• This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn more.

ZFS in a VM Host Box


Active member
Has anyone ever tried running their site on a ZFS system with whatever drive configuration? I'm currently trying this with a decently-sized board and it seems to be working fine:

4 x 7200 RPM disk with ZFS in RAID 10
2 x Intel SSD with the following partition setup:
- mdadm running RAID 1 for installing CentOS 7 on a 20 GB partition (one per drive)
- One partition per SSD for ZIL/SLOG (5 GB mirror)
- One partition per SSD for L2ARC (rest of the drive, striped)

I'm running KVM on top of this setup with a ZFS ZVOL for each VM. It appears to the VM to be a normal block device and gains all the benefits of ZFS with compression, caching, data integrity, snapshots, and flexibility with the potential to do send/receive to another server to back up the entire VM at once.
The last point is something I haven't fully tested yet - my expectation is that a ZFS snapshot has the potential to catch the database in the middle of a transaction and cause a table crash or similar if you revert to the snapshot.