[zfs-discuss] Re: System pause peculiarity with mysql on zfs
This does look like the ATA driver bug rather than a ZFS issue per se. (For the curious, the reason ZFS triggers this when UFS doesn't is because ZFS sends a synchronize cache command to the disk, which is not handled in DMA mode by the controller; and for this particular controller, switching between DMA and PIO mode has some quirks which were worked around by adding delays. The fix involves a new quirk-work-around.) Anton This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: System pause peculiarity with mysql on zfs
That's gotta be what it is. All our MySQL IOP issues have gone away one we moved to RAID-1 from RAID-Z. -J On 12/7/06, Anton B. Rang <[EMAIL PROTECTED]> wrote: This does look like the ATA driver bug rather than a ZFS issue per se. (For the curious, the reason ZFS triggers this when UFS doesn't is because ZFS sends a synchronize cache command to the disk, which is not handled in DMA mode by the controller; and for this particular controller, switching between DMA and PIO mode has some quirks which were worked around by adding delays. The fix involves a new quirk-work-around.) Anton This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: System pause peculiarity with mysql on zfs
On Dec 7, 2006, at 6:14 PM, Anton B. Rang wrote: This does look like the ATA driver bug rather than a ZFS issue per se. Yes indeed. Well, that answers that. FWIW, I'm hour 2 of a mysql configure script run. Yow! (For the curious, the reason ZFS triggers this when UFS doesn't is because ZFS sends a synchronize cache command to the disk, which is not handled in DMA mode by the controller; and for this particular controller, switching between DMA and PIO mode has some quirks which were worked around by adding delays. The fix involves a new quirk-work-around.) Ah, so I suppose this would affect the V100, too. The same ALi IDE controller in that box. Thanks for the insight. Since the fix for this made it into snv_52, I suppose it's too recent for a backport and patch release for s10 :( /dale ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: System pause peculiarity with mysql on zfs
Hi Dale, For what its worth, the SX releases tend to be pretty stable. I'm not sure if snv_52 has made a SX release yet. We ran for over 6 months on SX 10/05 (snv_23) with no downtime. Best Regards, Jason On 12/7/06, Dale Ghent <[EMAIL PROTECTED]> wrote: On Dec 7, 2006, at 6:14 PM, Anton B. Rang wrote: > This does look like the ATA driver bug rather than a ZFS issue per se. Yes indeed. Well, that answers that. FWIW, I'm hour 2 of a mysql configure script run. Yow! > (For the curious, the reason ZFS triggers this when UFS doesn't is > because ZFS sends a synchronize cache command to the disk, which is > not handled in DMA mode by the controller; and for this particular > controller, switching between DMA and PIO mode has some quirks > which were worked around by adding delays. The fix involves a new > quirk-work-around.) Ah, so I suppose this would affect the V100, too. The same ALi IDE controller in that box. Thanks for the insight. Since the fix for this made it into snv_52, I suppose it's too recent for a backport and patch release for s10 :( /dale ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
