Thank you everyone for the explanations. Still on this subject: I created an host and attached a disk. For a second host, for use a shared iscsi storage, I just need add disk to second client? I tried this: > disk add pool1/vmware_iscsi1 Warning: 'pool1/vmware_iscsi1' mapped to 1 other client(s) ok
It's a problem, or is correct? Regards Gesiel Em sex, 20 de set de 2019 às 20:13, Mike Christie <[email protected]> escreveu: > On 09/20/2019 01:52 PM, Gesiel Galvão Bernardes wrote: > > Hi, > > I'm testing Ceph with Vmware, using Ceph-iscsi gateway. I reading > > documentation* and have doubts some points: > > > > - If I understanded, in general terms, for each VMFS datastore in VMware > > will match the an RBD image. (consequently in an RBD image I will > > possible have many VMWare disks). Its correct? > > > > - In documentation is this: "gwcli requires a pool with the name rbd, so > > it can store metadata like the iSCSI configuration". In part 4 of > > "Configuration", have: "Add a RBD image with the name disk_1 in the pool > > rbd". In this part, the use of "rbd" pool is a example and I could use > > any pool for storage of image, or the pool should be "rbd"? > > Resuming: gwcli require "rbd" pool for metadata and I could use any pool > > for image, or i will use just "rbd pool" for storage image and metadata? > > > > - How much memory ceph-iscsi use? Which is a good number of RAM? > > > > The major memory use is: > > 1. In RHEL 7.5 kernels and older we allocate max_data_area_mb of kernel > memory per device. The default value for that is 8. You can use gwcli to > configure it. It is allocated when the device is created. In newer > kernels, there is pool of memory and each device can use up to > max_data_area_mb worth of it. The per device default is the same and you > can change it with gwcli. The total pool limit is 2 GB. There is a sysfs > file: > > /sys/module/target_core_user/parameters/global_max_data_area_mb > > that can be used to change it. > > 2. Each device uses about 20 MB of memory in userspace. This is not > configurable. >
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