CentOS - Sep 2017 - cyrus spool on btrfs?

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?

       mark

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.

It remains to be tested how the hardware RAID performs, which may be even
better than the SSDs.

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".

Thanks.
Valeri
>
> 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
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