Messages in this thread | | | From | "Ju, Seokmann" <> | Subject | RE: Slow I/O with megaraid and u160 scsi jbod | Date | Mon, 29 Aug 2005 15:03:43 -0400 |
| |
Hi,
> formatted the disks in question with a single JFS partition and they > still exhibit this behaviour when used by themselves. I have verified > that this behaviour is not present up until at least 2.6.12.3. Let me > know what info I can collect that would be helpful.. Thanks. Can you please specify following? - driver version on 2.6.12.3 - F/W version on the controller you are using.
Thank you.
> -----Original Message----- > From: Phil Dier [mailto:phil@icglink.com] > Sent: Monday, August 29, 2005 2:14 PM > To: linux-kernel@vger.kernel.org > Cc: Scott Holdren; ziggy; Jack Massari > Subject: Slow I/O with megaraid and u160 scsi jbod > > Hi, > > I've had luck with this patch[1] (it at least eliminated the oopses > I was getting), but now I'm having a different sort of problem with > my setup[2] (the 2.6.13 release exhibits this behaviour as well). I > have 2 u160 scsi jbods connected to this machine[3]. One is connected > to an Adaptec card, and the other is connected to the Fusion MPT card > (megaraid). All of the disks connected to the Adaptec card work fine, > but when doing I/O on disks 2 and 3 on the megaraid card, it stalls > considerably. When trying to sync a RAID1 device using the 4 148GB > disks, the sync speed never goes above 2KB/s. When they finally get > synched, IO stalls constantly. Watching with iostat confirms > this. I've > formatted the disks in question with a single JFS partition and they > still exhibit this behaviour when used by themselves. I have verified > that this behaviour is not present up until at least 2.6.12.3. Let me > know what info I can collect that would be helpful.. Thanks. > > > > [1] http://www.ussg.iu.edu/hypermail/linux/kernel/0508.1/1952.html > [2] http://www.icglink.com/debug-2.6.13-rc6.html > [3] Diagram: > > +---------+ > | Adaptec | > +---------+ > | > +-------+-------+-------+-------+-------+ > | id: 0 | id: 1 | id: 2 | id: 3 | id: 4 | > | 73GB | 73GB | 148GB | 148GB | 73GB | > +-------+-------+-------+-------+-------+ > > +----------+ > | megaraid | > +----------+ > | > +-------+-------+-------+-------+-------+ > | id: 0 | id: 1 | id: 2 | id: 3 | id: 4 | > | 73GB | 73GB | 148GB | 148GB | 73GB | > +-------+-------+-------+-------+-------+ > > -- > > Phil Dier (ICGLink.com -- 615 370-1530 x733) > > /* vim:set noai nocindent ts=8 sw=8: */ > - > To unsubscribe from this list: send the line "unsubscribe > linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |