[zfs-discuss] ZFS on RAID-5 array

Pascal Meunier pmeunier at purdue.edu
Fri Apr 13 15:23:37 EDT 2018


Thank you, I appreciate the advice and will try it.

On Fri, 2018-04-13 at 19:57 +0200, Gionatan Danti wrote:
> Il 13-04-2018 19:23 Pascal Meunier via zfs-discuss ha scritto:
> > This is on a Dell with an HBA330 (no RAID support;  reported by
> > omreport as "HBA330
> > Mini" and by lspci as an LSI SAS3008).  In the thread "Slow read
> > performance", it was
> > suggested to force the write cache on using sdparm.  Is it better to
> > let ZFS manage it
> > and not use sdparm?
> 
> If I remember correctly, DELL H200/300/330 automatically disable the 
> disk private cache.
> You should be able to permanently re-enable it via the BIOS/UEFI 
> configuration utility or, at the very least, via OpenManage (you don't 
> need the full OpenManage stack, rather the "omconfig storage" CLI part). 
> Anyway, I think that even hdparm/sdparm can re-enable the disk caching.
> 
> I definitely suggest you to re-enable caching, as ZFS flushes it at 
> critical points to prevent any data corruption due to bad caching/write 
> reordering.
> 


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