Hi there I'm having trouble with raidhotremove. I'm using kernel 2.4.18 and raidtools 0.90. # raidhotremove /dev/md0 /dev/sda5 /dev/md0: can not hot-remove disk: disk busy! This is despite the fact that md0 is not mounted (and there are no other md devices running which might have been using other partitions on the same disk). In addition, I usually also get a weird message: ------------------------------------ md: bug in file md.c, line 2341 followed by a <COMPLETE RAID STATE PRINTOUT> and then: md: cannot remove active disk sda5 from md0 ... ------------------------------------ All of this message goes to the console rather than stdout or stderr. So I'm baffled! What am I doing wrong? I'm interested in getting raidhotremove to work to try to be able to deal with badblocks on my scsi disks. The accepted wisdom (see http://linas.org/linux/raid.html) seems to be that this can't be done: "Another serious drawback of this RAID+LVM combo is that neither Linux Software RAID (MD) nor LVM have any sort of bad-block replacement mechanisms. If (or rather, when) disks start manifesting bad blocks, one is up a creak without a paddle." But why should the following prescription _not_ work: Start with md0 using sda5 and sdb5 and say sda5 develops a bad block (this is actually happening to me so it's not just an academic concern ;-() First remove the bad partition from the array (if it has not already been booted out): raidhotremove /dev/md0 /dev/sda5 Then badblock the partition: badblocks /dev/sda5 > bblist Unmount the md device if mounted: umount /dev/md0 Add the badblocks to the filesystem: e2fsck -l bblist /dev/md0 Finally, add the disk back in to the array: raidhotadd /dev/md0 /dev/sda5 I can't see why that shouldn't work? Of course, if a badblock has been detected which lies beyond the fs i.e. in the raid superblock, then you've had it. (This will be obvious because the block will be rejected by the e2fsck as being out of range.) I've seen mention on this list of a low level scsi formatting utility (scsiformat) for remapping bad blocks but I don't seem to have it on my RH7.1 system. Can anyone tell me where I can find it (preferably the source)? Comments greatly appreciated! TIA *************************************************** John Sutton SCL Internet URL http://www.scl.co.uk/ Tel. +44 (0) 1239 711 888 *************************************************** - 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
