#pull disk, replace with new one
# you have to fail a disk before you remove it
# however, if the system wont release the raid partner, you need to slide the offending disks out and boot off a good disk.
#here you can review the layout
[root@host~]# fdisk -l /dev/sda
Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 16 128488+ fd Linux raid autodetect
/dev/sdb2 17 1291 10241437+ fd Linux raid autodetect
/dev/sdb3 1292 2566 10241437+ 83 Linux
/dev/sdb4 2567 30401 223584637+ 5 Extended
/dev/sdb5 2567 2827 2096451 fd Linux raid autodetect
/dev/sdb6 2828 2860 265041 fd Linux raid autodetect
/dev/sdb7 2861 30401 221223051 fd Linux raid autodetect
#review the descriptions of the disks
-----------
[root@host ~]# sfdisk -d /dev/sda
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 63, size= 256977, Id=fd, bootable
/dev/sda2 : start= 257040, size= 20482875, Id=fd
/dev/sda3 : start= 20739915, size= 20482875, Id=83
/dev/sda4 : start= 41222790, size=449113140, Id= 5
/dev/sda5 : start= 41222853, size= 4192902, Id=fd
/dev/sda6 : start= 45415818, size= 530082, Id=fd
/dev/sda7 : start= 45945963, size=444389967, Id=fd
[root@host ~]# sfdisk -d /dev/sdb
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/sdb: unrecognized partition table type
No partitions found
-----------
#this command is similar to `sfdisk -l`, but you can use it to copy the layout to the new replacement disk
#its destructive to sdb, be sure you know what you're doing. read man page, right? :)
-----------
[root@host~]# sfdisk -d /dev/sda | sfdisk /dev/sdb
Checking that no-one is using this disk right now ...
OK
Disk /dev/sdb: 30522 cylinders, 255 heads, 63 sectors/track
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/sdb: unrecognized partition table type
Old situation:
No partitions found
New situation:
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/sdb1 * 63 257039 256977 fd Linux raid autodetect
/dev/sdb2 257040 20739914 20482875 fd Linux raid autodetect
/dev/sdb3 20739915 41222789 20482875 83 Linux
/dev/sdb4 41222790 490335929 449113140 5 Extended
/dev/sdb5 41222853 45415754 4192902 fd Linux raid autodetect
/dev/sdb6 45415818 45945899 530082 fd Linux raid autodetect
/dev/sdb7 45945963 490335929 444389967 fd Linux raid autodetect
Successfully wrote the new partition table
Re-reading the partition table ...
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
[root@host~]# sfdisk -d /dev/sdb
# partition table of /dev/sdb
unit: sectors
/dev/sdb1 : start= 63, size= 256977, Id=fd, bootable
/dev/sdb2 : start= 257040, size= 20482875, Id=fd
/dev/sdb3 : start= 20739915, size= 20482875, Id=83
/dev/sdb4 : start= 41222790, size=449113140, Id= 5
/dev/sdb5 : start= 41222853, size= 4192902, Id=fd
/dev/sdb6 : start= 45415818, size= 530082, Id=fd
/dev/sdb7 : start= 45945963, size=444389967, Id=fd
-----------
#check the status of the set
cat /proc/mdstat
#now, add the partition slices back to the set
mdadm --add /dev/md0 /dev/sdb1
mdadm --add /dev/md1 /dev/sdb5
mdadm --add /dev/md3 /dev/sdb6
mdadm --add /dev/md4 /dev/sdb7
mdadm --add /dev/md2 /dev/sdb2
#review
mdadm --detail /dev/md0
#review progress
cat /proc/mdstat
healthy output:
[root@host ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0] sdb1[1]
128384 blocks [2/2] [UU]
md1 : active raid1 sda5[0] sdb5[1]
2096384 blocks [2/2] [UU]
md3 : active raid1 sda6[0] sdb6[1]
264960 blocks [2/2] [UU]
md4 : active raid1 sda7[0] sdb7[1]
221222976 blocks [2/2] [UU]
md2 : active raid1 sda2[0] sdb2[1]
10241344 blocks [2/2] [UU]
unused devices:
UNhealthy output:
[root@host ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1]
128384 blocks [2/2] [_U]
md1 : active raid1 sdb5[1]
2096384 blocks [2/2] [_U]
md3 : active raid1 sdb6[1]
264960 blocks [2/2] [_U]
md4 : active raid1 sdb7[1]
221222976 blocks [2/2] [_U]
md2 : active raid1 sdb2[1]
10241344 blocks [2/2] [_U]
unused devices:
#have a nice day
--------------------------------------------------------
[root@somehost ~]# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Sat Oct 31 03:08:47 2009
Raid Level : raid1
Array Size : 128384 (125.40 MiB 131.47 MB)
Device Size : 128384 (125.40 MiB 131.47 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Jul 25 04:48:26 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : xxxxxx:xxxxxxxx:xxxxxxx:dd7a13a5
Events : 0.74
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
--------------------------------------------------------
nagios check: check_by_ssh!"sudo /bin/cat /proc/mdstat | grep _ /proc/mdstat -c | grep 0 -c
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