Date: Tue, 31 Oct 2006 14:10:03 -0600 From: Eric Anderson <anderson@centtech.com> To: "Rick C. Petty" <rick@kiwi-computer.com> Cc: freebsd-geom@freebsd.org Subject: Re: burnt again by gmirror Message-ID: <4547AD9B.5050503@centtech.com> In-Reply-To: <20061031195442.GA55478@keira.kiwi-computer.com> References: <20061031195442.GA55478@keira.kiwi-computer.com>
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On 10/31/06 13:54, Rick C. Petty wrote: > A few days ago, one of my machines rebooted (6.2-PRERELEASE). It's using > gmirror, two SATA disks of equal model/size: ad4 & ad8. Today I noticed > ad4 was loaded and ad8 said 0% (using systat). I tried: > > # gmirror status > Name Status Components > mirror/gm0 DEGRADED ad4 > > # gmirror list > Geom name: gm0 > State: DEGRADED > Components: 2 > Balance: round-robin > Slice: 4096 > Flags: NONE > GenID: 1 > SyncID: 4 > ID: 793566958 > Providers: > 1. Name: mirror/gm0 > Mediasize: 320072932864 (298G) > Sectorsize: 512 > Mode: r7w6e8 > Consumers: > 1. Name: ad4 > Mediasize: 320072933376 (298G) > Sectorsize: 512 > Mode: r1w1e1 > State: ACTIVE > Priority: 0 > Flags: DIRTY > GenID: 1 > SyncID: 4 > ID: 3554825454 > > and noticed ad8 is not listed. Wonderful. A quick check that ad8 is > indeed present: > > # atacontrol list > ATA channel 0: > Master: no device present > Slave: no device present > ATA channel 1: > Master: acd0 <16X8 DVD DUAL/A070> ATA/ATAPI revision 5 > Slave: no device present > ATA channel 2: > Master: ad4 <WDC WD3200KS-00PFB0/21.00M21> Serial ATA II > Slave: no device present > ATA channel 3: > Master: no device present > Slave: no device present > ATA channel 4: > Master: ad8 <WDC WD3200KS-00PFB0/21.00M21> Serial ATA II > Slave: no device present > ATA channel 5: > Master: no device present > Slave: no device present > > # atacontrol reinit ata4 > Master: ad8 <WDC WD3200KS-00PFB0/21.00M21> Serial ATA II > Slave: no device present > > As expected, but reiniting the channel doesn't attach ad8 to the mirror, > because the disk is already there. So I tried detach/attach of ata4 and > noticed this in dmesg: > > kernel: subdisk8: detached > kernel: ad8: detached > kernel: ad8: 305245MB <WDC WD3200KS-00PFB0 21.00M21> at ata4-master SATA300 > GEOM_MIRROR: Component ad8 (device gm0) broken, skipping. > GEOM_MIRROR: Cannot add disk ad8 to gm0 (error=22). > > I tried a few more things: > > # gmirror rebuild gm0 ad8 > No such provider: ad8. > > # gmirror insert gm0 ad8 > Not all disks connected. > > # gmirror activate gm0 ad8 > > (in dmesg, the same GEOM_MIRROR errors showed up). What is going on here? > This was working just fine until my last reboot. /var/run/dmesg.boot was > empty, presumably because the msg buffer overran itself. The error > messages are misleading (assuming they are even remotely correct) and quite > unhelpful. Why didn't gmirror pick up the ad8 provider on startup? Why > does it think there's another, unconnected disk (which makes sense) but > doesn't allow it to be re-attached? Is there any way to have gmirror > consume the ad8 provider? You probably need to do a gmirror forget, then a gmirror remove (on ad8), then re-insert it. gmirror probably kicked it out because of errors? Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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