From: Lex <[email protected]> Date: Tue, Jan 26, 2010 at 2:12 PM Subject: Re: [Lustre-discuss] slow direct_io , slow journal .. in OST log To: Mark Hahn <[email protected]> Cc: Erik Froese <[email protected]>
There was a problem with our raid controller this morning, raid array was degraded ( I reinstalled the hard drive and its state was *rebuilding* right after that ) and from messages log, i saw many warnings like this: *Jan 26 13:59:13 OST6 kernel: Lustre: 9589:0:(filter.c:1363:filter_parent_lock()) lustre-OST0006: slow parent lock 49s Jan 26 13:59:13 OST6 kernel: Lustre: 9589:0:(filter.c:1363:filter_parent_lock()) Skipped 10 previous similar messages Jan 26 13:59:13 OST6 kernel: Lustre: 9638:0:(filter_io.c:398:filter_preprw_read()) lustre-OST0006: slow preprw_read setup 34s* I have never seen *slow parent lock *or *preprw-read *before. Maybe everything is going down fast and severely, Do all you guys have any ideas for my situation ? Just guess, i think it was impacted by performance decreasing issue during rebuild raid array. Best regards On Tue, Jan 26, 2010 at 9:05 AM, Lex <[email protected]> wrote: > > > On Tue, Jan 26, 2010 at 12:07 AM, Mark Hahn <[email protected]> wrote: > >> Sorry Erik if i'm rising such a "bad" question, could u tell me more >>> about >>> OST journal device ? I even don't know what it is as well as haven't seen >>> it >>> before, in the lustre manual. >>> >> >> an OST is an ext3-ish filesystem associated with some OST server >> processes. >> since it's basically ext3, the properties of ext3 apply, including the use >> of a journal, and the ability to use an "external" journal device. >> > > I think we don't have any separate or external journal device like you > said. So could anyone tell me exactly what stuff make the warning about slow > xxx in our OST logs like i described above is ? Is there any role of lustre > in this situation ? And how? What is the relationship with journal device > and my problem ? > > Best regards >
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