[PVE-User] Strange ZFS Performance

Lindsay Mathieson lindsay.mathieson at gmail.com
Mon Aug 17 04:50:43 CEST 2015

Still experimenting with ZFS on a new server with proxmox 3.4. Current Setup

- Intel SSD 535 - ZFS

Data ZFS:
- 4 * WD Velocoraptor 600GB Drives
- SSD for SLOG and Cace
- ZIL capped at 4GB

It runs ok for a couple of days and then ZFS seems to go nuts. IO delays
goes over 50% until I kill the one VM that runs off the ZFS pool.

the whole system is then incredibly slow to use - ssh login takes 10-20
seconds. pveperf on the boot disk shows the following:

CPU BOGOMIPS:      140548.16
REGEX/SECOND:      972975
HD SIZE:           92.78 GB (rpool/ROOT/pve-1)
FSYNCS/SECOND:     10.00
DNS EXT:           126.03 ms
DNS INT:           22.12 ms (brian.softlog)

Truly terrible fsync. The data pool is the same. The only cure seems to be
a reboot.

Server has 64GB RAM and Dual Intel E5-2660

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