * The user creates a CS volume (this is just recorded in the cloud.volumes
>> table).
>>
>> * The user attaches the volume as a disk to a VM for the first time (if the
>> storage allocator picks the SolidFire plug-in, the storage framework invokes
>> a method on the plug-in that creates a volume on the SAN...info like the IQN
>> of the SAN volume is recorded in the DB).
>>
>> * CitrixResourceBase's execute(AttachVolumeCommand) is executed. It
>> determines based on a flag passed in that the storage in question is
>> "CloudStack-managed" storage (as opposed to "traditional" preallocated
>> storage). This tells it to discover the iSCSI target. Once discovered it
>> determines if the iSCSI target already contains a storage repository (it
>> would if this were a re-attach situation). If it does contain an SR already,
>> then there should already be one VDI, as well. If there is no SR, an SR is
>> created and a single VDI is created within it (that takes up about as much
>> space as was requested for the CloudStack volume).
>>
>> * The normal attach-volume logic continues (it depends on the existence of
>> an SR and a VDI).
>>
>> The VMware case is essentially the same (mainly just substitute datastore
>> for SR and VMDK for VDI).
>>
>> In both cases, all hosts in the cluster have discovered the iSCSI target,
>> but only the host that is currently running the VM that is using the VDI (or
>> VMKD) is actually using the disk.
>>
>> Live Migration should be OK because the hypervisors communicate with
>> whatever metadata they have on the SR (or datastore).
>>
>> I see what you're saying with KVM, though.
>>
>> In that case, the hosts are clustered only in CloudStack's eyes. CS controls
>> Live Migration. You don't really need a clustered filesystem on the LUN. The
>> LUN could be handed over raw to the VM using it.
>>
>> If there is a way for me to update the ACL list on the SAN to have only a
>> single KVM host have access to the volume, that would be ideal.
>>
>> Also, I agree I'll need to use iscsiadm to discover and log in to the iSCSI
>> target. I'll also need to take the resultant new device and pass it into the
>> VM.
>>
>> Does this sound reasonable? Please call me out on anything I seem incorrect
>> about. :)
>>
>> Thanks for all the thought on this, Marcus!
>>
>>
>> On Fri, Sep 13, 2013 at 8:25 PM, Marcus Sorensen <shadow...@gmail.com>
>> wrote:
>>>
>>> Perfect. You'll have a domain def ( the VM), a disk def, and the attach
>>> the disk def to the vm. You may need to do your own StorageAdaptor and run
>>> iscsiadm commands to accomplish that, depending on how the libvirt iscsi
>>> works. My impression is that a 1:1:1 pool/lun/volume isn't how it works on
>>> xen at the momen., nor is it ideal.
>>>
>>> Your plugin will handle acls as far as which host can see which luns as
>>> well, I remember discussing that months ago, so that a disk won't be
>>> connected until the hypervisor has exclusive access, so it will be safe and
>>> fence the disk from rogue nodes that cloudstack loses connectivity with. It
>>> should revoke access to everything but the target host... Except for during
>>> migration but we can discuss that later, there's a migration prep process
>>> where the new host can be added to the acls, and the old host can be removed
>>> post migration.
>>>
>>> On Sep 13, 2013 8:16 PM, "Mike Tutkowski" <mike.tutkow...@solidfire.com>
>>> wrote:
>>>>
>>>> Yeah, that would be ideal.
>>>>
>>>> So, I would still need to discover the iSCSI target, log in to it, then
>>>> figure out what /dev/sdX was created as a result (and leave it as is - do
>>>> not format it with any file system...clustered or not). I would pass that
>>>> device into the VM.
>>>>
>>>> Kind of accurate?
>>>>
>>>>
>>>> On Fri, Sep 13, 2013 at 8:07 PM, Marcus Sorensen <shadow...@gmail.com>
>>>> wrote:
>>>>>
>>>>> Look in LibvirtVMDef.java (I think) for the disk definitions. There are
>>>>> ones that work for block devices rather than files. You can piggy back off
>>>>> of the existing disk definitions and attach it to the vm as a block
>>>>> device.
>>>>> The definition is an XML string per libvirt XML format. You may want to
>>>>> use
>>>>> an alternate path to the disk rather than just /dev/sdx like I mentioned,
>>>>> there are by-id paths to the block devices, as well as other ones that
>>>>> will
>>>>> be consistent and easier for management, not sure how familiar you are
>>>>> with
>>>>> device naming on Linux.
>>>>>
>>>>> On Sep 13, 2013 8:00 PM, "Marcus Sorensen" <shadow...@gmail.com> wrote:
>>>>>>
>>>>>> No, as that would rely on virtualized network/iscsi initiator inside
>>>>>> the vm, which also sucks. I mean attach /dev/sdx (your lun on
>>>>>> hypervisor) as
>>>>>> a disk to the VM, rather than attaching some image file that resides on a
>>>>>> filesystem, mounted on the host, living on a target.
>>>>>>
>>>>>> Actually, if you plan on the storage supporting live migration I think
>>>>>> this is the only way. You can't put a filesystem on it and mount it in
>>>>>> two
>>>>>> places to facilitate migration unless its a clustered filesystem, in
>>>>>> which
>>>>>> case you're back to shared mount point.
>>>>>>
>>>>>> As far as I'm aware, the xenserver SR style is basically LVM with a xen
>>>>>> specific cluster management, a custom CLVM. They don't use a filesystem
>>>>>> either.
>>>>>>
>>>>>> On Sep 13, 2013 7:44 PM, "Mike Tutkowski"
>>>>>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>
>>>>>>> When you say, "wire up the lun directly to the vm," do you mean
>>>>>>> circumventing the hypervisor? I didn't think we could do that in CS.
>>>>>>> OpenStack, on the other hand, always circumvents the hypervisor, as far
>>>>>>> as I
>>>>>>> know.
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Sep 13, 2013 at 7:40 PM, Marcus Sorensen <shadow...@gmail.com>
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Better to wire up the lun directly to the vm unless there is a good
>>>>>>>> reason not to.
>>>>>>>>
>>>>>>>> On Sep 13, 2013 7:40 PM, "Marcus Sorensen" <shadow...@gmail.com>
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> You could do that, but as mentioned I think its a mistake to go to
>>>>>>>>> the trouble of creating a 1:1 mapping of CS volumes to luns and then
>>>>>>>>> putting
>>>>>>>>> a filesystem on it, mounting it, and then putting a QCOW2 or even RAW
>>>>>>>>> disk
>>>>>>>>> image on that filesystem. You'll lose a lot of iops along the way,
>>>>>>>>> and have
>>>>>>>>> more overhead with the filesystem and its journaling, etc.
>>>>>>>>>
>>>>>>>>> On Sep 13, 2013 7:33 PM, "Mike Tutkowski"
>>>>>>>>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>
>>>>>>>>>> Ah, OK, I didn't know that was such new ground in KVM with CS.
>>>>>>>>>>
>>>>>>>>>> So, the way people use our SAN with KVM and CS today is by
>>>>>>>>>> selecting SharedMountPoint and specifying the location of the share.
>>>>>>>>>>
>>>>>>>>>> They can set up their share using Open iSCSI by discovering their
>>>>>>>>>> iSCSI target, logging in to it, then mounting it somewhere on their
>>>>>>>>>> file
>>>>>>>>>> system.
>>>>>>>>>>
>>>>>>>>>> Would it make sense for me to just do that discovery, logging in,
>>>>>>>>>> and mounting behind the scenes for them and letting the current code
>>>>>>>>>> manage
>>>>>>>>>> the rest as it currently does?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Fri, Sep 13, 2013 at 7:27 PM, Marcus Sorensen
>>>>>>>>>> <shadow...@gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>> Oh, hypervisor snapshots are a bit different. I need to catch up
>>>>>>>>>>> on the work done in KVM, but this is basically just disk snapshots
>>>>>>>>>>> + memory
>>>>>>>>>>> dump. I still think disk snapshots would preferably be handled by
>>>>>>>>>>> the SAN,
>>>>>>>>>>> and then memory dumps can go to secondary storage or something
>>>>>>>>>>> else. This is
>>>>>>>>>>> relatively new ground with CS and KVM, so we will want to see how
>>>>>>>>>>> others are
>>>>>>>>>>> planning theirs.
>>>>>>>>>>>
>>>>>>>>>>> On Sep 13, 2013 7:20 PM, "Marcus Sorensen" <shadow...@gmail.com>
>>>>>>>>>>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Let me back up and say I don't think you'd use a vdi style on an
>>>>>>>>>>>> iscsi lun. I think you'd want to treat it as a RAW format.
>>>>>>>>>>>> Otherwise you're
>>>>>>>>>>>> putting a filesystem on your lun, mounting it, creating a QCOW2
>>>>>>>>>>>> disk image,
>>>>>>>>>>>> and that seems unnecessary and a performance killer.
>>>>>>>>>>>>
>>>>>>>>>>>> So probably attaching the raw iscsi lun as a disk to the VM, and
>>>>>>>>>>>> handling snapshots on the San side via the storage plugin is best.
>>>>>>>>>>>> My
>>>>>>>>>>>> impression from the storage plugin refactor was that there was a
>>>>>>>>>>>> snapshot
>>>>>>>>>>>> service that would allow the San to handle snapshots.
>>>>>>>>>>>>
>>>>>>>>>>>> On Sep 13, 2013 7:15 PM, "Marcus Sorensen" <shadow...@gmail.com>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Ideally volume snapshots can be handled by the SAN back end, if
>>>>>>>>>>>>> the SAN supports it. The cloudstack mgmt server could call your
>>>>>>>>>>>>> plugin for
>>>>>>>>>>>>> volume snapshot and it would be hypervisor agnostic. As far as
>>>>>>>>>>>>> space, that
>>>>>>>>>>>>> would depend on how your SAN handles it. With ours, we carve out
>>>>>>>>>>>>> luns from a
>>>>>>>>>>>>> pool, and the snapshot spave comes from the pool and is
>>>>>>>>>>>>> independent of the
>>>>>>>>>>>>> LUN size the host sees.
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Sep 13, 2013 7:10 PM, "Mike Tutkowski"
>>>>>>>>>>>>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hey Marcus,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I wonder if the iSCSI storage pool type for libvirt won't work
>>>>>>>>>>>>>> when you take into consideration hypervisor snapshots?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On XenServer, when you take a hypervisor snapshot, the VDI for
>>>>>>>>>>>>>> the snapshot is placed on the same storage repository as the
>>>>>>>>>>>>>> volume is on.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Same idea for VMware, I believe.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> So, what would happen in my case (let's say for XenServer and
>>>>>>>>>>>>>> VMware for 4.3 because I don't support hypervisor snapshots in
>>>>>>>>>>>>>> 4.2) is I'd
>>>>>>>>>>>>>> make an iSCSI target that is larger than what the user requested
>>>>>>>>>>>>>> for the
>>>>>>>>>>>>>> CloudStack volume (which is fine because our SAN thinly
>>>>>>>>>>>>>> provisions volumes,
>>>>>>>>>>>>>> so the space is not actually used unless it needs to be). The
>>>>>>>>>>>>>> CloudStack
>>>>>>>>>>>>>> volume would be the only "object" on the SAN volume until a
>>>>>>>>>>>>>> hypervisor
>>>>>>>>>>>>>> snapshot is taken. This snapshot would also reside on the SAN
>>>>>>>>>>>>>> volume.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> If this is also how KVM behaves and there is no creation of
>>>>>>>>>>>>>> LUNs within an iSCSI target from libvirt (which, even if there
>>>>>>>>>>>>>> were support
>>>>>>>>>>>>>> for this, our SAN currently only allows one LUN per iSCSI
>>>>>>>>>>>>>> target), then I
>>>>>>>>>>>>>> don't see how using this model will work.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Perhaps I will have to go enhance the current way this works
>>>>>>>>>>>>>> with DIR?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> What do you think?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:28 PM, Mike Tutkowski
>>>>>>>>>>>>>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> That appears to be the way it's used for iSCSI access today.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I suppose I could go that route, too, but I might as well
>>>>>>>>>>>>>>> leverage what libvirt has for iSCSI instead.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:26 PM, Marcus Sorensen
>>>>>>>>>>>>>>> <shadow...@gmail.com> wrote:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> To your question about SharedMountPoint, I believe it just
>>>>>>>>>>>>>>>> acts like a
>>>>>>>>>>>>>>>> 'DIR' storage type or something similar to that. The end-user
>>>>>>>>>>>>>>>> is
>>>>>>>>>>>>>>>> responsible for mounting a file system that all KVM hosts can
>>>>>>>>>>>>>>>> access,
>>>>>>>>>>>>>>>> and CloudStack is oblivious to what is providing the storage.
>>>>>>>>>>>>>>>> It could
>>>>>>>>>>>>>>>> be NFS, or OCFS2, or some other clustered filesystem,
>>>>>>>>>>>>>>>> cloudstack just
>>>>>>>>>>>>>>>> knows that the provided directory path has VM images.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:23 PM, Marcus Sorensen
>>>>>>>>>>>>>>>> <shadow...@gmail.com> wrote:
>>>>>>>>>>>>>>>> > Oh yes, you can use NFS, LVM, and iSCSI all at the same
>>>>>>>>>>>>>>>> > time.
>>>>>>>>>>>>>>>> > Multiples, in fact.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > On Fri, Sep 13, 2013 at 6:19 PM, Mike Tutkowski
>>>>>>>>>>>>>>>> > <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>> >> Looks like you can have multiple storage pools:
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >> mtutkowski@ubuntu:~$ virsh pool-list
>>>>>>>>>>>>>>>> >> Name State Autostart
>>>>>>>>>>>>>>>> >> -----------------------------------------
>>>>>>>>>>>>>>>> >> default active yes
>>>>>>>>>>>>>>>> >> iSCSI active no
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >> On Fri, Sep 13, 2013 at 6:12 PM, Mike Tutkowski
>>>>>>>>>>>>>>>> >> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> Reading through the docs you pointed out.
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> I see what you're saying now.
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> You can create an iSCSI (libvirt) storage pool based on
>>>>>>>>>>>>>>>> >>> an iSCSI target.
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> In my case, the iSCSI target would only have one LUN, so
>>>>>>>>>>>>>>>> >>> there would only
>>>>>>>>>>>>>>>> >>> be one iSCSI (libvirt) storage volume in the (libvirt)
>>>>>>>>>>>>>>>> >>> storage pool.
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> As you say, my plug-in creates and destroys iSCSI
>>>>>>>>>>>>>>>> >>> targets/LUNs on the
>>>>>>>>>>>>>>>> >>> SolidFire SAN, so it is not a problem that libvirt does
>>>>>>>>>>>>>>>> >>> not support
>>>>>>>>>>>>>>>> >>> creating/deleting iSCSI targets/LUNs.
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> It looks like I need to test this a bit to see if libvirt
>>>>>>>>>>>>>>>> >>> supports
>>>>>>>>>>>>>>>> >>> multiple iSCSI storage pools (as you mentioned, since
>>>>>>>>>>>>>>>> >>> each one of its
>>>>>>>>>>>>>>>> >>> storage pools would map to one of my iSCSI targets/LUNs).
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> On Fri, Sep 13, 2013 at 5:58 PM, Mike Tutkowski
>>>>>>>>>>>>>>>> >>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> LibvirtStoragePoolDef has this type:
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> public enum poolType {
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> ISCSI("iscsi"), NETFS("netfs"),
>>>>>>>>>>>>>>>> >>>> LOGICAL("logical"), DIR("dir"),
>>>>>>>>>>>>>>>> >>>> RBD("rbd");
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> String _poolType;
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> poolType(String poolType) {
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> _poolType = poolType;
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> }
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> @Override
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> public String toString() {
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> return _poolType;
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> }
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> }
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> It doesn't look like the iSCSI type is currently being
>>>>>>>>>>>>>>>> >>>> used, but I'm
>>>>>>>>>>>>>>>> >>>> understanding more what you were getting at.
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> Can you tell me for today (say, 4.2), when someone
>>>>>>>>>>>>>>>> >>>> selects the
>>>>>>>>>>>>>>>> >>>> SharedMountPoint option and uses it with iSCSI, is that
>>>>>>>>>>>>>>>> >>>> the "netfs" option
>>>>>>>>>>>>>>>> >>>> above or is that just for NFS?
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> Thanks!
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> On Fri, Sep 13, 2013 at 5:50 PM, Marcus Sorensen
>>>>>>>>>>>>>>>> >>>> <shadow...@gmail.com>
>>>>>>>>>>>>>>>> >>>> wrote:
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> Take a look at this:
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> http://libvirt.org/storage.html#StorageBackendISCSI
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> "Volumes must be pre-allocated on the iSCSI server, and
>>>>>>>>>>>>>>>> >>>>> cannot be
>>>>>>>>>>>>>>>> >>>>> created via the libvirt APIs.", which I believe your
>>>>>>>>>>>>>>>> >>>>> plugin will take
>>>>>>>>>>>>>>>> >>>>> care of. Libvirt just does the work of logging in and
>>>>>>>>>>>>>>>> >>>>> hooking it up to
>>>>>>>>>>>>>>>> >>>>> the VM (I believe the Xen api does that work in the Xen
>>>>>>>>>>>>>>>> >>>>> stuff).
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> What I'm not sure about is whether this provides a 1:1
>>>>>>>>>>>>>>>> >>>>> mapping, or if
>>>>>>>>>>>>>>>> >>>>> it just allows you to register 1 iscsi device as a
>>>>>>>>>>>>>>>> >>>>> pool. You may need
>>>>>>>>>>>>>>>> >>>>> to write some test code or read up a bit more about
>>>>>>>>>>>>>>>> >>>>> this. Let us know.
>>>>>>>>>>>>>>>> >>>>> If it doesn't, you may just have to write your own
>>>>>>>>>>>>>>>> >>>>> storage adaptor
>>>>>>>>>>>>>>>> >>>>> rather than changing LibvirtStorageAdaptor.java. We
>>>>>>>>>>>>>>>> >>>>> can cross that
>>>>>>>>>>>>>>>> >>>>> bridge when we get there.
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> As far as interfacing with libvirt, see the java
>>>>>>>>>>>>>>>> >>>>> bindings doc.
>>>>>>>>>>>>>>>> >>>>> http://libvirt.org/sources/java/javadoc/ Normally,
>>>>>>>>>>>>>>>> >>>>> you'll see a
>>>>>>>>>>>>>>>> >>>>> connection object be made, then calls made to that
>>>>>>>>>>>>>>>> >>>>> 'conn' object. You
>>>>>>>>>>>>>>>> >>>>> can look at the LibvirtStorageAdaptor to see how that
>>>>>>>>>>>>>>>> >>>>> is done for
>>>>>>>>>>>>>>>> >>>>> other pool types, and maybe write some test java code
>>>>>>>>>>>>>>>> >>>>> to see if you
>>>>>>>>>>>>>>>> >>>>> can interface with libvirt and register iscsi storage
>>>>>>>>>>>>>>>> >>>>> pools before you
>>>>>>>>>>>>>>>> >>>>> get started.
>>>>>>>>>>>>>>>> >>>>>
>>>>>>>>>>>>>>>> >>>>> On Fri, Sep 13, 2013 at 5:31 PM, Mike Tutkowski
>>>>>>>>>>>>>>>> >>>>> <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>> >>>>> > So, Marcus, I need to investigate libvirt more, but
>>>>>>>>>>>>>>>> >>>>> > you figure it
>>>>>>>>>>>>>>>> >>>>> > supports
>>>>>>>>>>>>>>>> >>>>> > connecting to/disconnecting from iSCSI targets,
>>>>>>>>>>>>>>>> >>>>> > right?
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> > On Fri, Sep 13, 2013 at 5:29 PM, Mike Tutkowski
>>>>>>>>>>>>>>>> >>>>> > <mike.tutkow...@solidfire.com> wrote:
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >> OK, thanks, Marcus
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >> I am currently looking through some of the classes
>>>>>>>>>>>>>>>> >>>>> >> you pointed out
>>>>>>>>>>>>>>>> >>>>> >> last
>>>>>>>>>>>>>>>> >>>>> >> week or so.
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >> On Fri, Sep 13, 2013 at 5:26 PM, Marcus Sorensen
>>>>>>>>>>>>>>>> >>>>> >> <shadow...@gmail.com>
>>>>>>>>>>>>>>>> >>>>> >> wrote:
>>>>>>>>>>>>>>>> >>>>> >>>
>>>>>>>>>>>>>>>> >>>>> >>> Yes, my guess is that you will need the iscsi
>>>>>>>>>>>>>>>> >>>>> >>> initiator utilities
>>>>>>>>>>>>>>>> >>>>> >>> installed. There should be standard packages for
>>>>>>>>>>>>>>>> >>>>> >>> any distro. Then
>>>>>>>>>>>>>>>> >>>>> >>> you'd call
>>>>>>>>>>>>>>>> >>>>> >>> an agent storage adaptor to do the initiator login.
>>>>>>>>>>>>>>>> >>>>> >>> See the info I
>>>>>>>>>>>>>>>> >>>>> >>> sent
>>>>>>>>>>>>>>>> >>>>> >>> previously about LibvirtStorageAdaptor.java and
>>>>>>>>>>>>>>>> >>>>> >>> libvirt iscsi
>>>>>>>>>>>>>>>> >>>>> >>> storage type
>>>>>>>>>>>>>>>> >>>>> >>> to see if that fits your need.
>>>>>>>>>>>>>>>> >>>>> >>>
>>>>>>>>>>>>>>>> >>>>> >>> On Sep 13, 2013 4:55 PM, "Mike Tutkowski"
>>>>>>>>>>>>>>>> >>>>> >>> <mike.tutkow...@solidfire.com>
>>>>>>>>>>>>>>>> >>>>> >>> wrote:
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> Hi,
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> As you may remember, during the 4.2 release I
>>>>>>>>>>>>>>>> >>>>> >>>> developed a SolidFire
>>>>>>>>>>>>>>>> >>>>> >>>> (storage) plug-in for CloudStack.
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> This plug-in was invoked by the storage framework
>>>>>>>>>>>>>>>> >>>>> >>>> at the necessary
>>>>>>>>>>>>>>>> >>>>> >>>> times
>>>>>>>>>>>>>>>> >>>>> >>>> so that I could dynamically create and delete
>>>>>>>>>>>>>>>> >>>>> >>>> volumes on the
>>>>>>>>>>>>>>>> >>>>> >>>> SolidFire SAN
>>>>>>>>>>>>>>>> >>>>> >>>> (among other activities).
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> This is necessary so I can establish a 1:1 mapping
>>>>>>>>>>>>>>>> >>>>> >>>> between a
>>>>>>>>>>>>>>>> >>>>> >>>> CloudStack
>>>>>>>>>>>>>>>> >>>>> >>>> volume and a SolidFire volume for QoS.
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> In the past, CloudStack always expected the admin
>>>>>>>>>>>>>>>> >>>>> >>>> to create large
>>>>>>>>>>>>>>>> >>>>> >>>> volumes ahead of time and those volumes would
>>>>>>>>>>>>>>>> >>>>> >>>> likely house many
>>>>>>>>>>>>>>>> >>>>> >>>> root and
>>>>>>>>>>>>>>>> >>>>> >>>> data disks (which is not QoS friendly).
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> To make this 1:1 mapping scheme work, I needed to
>>>>>>>>>>>>>>>> >>>>> >>>> modify logic in
>>>>>>>>>>>>>>>> >>>>> >>>> the
>>>>>>>>>>>>>>>> >>>>> >>>> XenServer and VMware plug-ins so they could
>>>>>>>>>>>>>>>> >>>>> >>>> create/delete storage
>>>>>>>>>>>>>>>> >>>>> >>>> repositories/datastores as needed.
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> For 4.3 I want to make this happen with KVM.
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> I'm coming up to speed with how this might work on
>>>>>>>>>>>>>>>> >>>>> >>>> KVM, but I'm
>>>>>>>>>>>>>>>> >>>>> >>>> still
>>>>>>>>>>>>>>>> >>>>> >>>> pretty new to KVM.
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> Does anyone familiar with KVM know how I will need
>>>>>>>>>>>>>>>> >>>>> >>>> to interact with
>>>>>>>>>>>>>>>> >>>>> >>>> the
>>>>>>>>>>>>>>>> >>>>> >>>> iSCSI target? For example, will I have to expect
>>>>>>>>>>>>>>>> >>>>> >>>> Open iSCSI will be
>>>>>>>>>>>>>>>> >>>>> >>>> installed on the KVM host and use it for this to
>>>>>>>>>>>>>>>> >>>>> >>>> work?
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> Thanks for any suggestions,
>>>>>>>>>>>>>>>> >>>>> >>>> Mike
>>>>>>>>>>>>>>>> >>>>> >>>>
>>>>>>>>>>>>>>>> >>>>> >>>> --
>>>>>>>>>>>>>>>> >>>>> >>>> Mike Tutkowski
>>>>>>>>>>>>>>>> >>>>> >>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >>>>> >>>> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >>>>> >>>> o: 303.746.7302
>>>>>>>>>>>>>>>> >>>>> >>>> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >>
>>>>>>>>>>>>>>>> >>>>> >> --
>>>>>>>>>>>>>>>> >>>>> >> Mike Tutkowski
>>>>>>>>>>>>>>>> >>>>> >> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >>>>> >> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >>>>> >> o: 303.746.7302
>>>>>>>>>>>>>>>> >>>>> >> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> >
>>>>>>>>>>>>>>>> >>>>> > --
>>>>>>>>>>>>>>>> >>>>> > Mike Tutkowski
>>>>>>>>>>>>>>>> >>>>> > Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >>>>> > e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >>>>> > o: 303.746.7302
>>>>>>>>>>>>>>>> >>>>> > Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>>
>>>>>>>>>>>>>>>> >>>> --
>>>>>>>>>>>>>>>> >>>> Mike Tutkowski
>>>>>>>>>>>>>>>> >>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >>>> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >>>> o: 303.746.7302
>>>>>>>>>>>>>>>> >>>> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>>
>>>>>>>>>>>>>>>> >>> --
>>>>>>>>>>>>>>>> >>> Mike Tutkowski
>>>>>>>>>>>>>>>> >>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >>> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >>> o: 303.746.7302
>>>>>>>>>>>>>>>> >>> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >> --
>>>>>>>>>>>>>>>> >> Mike Tutkowski
>>>>>>>>>>>>>>>> >> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>>> >> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>>> >> o: 303.746.7302
>>>>>>>>>>>>>>>> >> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>> Mike Tutkowski
>>>>>>>>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>>> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>>> o: 303.746.7302
>>>>>>>>>>>>>>> Advancing the way the world uses the cloud™
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>> Mike Tutkowski
>>>>>>>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>>>>>> e: mike.tutkow...@solidfire.com
>>>>>>>>>>>>>> o: 303.746.7302
>>>>>>>>>>>>>> Advancing the way the world uses the cloud™
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Mike Tutkowski
>>>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>>>>> e: mike.tutkow...@solidfire.com
>>>>>>>>>> o: 303.746.7302
>>>>>>>>>> Advancing the way the world uses the cloud™
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Mike Tutkowski
>>>>>>> Senior CloudStack Developer, SolidFire Inc.
>>>>>>> e: mike.tutkow...@solidfire.com
>>>>>>> o: 303.746.7302
>>>>>>> Advancing the way the world uses the cloud™
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Mike Tutkowski
>>>> Senior CloudStack Developer, SolidFire Inc.
>>>> e: mike.tutkow...@solidfire.com
>>>> o: 303.746.7302
>>>> Advancing the way the world uses the cloud™
>>
>>
>>
>>
>> --
>> Mike Tutkowski
>> Senior CloudStack Developer, SolidFire Inc.
>> e: mike.tutkow...@solidfire.com
>> o: 303.746.7302
>> Advancing the way the world uses the cloud™
