Date: Fri, 12 Apr 2013 13:44:47 +0400 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Charles Sprickman <spork@bway.net> Cc: freebsd-fs@FreeBSD.org Subject: Re: ZFS-inly server and dedicated ZIL Message-ID: <alpine.BSF.2.00.1304121342090.58348@woozle.rinet.ru> In-Reply-To: <D416AA98-D78A-4743-A1E6-AA2C28B9A602@bway.net> References: <alpine.BSF.2.00.1304101713530.38433@woozle.rinet.ru> <D416AA98-D78A-4743-A1E6-AA2C28B9A602@bway.net>
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On Thu, 11 Apr 2013, Charles Sprickman wrote:
> On Apr 10, 2013, at 9:23 AM, Dmitry Morozovsky wrote:
>
> > Dear colleagues,
> >
> > I'm planning to make new PostgreSQL server using zaid10-like ZFS with two SSDs
> > splitted into mirrored ZIL and striped arc2.
>
> This might seem like an odd suggestion, but if you're putting the pool on
> SSDs (is that correct?), I'd totally skip the separate ZIL device and ARC.
> I think you'll find the SSDs will need zero help from another log device and
> L2ARC is probably just not that helpful for DB loads.
No, this will be 8*SAS in 4 mirrored pairs + 2*SSD for mirrored ZIL and striped
l2arc. Like the following (this is from other machine, but similar in setup):
NAME STATE READ WRITE CKSUM
pn ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da0 ONLINE 0 0 0
da6 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
da1 ONLINE 0 0 0
da7 ONLINE 0 0 0
logs
mirror-1 ONLINE 0 0 0
da2d ONLINE 0 0 0
da3d ONLINE 0 0 0
cache
da2e ONLINE 0 0 0
da3e ONLINE 0 0 0
--
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer: marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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