> >Thank you both for your replies. > > > >First off all the hardware (both server and disks) does support hot > >swap. And I have tried on three different machines (same model) to rule > >out a hardware fault. > > > >I have never had any problems with hot swap before. And indeed hot swap > >on these machines work with the 2.6.15.7 kernel. But something has > >changed since 2.6.16 so it no longer works. > > > Hmm. But you should see something in the logs for 2.6.15, too. > Ideally some aic79xx stack dump. Can you dig it out? > If a aic79xx state dump is available for 2.6.15 we might be able to > figure out the difference and fix the driver if possible. No stack dump is logged and I don't know how to force one. After echoing "scsi remove-single-device 1 0 2 0" to /proc/scsi/scsi nothing is logged. After the disk is physically removed from its bay this is logged: Aug 31 12:45:58 nyimf kernel: scsi1: Someone reset channel A And when it's re-inserted: Aug 31 12:46:24 nyimf kernel: scsi1: Someone reset channel A After echoing "scsi add-single-device 1 0 2 0" to /proc/scsi/scsi the disk is detected and ready to use: Aug 31 12:46:45 nyimf kernel: Vendor: IBM-ESXS Model: VPR036C3-ETS10FN Rev: S3C0 Aug 31 12:46:45 nyimf kernel: Type: Direct-Access ANSI SCSI revision: 04 Aug 31 12:46:45 nyimf kernel: target1:0:2: asynchronous. Aug 31 12:46:45 nyimf kernel: scsi1:A:2:0: Tagged Queuing enabled. Depth 32 Aug 31 12:46:45 nyimf kernel: target1:0:2: Beginning Domain Validation Aug 31 12:46:45 nyimf kernel: target1:0:2: wide asynchronous. Aug 31 12:46:45 nyimf kernel: target1:0:2: FAST-160 WIDE SCSI 320.0 MB/s DT IU RDSTRM RTI WRFLOW PCOMP (6.25 ns, offset 127) Aug 31 12:46:45 nyimf kernel: target1:0:2: Domain Validation skipping write tests Aug 31 12:46:45 nyimf kernel: target1:0:2: Ending Domain Validation Aug 31 12:46:49 nyimf udevd-event[20583]: wait_for_sysfs: waiting for '/sys/devices/pci0000:00/0000:00:06.0/0000:07:00.0/0000:08:07.1/host1/target1:0:2/1:0:2:0/bus' failed Aug 31 12:46:52 nyimf udevd-event[20583]: wait_for_sysfs: waiting for '/sys/devices/pci0000:00/0000:00:06.0/0000:07:00.0/0000:08:07.1/host1/target1:0:2/1:0:2:0/ioerr_cnt' failed Aug 31 12:46:54 nyimf kernel: sdc: Spinning up disk............ready Aug 31 12:46:54 nyimf kernel: SCSI device sdc: 71096640 512-byte hdwr sectors (36401 MB) Aug 31 12:46:54 nyimf kernel: SCSI device sdc: drive cache: write through Aug 31 12:46:54 nyimf kernel: SCSI device sdc: 71096640 512-byte hdwr sectors (36401 MB) Aug 31 12:46:54 nyimf scsi_id[20586]: scsi_id: unable to access parent device of '/block/sdc' Aug 31 12:46:54 nyimf kernel: SCSI device sdc: drive cache: write through Aug 31 12:46:54 nyimf scsi_id[20587]: scsi_id: unable to access parent device of '/block/sdc' Aug 31 12:46:54 nyimf kernel: sdc: Aug 31 12:46:54 nyimf kernel: sd 1:0:2:0: Attached scsi disk sdc Aug 31 12:46:54 nyimf kernel: sd 1:0:2:0: Attached scsi generic sg2 type 0 > But saying that 'hotswap is supported' simply doesn't cut it. > The spec actually allows you to claim 'hotswap is supported' when you > have to power-cycle the entire cabinet. > Or the HBA. I don't think IBM designed the server that way. But I must admit to knowing very little about scsi. It just seemed suspicious that hot swapping stopped working with 2.6.16 when the changelog showed a lot of changes to the aic79xx driver. Sincerely, Martin Zuziak <zuziak@xxxxxxxxxx> - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
