[PVE-User] Strange ZFS Performance

Lindsay Mathieson lindsay.mathieson at gmail.com
Mon Aug 17 04:57:31 CEST 2015


nb, the data drive is ZFS RAID10

On 17 August 2015 at 12:50, Lindsay Mathieson <lindsay.mathieson at gmail.com>
wrote:

> Still experimenting with ZFS on a new server with proxmox 3.4. Current
> Setup
>
> BOOT:
> - 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
>
> --
> Lindsay
>



-- 
Lindsay
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