Date: Thu, 6 Jun 2013 02:57:05 +0400 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: TRIM support through ciss Message-ID: <alpine.BSF.2.00.1306060253430.48048@woozle.rinet.ru> In-Reply-To: <22BEEC35F8964CACB8E625DA3068A12F@multiplay.co.uk> References: <alpine.BSF.2.00.1306060157240.48048@woozle.rinet.ru> <22BEEC35F8964CACB8E625DA3068A12F@multiplay.co.uk>
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On Wed, 5 Jun 2013, Steven Hartland wrote:
> For ZFS you really don't want to use a HW RAID, its much better
> to just give ZFS the raw disks as you gain nice features like
> self healing :)
I know this well, and use it for a dozen servers with regular SATA
("enterprrize-grade" though, like WD RE4s) extensively; however, ciss does not
provide an easy way to expose disks -- only via RAID0 per disk
> I've never used ciss, but if you can configure the disks as
> JBOD it may mean it can then support a delete method.
>
> In addition for TRIM to work all data disks in a pool need to
> support a delete method. L2ARC disks are treated seperately.
well, to be a bit more precise: SSDs are split to have mirrored ZIL and
splitted L2ARC, and SASes are mirrored in pairs:
root@briareus:/usr/src# zpool status
pool: br
state: ONLINE
scan: scrub repaired 0 in 0h0m with 0 errors on Fri Apr 26 15:29:32 2013
config:
NAME STATE READ WRITE CKSUM
br ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gpt/br0 ONLINE 0 0 0
gpt/br4 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
gpt/br1 ONLINE 0 0 0
gpt/br5 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
gpt/br6 ONLINE 0 0 0
gpt/br2 ONLINE 0 0 0
mirror-3 ONLINE 0 0 0
gpt/br3 ONLINE 0 0 0
gpt/br7 ONLINE 0 0 0
logs
mirror-4 ONLINE 0 0 0
gpt/br-zil0 ONLINE 0 0 0
gpt/br-zil1 ONLINE 0 0 0
cache
gpt/br-cache0 ONLINE 0 0 0
gpt/br-cache1 ONLINE 0 0 0
errors: No known data errors
All I need is TRIM support for ZIL and L2ARC...
--
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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