On Wed, 29 Oct 2008 17:58:56 -0400, Hal Vaughan wrote: > On Wednesday 29 October 2008, Hendrik Boom wrote: >> >> I'm a bit surprised that none of the messages identifies the other >> drive, /dev/hdc3. Is this normal? Is that information available >> somewhere besides the sysadmin's memory? > > Luckily it's been at least a couple months since I worked with a > degraded array, but I *thought* it listed the failed devices as well. It > looks like the device has not only failed but been removed -- is there a > chance you removed it after the failure, before running this command?
No. I did not explicitly fail it or remove it. There must have been some automatic mechanism that did. >> >> So presumably the thing to do is >> mdadm --fail /dev/md0 /dev/hdc3 >> mdadm --remove /dev/md0 /dev/hdc3 >> and then >> mdadm --add/dev/md0 /dev/hdc3 > > I think there's a "--readd" that you have to use or something like that, > but I'd try --add first and see if that works. You might find that hdc3 > has already failed and, form the output above, looks like it's already > been removed. In the docs, re-add is specified as something to use if a drive has been removed *recently*, and then it writes all the blocks that were to have been written while it was out -- a way of doing an update instead of s full copy. It doesn't seem relevant in this case. > >> Is the --fail really needed in my case? the --detail option seems to >> have given /dev/hdc3 the status of "removed" (although it failed to >> mention is was /dev/hdc3). > > I've had trouble with removing drives if I didn't manually fail them. > Someone who knows the inner workings of mdadm might be able to provide > more information on that. I wonder if /dev/hdc3 still needs to be manually failed. I wonder if it is even possible to fail a removed drive... > > Yes, paranoia is a good thing in system administration. It's kept me > from severe problems previously! And paranoia will make sure I have two complete backups before I actually do any of this fixup. - hendrik > > > Hal -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
