Date: Sat, 22 Sep 2007 15:37:12 +0400 From: Michael Monashev <softsearch@gmail.com> To: Pawel Jakub Dawidek <freebsd-geom@freebsd.org> Subject: Re[2]: raidtest for zfs Message-ID: <135686599.20070922153712@gmail.com> In-Reply-To: <20070922011847.GH9445@garage.freebsd.pl> References: <dcf881c30709210406j59603347vba8494eb5105932c@mail.gmail.com> <20070921143318.GC5690@garage.freebsd.pl> <dcf881c30709210933s6d92cb2dh830be87fb067037c@mail.gmail.com> <20070921170506.GB9445@garage.freebsd.pl> <1310567292.20070921235802@gmail.com> <20070922011847.GH9445@garage.freebsd.pl>
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Здравствуйте, Pawel.
> What's strange about those results? Can you show us 'zpool status' and
> explain what you expect and why?
> zpool status
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad6s1 ONLINE 0 0 0
ad8s2 ONLINE 0 0 0
ad10s3 ONLINE 0 0 0
ad12s1 ONLINE 0 0 0
ad14s2 ONLINE 0 0 0
errors: No known data errors
I compare graid5, graid3+gcache, raidz. My target is find software
RAID with better read performance and huge storage size. I planing
place a lot of little (1-100kb) images on it.
Here is my test results: http://michael.mindmix.ru/168-958-rezul-taty-testirovanija-graid5-graid3-gcache-i-raidz.zhtml
graid3+gcache with round-robin reading is 1.25 faster than 1 disk.
graid5 is 2.18 faster than 1 disk.
raidz is 7.7 faster than 1 disk.
5 disks cant read faster than 5 times. raidz is 7.7 faster than 1
disk!
This is strange for me.
>> [...] How to turn off zfs cache completely?
> You can't, but for reading you just need to export/import your pool to
> get rid of existing cache.
--
С уважением,
Michael mailto:softsearch@gmail.com
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