False alarm. My apologies. There was a stale superblock on the disk I was trying to hot add as a spare. Once I wiped the superblock it was successfully added to the array. That being said, the error message issued wasn't exactly appropriate. Regards, Sean ----- Original Message ---- From: Sean Puttergill <puttergi@xxxxxxxx> To: neilb@xxxxxxx Cc: linux-raid@xxxxxxxxxxxxxxx Sent: Wednesday, January 31, 2007 10:58:23 AM Subject: Hot add not supported by version 1.x superblocks? Hello Neil. I have a RAID1 built using v1.2 superblocks. I seem to not be able to hot add a spare drive to this array. I get the error message: "HOT_ADD may only be used with version-0 superblocks" Does this really mean that hot add is not supported for arrays built with v1.x superblocks? If so this seems like a big regression in functionality. In this case, are there technical reasons why v1.x cannot support hot add? I am using a stock 2.6.18 kernel with mdadm v2.5.4 Thanks, Sean __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - 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 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - 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