Guys, > I see the same behavior (you didn't say what error messages were in your > log) -- I get a random disk that pops out every once in a while. Mine's Here's the detailed error message: scsi0: ERROR on channel 0, id 12, lun 0, CDB: Read (10) 00 01 b4 cd 3d 00 00 08 00 Info fld=0x1b4cd3d, Current sd08:19: sense key Medium Error Additional sense indicates Unrecovered read error I/O error: dev 08:19, sector 12850344 raid1: Disk failure on sdb9, disabling device. Operation continuing on 1 devices raid1: sdb9: rescheduling block 12850344 dirty sb detected, updating. md: updating md4 RAID superblock on device (skipping faulty sdb9 ) sda9 [events: 00000054](write) sda9's sb offset: 10032448 md: recovery thread got woken up ... md4: no spare disk to reconstruct array! -- continuing in degraded mode md: recovery thread finished ... . raid1: sda9: redirecting sector 12850344 to another mirror scsi0: ERROR on channel 0, id 12, lun 0, CDB: Read (10) 00 01 b4 cd 4d 00 00 08 00 Info fld=0x1b4cd50, Current sd08:19: sense key Medium Error Additional sense indicates Unrecovered read error I/O error: dev 08:19, sector 12850360 raid1: sdb9: rescheduling block 12850360 md: recovery thread got woken up ... md4: no spare disk to reconstruct array! -- continuing in degraded mode md: recovery thread finished ... raid1: sda9: redirecting sector 12850360 to another mirror Adapter Configuration: SCSI Adapter: Adaptec AIC-7892 Ultra 160/m SCSI host adapter Ultra-160/m LVD/SE Wide Controller at PCI 0/9/0 PCI MMAPed I/O Base: 0xed000000 [...] [rfu@appone aic7xxx]$ uname -a Linux appone 2.4.3-12smp #1 SMP Fri Jun 8 14:38:50 EDT 2001 i686 unknown distribution is RedHat 7.1 meanwhile I encountered another strange thing related to this: at home I've got a rather old ASUS socket7 EISA dual board (T55P2D4-Dual). I installed RedHat 7.1 on a different board (T55P2D4, no dual) on an old 2 GIG IDE disk, moved the disk to the dual board, tried to install the SMP kernel and got the same error: copy big file (about 12 Megs), diff both (original and copy) and they are different :-( the only common thing in this case is RedHat 7.1 !? regards, rainer. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html