Doh! Thanks for your help Neil. It seems that /dev/sdb1 was not cleanly unmounted (I'm not sure how that is since it only gets mounted once it's failed from /dev/md1 and I cleanly unmount it in my script). It just needed an fsck. We had some downtime today while our switch was being worked on so I rebooted the box and that didn't fix the issue. I stopped /dev/md1 and ran e2fsck on /dev/sdb1 and there were lots of fixes that needed to be done. Once the fsck was complete, I restarted /dev/md1 and all was well. I guess one should never overlook the obvious :) Off RAID topic but may be related to my issue, does anyone know how to remove an e2label from a disk device once it's been applied? I've searched around and can't find any information on how to accomplish this seemingly simple task. Thanks again for your help. Regards, Andy. -----Original Message----- From: Neil Brown [mailto:neilb@cse.unsw.edu.au] Sent: Sunday, February 17, 2002 5:41 AM To: Rechenberg, Andrew Cc: 'linux-raid@vger.kernel.org'; Banasik, Bob; 'arechenberg@cinshrcub01.shermfin.com' Subject: Re: RAID1 array not actively mirroring On Friday February 15, arechenberg@shermfin.com wrote: > Hi, > > I have a bit of a problem with my RAID1 mirror set. The RAID1 set is not > actively mirroring for some reason. This is all extremely wierd.... so there must be some critical piece of information that is missing.... I wonder what it is. You do still have "/dev/md1" mounted, rather than "/dev/md0", don't you? Have you tried rebooting, or is this impractical? The procedure that you describe sounds like it should work fine. Out of curiosity, what filesystem are you using? Do you need to fsck the /dev/sdb1 filesystem before mounting? NeilBrown - 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