Re: IO fluctuation
On Saturday 21 August 2010 19:48:32 Steffen Neubauer wrote: I think I can exclude the ZFS implementation too, because I tried dd if=/dev/da0 of=/dev/null and executed killall -SIGINFO dd while it was copying and it looked like it stalled randomly too. Not related your problem, but you can press ^T to send SIGINFO to the currently running process. Saves some typing :-) - Pieter ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: IO fluctuation
Hello Steffen, How did you setup your drives in ZFS ? stripe ? what bsd version do you have and what platform ? Do you see this big fluctuation when copying some big file like say and iso or movie ? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: IO fluctuation
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: NAMESTATE READ WRITE CKSUM tankONLINE 0 0 0 raidz1ONLINE 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 r...@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-unsubscr...@freebsd.org
Re: IO fluctuation
On Sat, 21 Aug 2010 20:29:05 +0200 Steffen Neubauer stefr...@stefreak.de wrote: 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... It _is_ the EARS: the hang is probably the drive spinning back up after it's turned itself off - it has really aggressive power management by default. For more information about the variation, see http://maycontaintracesofbolts.blogspot.com/2010/08/benchmarking-advanced-format-drives.html -- Bruce Cran ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: IO fluctuation
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 stefr...@stefreak.dewrote: 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: NAMESTATE READ WRITE CKSUM tankONLINE 0 0 0 raidz1ONLINE 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 r...@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-unsubscr...@freebsd.org -- Regards, Jason Leschnik. Mob. 0432 35 4224 Uni mail. jml...@uow.edu.au Work mail. j...@ansto.gov.au ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
