Best practises for filesystems on iSCSI?

[Underphil]

Hi all,

So one of the issues that I *think* we all face is the inability to take snapshots on the host side when using LVM over iSCSI.

In my environment, I've added iSCSI LUNs through the interface, manually created a primary partition and an EXT4 filesystem on them, then mounted them through the fstab and added them as 'folder' storage in the ProxMox interface.

This gives me the ability to use qcow2 files and use the native snapshotting of ProxMox, which is a feature I'd like to continue to use.

In terms of best practises, are there any pitfalls of this method to using iSCSI in this way? Performance hits (other than the additional filesystem layer) or other unexpected issues?

 

[Underphil]

Actually, I've just realised the pitfall of my own problem. That I'll have single volume mounted on multiple nodes and have a split-brain situation.

Hmm. So when using storage that only supports iSCSI (no NFS, no CIFS, no ZFS) what are the options for native snapshots, if any?

 

[wolfgang]

Hi,
if you storage-box supports no snapshots and you have to use iscsi the only way I know is use a cluster file system on it.

Cluster File systems what fits here are
OCFS2 and GFS2