2007/7/4, Mark Lord <liml@xxxxxx>:
Tejun Heo wrote: > Mark Lord wrote: >> I believe he said it was ICH5 (different post/thread). >> >> My observation on ICH5 is that if one unplugs a drive, >> then the chipset/cpu locks up hard when toggling SRST >> in the EH code. >> >> Specifically, it locks up at the instruction >> which restores SRST back to the non-asserted state, >> which likely corresponds to the chipset finally actually >> sending a FIS to the drive. >> >> A hard(ware) lockup, not software. >> That's why Intel says ICH5 doesn't do hotplug. > > OIC. I don't think there's much left to do from the driver side then. > Or is there any workaround? The workaround I have, for 2.6.18.8, is to provide an "offline()" method for ICH5 that polls for device present before attempting SRST. I hope to eventually clean this up and submit it for you, after your existing polling-hp code goes upstream. Here's my present hack (below). Feel free to use/ignore. *** Implement ICH5 chipset handling for drive hot insertion/removal. This cannot go upstream, as it conflicts with a more generic polled-hotplug framework that is currently in development. Hot-inserted drives are automatically detected within a second or two, and are ready-to-use within 30 seconds or so. Hot-removed drives are *not* noticed by the kernel until the next time they are accessed. If you want this to happen quickly, then just launch a script like this from /etc/inittab at boot time: #!/bin/bash ( while ( /bin/true ) ; do /sbin/hdparm -C /dev/sd[a-z] ; sleep 5 ; done ) &>/dev/null & Signed-off-by: Mark Lord <mlord@xxxxxxxxx> ---
Hello, Thanks this patch work in my case after unplug-in my hard drive. But the situation is strange. The first time it functioned fine and i get this messages : [ 290.452296] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen [ 290.452378] ata2.00: tag 0 cmd 0xea Emask 0x4 stat 0x40 err 0x0 (timeout) [ 290.452635] ata2 (port 1): status=d0 pcs=0x0013 offline=1 delay=100 usecs [ 290.452697] ata2: soft resetting port [ 290.452787] ata2: SATA link down (SStatus 0 SControl 0) [ 290.463065] ATA: abnormal status 0x7F on port 0xCCA7 [ 290.463154] ata2: EH complete [ 290.463224] sd 1:0:0:0: SCSI error: return code = 0x00040000 [ 290.463286] end_request: I/O error, dev sdb, sector 156248058 [ 290.463362] raid1: Disk failure on sdb2, disabling device. [ 290.463365] Operation continuing on 1 devices [ 290.465590] RAID1 conf printout: [ 290.465651] --- wd:1 rd:2 [ 290.465710] disk 0, wo:0, o:1, dev:sda3 [ 290.465767] disk 1, wo:1, o:0, dev:sdb2 [ 290.480225] RAID1 conf printout: [ 290.480281] --- wd:1 rd:2 [ 290.480370] disk 0, wo:0, o:1, dev:sda3 [ 290.619960] ata2: pcs_hotplug_poll: old=0033 new=0013 [ 290.620045] ata2: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0x2 frozen [ 290.620114] ata2: (hotplug event) [ 290.620178] ata2: soft resetting port [ 290.620242] ata2: SATA link down (SStatus 0 SControl 0) [ 290.630518] ATA: abnormal status 0x7F on port 0xCCA7 [ 290.630588] ata2: EH complete [ 290.630652] ata2.00: detaching (SCSI 1:0:0:0) But with a second try when i unplug the disk (with the while loop in background task) the unplug function wad not started, i need to change the partition table with fdisk to get the disk offline : [ 397.764666] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen [ 397.770229] ata2.00: (BMDMA stat 0x21) [ 397.775771] ata2.00: tag 0 cmd 0xc8 Emask 0x4 stat 0x40 err 0x0 (timeout) [ 397.781502] ata2 (port 1): status=d0 pcs=0x0013 offline=1 delay=100 usecs [ 397.787046] ata2: soft resetting port [ 397.792614] ata2: SATA link up <unknown> (SStatus 0 SControl 0) [ 397.808327] ATA: abnormal status 0x7F on port 0xCCA7 [ 397.813910] ata2: EH complete [ 397.819501] sd 1:0:0:0: SCSI error: return code = 0x00040000 [ 397.825049] end_request: I/O error, dev sdb, sector 32 [ 397.830613] Buffer I/O error on device sdb, logical block 4 [ 397.836177] Buffer I/O error on device sdb, logical block 5 [ 397.841748] Buffer I/O error on device sdb, logical block 6 [ 397.847315] Buffer I/O error on device sdb, logical block 7 [ 397.852874] Buffer I/O error on device sdb, logical block 8 [ 397.858440] Buffer I/O error on device sdb, logical block 9 [ 397.864021] Buffer I/O error on device sdb, logical block 10 [ 397.869579] Buffer I/O error on device sdb, logical block 11 [ 397.875177] sd 1:0:0:0: SCSI error: return code = 0x00040000 [ 397.880734] end_request: I/O error, dev sdb, sector 0 [ 397.886312] Buffer I/O error on device sdb, logical block 0 [ 397.891889] lost page write due to I/O error on sdb [ 398.283654] ata2: pcs_hotplug_poll: old=0033 new=0013 [ 398.289250] ata2: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0x2 frozen [ 398.294843] ata2: (hotplug event) [ 398.300433] ata2: soft resetting port [ 398.305997] ata2: SATA link up <unknown> (SStatus 0 SControl 0) [ 398.321732] ATA: abnormal status 0x7F on port 0xCCA7 [ 398.327329] ata2: EH complete [ 398.332904] ata2.00: detaching (SCSI 1:0:0:0) Before i do the change in the partition table my system was normal, and a fdisk -l /dev/sdb give me the right table (but my disk was disconnected ...). Thanks for paying attention of my problem :) - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
