[CentOS] cyrus spool on btrfs?

Fri Sep 8 15:00:46 UTC 2017
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Fri, September 8, 2017 9:48 am, hw wrote:
> m.roth at 5-cent.us wrote:
>> hw wrote:
>>> Mark Haney wrote:
>> <snip>
>>>> BTRFS isn't going to impact I/O any more significantly than, say, XFS.
>>> But mdadm does, the impact is severe.  I know there are ppl saying
>>> otherwise, but I´ve seen the impact myself, and I definitely don´t
>>> want
>>> it on that particular server because it would likely interfere with
>>> other services.
>> <snip>
>> I haven't really been following this thread, but if your requirements
>> are
>> that heavy, you're past the point that you need to spring some money and
>> buy hardware RAID cards, like LSI, er, Avago, I mean, who's bought them
>> more recently?
> Heavy requirements are not required for the impact of md-RAID to be
> noticeable.
> Hardware RAID is already in place, but the SSDs are "extra" and, as I
> said,
> not suited to be used with hardware RAID.

Could someone, please, elaborate on the statement that "SSDs are not
suitable for hardware RAID".


> It remains to be tested how the hardware RAID performs, which may be even
> better than the SSDs.
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247