On 21/01/2021 11:34, n...@li.nux.ro wrote:
Hi,
I used SharedMountPoint a very long time ago with GlusterFS before
Cloudstack had native integration.
Don't remember the details, but overall my impression was that it worked
surprisingly well, of course back then there weren't as many feature, so
less stuff to test. I would give it a go.
As a side note, I did also use iSCSI with CLVM with success, it was
quite fast. I ended up doing it because it was difficult to get OCFS
running on EL6 and GFS2 had a reputation for being very slow. Marcus has
a lot of experience with this, might want to get in touch with him:
https://www.slideshare.net/MarcusLSorensen/cloud-stack-clvm
I assume you used CLVM with Corosync?
My concern with LVM is:
- No thin provisioning (when used with CloudStack)
- No snapshots (Right?)
- Not very much used
OCFS2 doesn't have my preference either, but otherwise you have to use
corosync.
Anybody else otherwise using CLVM?
Wido
HTH,
Lucian
On 2021-01-21 09:32, Wido den Hollander wrote:
Hi,
For a specific use-case I'm looking into the possibility to use iSCSI
in combination with KVM.
Use-case: Low-latenc I/O with 4k blocks and QD=1
KVM with CloudStack doesn't support iSCSI natively and the docs and
other blogs refer to using 'SharedMountPoint' with OCFS2 or GFS2:
-
http://docs.cloudstack.apache.org/en/latest/adminguide/storage.html#hypervisor-support-for-primary-storage
-
https://www.shapeblue.com/installing-and-configuring-an-ocfs2-clustered-file-system/
It has been a really long time since I've used OCFS2 and I wanted to
see what experiences from other people are.
How is the stability and performance of OFCS2? It seems that
performance should be rather good as lock/s is a problem with
clustered filesystems, but since we only lock the QCOW2 file on boot
of the VM that shouldn't be an issue.
In addition to OCFS2, how mature is 'SharedMountPoint' as a storage
pool with KVM. Does is support all the features NFS supports?
Thanks,
Wido
