On Sun, October 11, 2009 2:39 pm, Jon Lewis wrote: > I've got a CentOS 4.8 system running software RAID1 on an identical pair > of PATA drives. At some point in the recent past, the system rebooted > unexpectedly, and the two RAID1 devices degraded. When trying to > mdadm /dev/md0 -a /dev/hde1 > I get > mdadm: hot add failed for /dev/hde1: Invalid argument > and from the kernel, > md: could not bd_claim hde1. > md: error, md_import_device() returned -16 Either hde1 or hde is definitely in use by something else. Try: cat /proc/mounts cat /proc/swaps ls -l /sys/block/hde1/holders ls -l /sys/block/hde/holders cat /proc/mdstat lsof /dev/hde /dev/hde1 one of those should give some pointer. NeilBrown > > The same happens when trying to add hde3 back to md1. The googling I've > done suggests this is because something has these hde devices open. > They're not mounted. LVM is not in use. Nothing that I can find is using > these devices. The system has been properly shut down a number of times > since the arrays went degraded, but the errors we get when trying to readd > the missing devices has not changed. > > # mdadm --detail /dev/md0 > /dev/md0: > Version : 00.90.01 > Creation Time : Wed Mar 23 15:49:58 2005 > Raid Level : raid1 > Array Size : 38547840 (36.76 GiB 39.47 GB) > Device Size : 38547840 (36.76 GiB 39.47 GB) > Raid Devices : 2 > Total Devices : 1 > Preferred Minor : 0 > Persistence : Superblock is persistent > > Update Time : Sat Oct 10 23:31:50 2009 > State : clean, degraded > Active Devices : 1 > Working Devices : 1 > Failed Devices : 0 > Spare Devices : 0 > > Number Major Minor RaidDevice State > 0 0 0 -1 removed > 1 34 1 1 active sync /dev/hdg1 > UUID : e5f38941:e40733ec:4b761dd4:cdc8f141 > Events : 0.60067904 > > Short of booting from some form of rescue image, and trying to readd the > missing devices (and then waiting for synchronization before putting the > machine back in service) is there anything worth trying to get the arrays > back in sync? > > Disk /dev/hde: 80.0 GB, 80026361856 bytes > 255 heads, 63 sectors/track, 9729 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/hde1 * 1 4799 38547936 fd Linux raid > autodetect > /dev/hde2 4800 4930 1052257+ 82 Linux swap > /dev/hde3 4931 9729 38547967+ fd Linux raid > autodetect > > Disk /dev/hdg: 80.0 GB, 80026361856 bytes > 255 heads, 63 sectors/track, 9729 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/hdg1 * 1 4799 38547936 fd Linux raid > autodetect > /dev/hdg2 4800 4930 1052257+ 82 Linux swap > /dev/hdg3 4931 9729 38547967+ fd Linux raid > autodetect > > > ---------------------------------------------------------------------- > Jon Lewis | I route > Senior Network Engineer | therefore you are > Atlantic Net | > _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________ > -- > 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
