You must remove the bad disk first. mdadm -r /dev/md2 /dev/hda2 Then add the new disk: mdadm -a /dev/md2 /dev/hda2 Why are you using the obsolete raidtools which includes hot-add? Is red hat still using the old stuff? Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Konstantin Olchanski Sent: Monday, October 18, 2004 6:57 PM To: linux-raid@xxxxxxxxxxxxxxx Subject: Please help- raid1 recovery after disk failure Dear Linux raiders- I ran into a problem with raid1 recovery after a disk failure (running Fedora2, kernel 2.6.8-1.521smp). 1) I had a raid1 filesystem mirrored across /dev/hda2 and /dev/hdc2. 2) Disk hda died (unreadable sectors, fails SMART tests) 3) A new blank hda was installed and partitionned exactly like hdc. 4) I cannot restart and rebuild the raid1 volume because hdc2 is in a funny "spare" state (see below) How do I mark hdc2 as "active"? Once "active", I assume then I will be able to restart md0, hot-add /dev/hda2 as usual. (And the mirror will resync and rebuild itself? Hopefully?) [root@tw04 root]# mdadm -E /dev/hdc2 /dev/hdc2: Magic : a92b4efc Version : 00.90.00 UUID : aade8782:20122089:4f496788:228d85b9 Creation Time : Fri Oct 8 17:12:56 2004 Raid Level : raid1 Device Size : 124158208 (118.41 GiB 127.14 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Mon Oct 18 06:04:35 2004 State : clean, no-errors Active Devices : 1 Working Devices : 2 Failed Devices : 1 Spare Devices : 1 Checksum : 7041db42 - correct Events : 0.312429 Number Major Minor RaidDevice State this 2 22 2 2 spare /dev/hdc2 0 0 3 2 0 active sync /dev/hda2 1 1 0 0 1 faulty removed 2 2 22 2 2 spare /dev/hdc2 [root@tw04 root]# -- Konstantin Olchanski Data Acquisition Systems: The Bytes Must Flow! Email: olchansk-at-triumf-dot-ca Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada - 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 - 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
