Date: Sun, 22 Aug 2010 13:13:57 +1000 From: Jason Leschnik <leschnik@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: IO fluctuation Message-ID: <AANLkTikNMoxmio=Yg9x4ghpqxS95dD=s2LAM6exqcr4f@mail.gmail.com> In-Reply-To: <4C701AF1.7030304@stefreak.de> References: <4C701170.9080306@stefreak.de> <AANLkTimNEqh6ewUuuFhgP15W=bgnSqqx=KGU8AdgArW1@mail.gmail.com> <4C701AF1.7030304@stefreak.de>
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http://forums.freebsd.org/showthread.php?t=17036&; This is a good starting point, there is also some good info using certain tools to force the drives to not goto spindown sleep. On Sun, Aug 22, 2010 at 4:29 AM, Steffen Neubauer <stefreak@stefreak.de>wrote: > Hello Claudiu :) > > Sorry that I didn't answer these obvious questions in my first post. > > Am 21.08.2010 20:16, schrieb claudiu vasadi: > > How did you setup your drives in ZFS ? stripe ? >> > > raidz1 .... Here is my zpool status output: > > # 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 > gptid/7b91a9b4-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > gptid/7cebaf7b-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > gptid/7e43d7a2-ab05-11df-8c6e-001d7d004144 ONLINE 0 0 > 0 > > errors: No known data errors > > > what bsd version do you have and what platform ? >> > > # uname -a > FreeBSD tank 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC > 2010 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 > > > > Do you see this big fluctuation when copying some big file like say and >> iso >> or movie ? >> > > Both, on small filesystem access and when copying big files. > When I'm listening to music with VLC over NFS it stalls regularly. > When I'm working on the shell the commands block randomly for a certain > time. > > But I get that fluctuation on raw device access, too, look: > > # dd if=/dev/ad0 of=/dev/zero bs=1M > ^C0+0 records in > 0+0 records out > 0 bytes transferred in 9.848682 secs (0 bytes/sec) > # dd if=/dev/ad0 of=/dev/zero bs=1M > ^C1056+0 records in > 1056+0 records out > 1107296256 bytes transferred in 9.492375 secs (116651130 bytes/sec) > > So this is not a zfs problem. But I don't think it's the hardware, too - I > used that mainboard before FreeBSD with no problems. > And the WD EARS drives can't be the problem on raw device access, too, > because I used bs=1M, that should be enough... > > This is really strange... > > Greetings, > Steffen > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > -- Regards, Jason Leschnik. Mob. 0432 35 4224 Uni mail. jml974@uow.edu.au Work mail. jll@ansto.gov.au
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