Local Disk is not possible for HA . If you can accept NFS, then HA is not an issue .
On Mon, Oct 12, 2020 at 2:42 PM Pratik Chandrakar < chandrakarpra...@gmail.com> wrote: > Hi Andrija, > I have a similar requirement like Hean. So what's your recommendation for > HA with NFS/Local disk? > > > On Sat, Oct 10, 2020 at 8:55 AM Hean Seng <heans...@gmail.com> wrote: > > > Hi Andrija > > > > I am planning on a high end hypervisor , AMD EYPCv2 7742 CPU that get > > 64core and 128thread , 384G RAM, etc , and multiple 10G card bnond or > 40G > > card for storage network. > > > > On this kind of server, probably get up to 200 VM per hypervisor. I'm > > just afraid that NFS will create a bottleneck if the storage server is > > running a lower-end Hardware on storage. > > > > For ISCSI, normally won't be an issue of hardware cpu in storage server > and > > it act almost like external hard disk, while NFS needs to process the > file > > system in Storage. > > > > I had read through many articles, and mentioned GFS2 has many issues. I > > initially planned to run OCFS2, but it does not support REDHAT any more, > > and there is a bug on Ubuntu18 , not sure if solved. OCFS2 should be a > lot > > more stable and less issue compare GFS2 > > > > this is ocfs2 on ubuntu bug, which i am facing exactly the same. > > https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1895010 > > > > > > > > > > > > > > On Fri, Oct 9, 2020 at 6:41 PM Andrija Panic <andrija.pa...@gmail.com> > > wrote: > > > > > free advice - try to avoid Clustered File Systems always - due to > > > complexity, and sometimes due to the utter lack of reliability (I had, > > > outside of ACS, an awful experience with GFS2, set by RedHat themself > > for a > > > former customer), etc - so Shared Mount point is to be skipped, if > > > possible. > > > > > > Local disks - there are some downsides to VM live migration - so make > > sure > > > to understand the limits and options. > > > iSCSI = same LUN attached to all KVM hosts = you again need Clustered > > File > > > System, and that will be, again, consumed as Shared Mount point. > > > > > > For NFS, you are on your own when it comes to the performance and > > tunning - > > > this is outside of ACS - usually no high CPU usage on a moderately used > > NFS > > > server. > > > > > > Best, > > > > > > On Thu, 8 Oct 2020 at 18:45, Hean Seng <heans...@gmail.com> wrote: > > > > > > > For using NFS, do you have performance issue like Storage CPU > getting > > > very > > > > high ? And i believe this could be cause the the filesystem is > make > > at > > > > Storage instead of Compute Node. > > > > > > > > Thus i am thinking of is ISCSI or LocalStorage. > > > > > > > > For ISCSI, i prefer if can running on LVM , which i believe > performance > > > > shall be the best , compared localstroage where file-based. > > > > > > > > But facing issue of ISCSI is ShareMount point need Clustered File > > > System, > > > > otherwise you can only setup one Cluster one Host. Setting up > > Cluster > > > > File system is issue here, GFS2 is no more support on CentOS / > > Redhat, > > > > and there is bug in Ubuntu 18. > > > > > > > > > > > > > > > > > > > > > > > > On Thu, Oct 8, 2020 at 6:54 PM Andrija Panic < > andrija.pa...@gmail.com> > > > > wrote: > > > > > > > > > NFS is the rock-solid, and majority of users are using NFS, I can > > tell > > > > that > > > > > for sure. > > > > > Do understand there is some difference between cheap white-box NFS > > > > solution > > > > > and a proprietary $$$ NFS solution, when it comes to performance. > > > > > > > > > > Some users will use Ceph, some local disks (this is all KVM so far) > > > > > VMware users might be heavy on iSCSI datastores, > > > > > > > > > > And that is probably true for 99% of ACS users - rest might be > > > > > experimenting with clustered solutions via OCFS/GFS2 (shared > > > mountpoint) > > > > or > > > > > Gluster etc - but that is all not really suitable for a serious > > > > production > > > > > usage IMO (usually,but there might be exceptions to this). > > > > > > > > > > SolidFire is also a $$$ solution that works very well, depending on > > > your > > > > > hypervisor (best integration so far I believe is with KVM in ACS). > > > > > > > > > > Hope that helps > > > > > > > > > > On Mon, 14 Sep 2020 at 04:50, Hean Seng <heans...@gmail.com> > wrote: > > > > > > > > > > > HI > > > > > > > > > > > > I just wonder what storage you all use for CloudStack ? And the > > > number > > > > > of > > > > > > VM able to get spinned up for storage you use ? > > > > > > > > > > > > Can anybody share the experience ? > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > Regards, > > > > > > Hean Seng > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > Andrija Panić > > > > > > > > > > > > > > > > > -- > > > > Regards, > > > > Hean Seng > > > > > > > > > > > > > -- > > > > > > Andrija Panić > > > > > > > > > -- > > Regards, > > Hean Seng > > > > > -- > *Regards,* > *Pratik Chandrakar* > Scientist-C > NIC - Chhattisgarh State Centre > *Hall no.-AD2-14 ,* *2nd Floor * > Mahanadi Bhavan , Mantralaya , New Raipur > -- Regards, Hean Seng
