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- hoferr@media-server:~$ sudo mdadm --detail /dev/md0
- /dev/md0:
- Version : 0.90
- Creation Time : Wed Dec 22 02:13:21 2010
- Raid Level : raid5
- Array Size : 4395411264 (4191.79 GiB 4500.90 GB)
- Used Dev Size : 1465137088 (1397.26 GiB 1500.30 GB)
- Raid Devices : 4
- Total Devices : 4
- Preferred Minor : 0
- Persistence : Superblock is persistent
- Update Time : Wed Apr 18 11:16:32 2012
- State : clean
- Active Devices : 4
- Working Devices : 4
- Failed Devices : 0
- Spare Devices : 0
- Layout : left-symmetric
- Chunk Size : 64K
- UUID : 426c0b3a:41ce01ea:d14afcea:0399e8b7
- Events : 0.48731
- Number Major Minor RaidDevice State
- 0 8 49 0 active sync /dev/sdd1
- 1 8 65 1 active sync /dev/sde1
- 2 8 17 2 active sync /dev/sdb1
- 3 8 33 3 active sync /dev/sdc1
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sdd
- mdadm: Couldn't open /dev/sdd for write - not zeroing
- hoferr@media-server:~$ sudo mdadm --stop /dev/md0
- mdadm: stopped /dev/md0
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sdd
- mdadm: Unrecognised md component device - /dev/sdd
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sdd1
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sde1
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sdb1
- hoferr@media-server:~$ sudo mdadm --zero-superblock /dev/sdc1
- hoferr@media-server:~$ sudo mdadm --create --verbose /dev/md0 --auto=yes --assume-clean --level=5 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
- mdadm: layout defaults to left-symmetric
- mdadm: chunk size defaults to 512K
- mdadm: layout defaults to left-symmetric
- mdadm: layout defaults to left-symmetric
- mdadm: layout defaults to left-symmetric
- mdadm: layout defaults to left-symmetric
- mdadm: layout defaults to left-symmetric
- mdadm: size set to 1465135616K
- mdadm: Defaulting to version 1.2 metadata
- mdadm: array /dev/md0 started.
- hoferr@media-server:~$ sudo mdadm --assemble /dev/md0 --update=resync
- hoferr@media-server:~$ sudo mdadm --detail /dev/md0
- /dev/md0:
- Version : 1.2
- Creation Time : Wed Apr 18 16:07:12 2012
- Raid Level : raid5
- Array Size : 4395406848 (4191.79 GiB 4500.90 GB)
- Used Dev Size : 1465135616 (1397.26 GiB 1500.30 GB)
- Raid Devices : 4
- Total Devices : 4
- Persistence : Superblock is persistent
- Update Time : Wed Apr 18 16:07:12 2012
- State : clean
- Active Devices : 4
- Working Devices : 4
- Failed Devices : 0
- Spare Devices : 0
- Layout : left-symmetric
- Chunk Size : 512K
- Name : media-server:0 (local to host media-server)
- UUID : a6c5c588:47d9ce20:7cc3ca49:0d0bc7db
- Events : 0
- Number Major Minor RaidDevice State
- 0 8 17 0 active sync /dev/sdb1
- 1 8 33 1 active sync /dev/sdc1
- 2 8 49 2 active sync /dev/sdd1
- 3 8 65 3 active sync /dev/sde1
- hoferr@media-server:~$ sudo mount /dev/md0 test/
- mount: you must specify the filesystem type
- hoferr@media-server:~$ sudo mount -tjfs /dev/md0 test/
- mount: wrong fs type, bad option, bad superblock on /dev/md0,
- missing codepage or helper program, or other error
- In some cases useful info is found in syslog - try
- dmesg | tail or so
- hoferr@media-server:~$ dmesg | tail
- [ 1211.116702] mdadm: sending ioctl 1261 to a partition!
- [ 1211.116707] mdadm: sending ioctl 1261 to a partition!
- [ 1322.605543] mdadm: sending ioctl 1261 to a partition!
- [ 1322.605549] mdadm: sending ioctl 1261 to a partition!
- [ 1381.917490] mdadm: sending ioctl 800c0910 to a partition!
- [ 1381.917495] mdadm: sending ioctl 800c0910 to a partition!
- [ 1381.917662] mdadm: sending ioctl 800c0910 to a partition!
- [ 1381.917668] mdadm: sending ioctl 800c0910 to a partition!
- [ 1385.126808] mdadm: sending ioctl 1261 to a partition!
- [ 1385.126814] mdadm: sending ioctl 1261 to a partition!
- hoferr@media-server:~$ sudo fdisk -l /dev/md0
- Disk /dev/md0: 4500.9 GB, 4500896612352 bytes
- 2 heads, 4 sectors/track, 1098851712 cylinders
- Units = cylinders of 8 * 512 = 4096 bytes
- Sector size (logical/physical): 512 bytes / 512 bytes
- I/O size (minimum/optimal): 524288 bytes / 1572864 bytes
- Disk identifier: 0x00000000
- Disk /dev/md0 doesn't contain a valid partition table
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