Hi Gregory,
Reading your reply with great interest, thanks.
Can you confirm my understanding now:
- live snapshots are more expensive for the cluster as a whole, than
taking the snapshot when the VM is switched off?
- using fstrim in VMs is (much?) more expensive when the VM has existing
snapshots?
- it might be worthwhile to postpone upgrading from hammer to jewel,
until after your big accouncement?
- we are on xfs (both for the ceph OSDs and the VMs) and that is the
best combination to avoid these slow requests and CoW overhead with
snapshots (or at least to minimise their impact)
Any other tips, do's or don'ts, or things to keep in mind related to
snapshots, VM/OSD filesystems, or using fstrim..?
(our cluster is also small, hammer, three servers with 8 OSDs each, and
journals on ssd, plenty of cpu/ram)
Again, thanks for your interesting post.
MJ
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