Date: Thu, 21 Jul 2011 22:34:11 +0200 From: Ivan Voras <ivoras@freebsd.org> To: Luiz Otavio O Souza <lists.br@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS and large directories - caveat report Message-ID: <CAF-QHFX3-DASRAb75b2ruyTTZ5ypmSvrbvJckRmtyPMramRf%2Bw@mail.gmail.com> In-Reply-To: <0DBC88EC-7907-4DEE-8086-E3071590F800@gmail.com> References: <j09hk8$svj$1@dough.gmane.org> <13577F3E-DE59-44F4-98F7-9587E26499B8@gmail.com> <CAF-QHFUs7OAAwcFvSymc3YYX3Cdq%2BQUUSP_4OFXCegCbzLkOUA@mail.gmail.com> <E3F8D6EC-2CCA-49A2-9BFD-982BF01A3531@bitgravity.com> <5542D910-0C5C-4B2B-885F-CC92901367F0@gmail.com> <CAF-QHFVGWO9-sxZAw-sFyoVZVTs=HQN0AX=4OpeaGv4_qLhWLw@mail.gmail.com> <CAF-QHFUf_PV0RQ5sUJhnZGD04-BSbE0_mNW%2BshBGB-7YaPz-1w@mail.gmail.com> <0DBC88EC-7907-4DEE-8086-E3071590F800@gmail.com>
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On 21 July 2011 22:31, Luiz Otavio O Souza <lists.br@gmail.com> wrote: > On Jul 21, 2011, at 5:04 PM, Ivan Voras wrote: > >> The "load.." lines in between are =C2=A0me hitting Ctrl-T for process in= fo. >> Observe almost 20 seconds delay in the middle of "ls"! > > What do you have for the the first column on gstat (L(q) values) ? > > The server in question is a DELL R710 that comes as a poor choice on boug= ht (nobody notice the SATA disks until the server was installed - then it w= as too late for a exchange). > > It was a lot worse at beginning and adding the following lines (to /boot/= loader.conf) did help a little bit (it is usable now, even when it is fully= loaded by find requests - usable but not normal -). > > vfs.zfs.vdev.min_pending=3D1 > vfs.zfs.vdev.max_pending=3D1 > > Not sure if this will help with your hardware, but you can give it a try = if you're seeing high values for the L(q) column. Thanks for the tip but no, device queues are very short (1-2).
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