I'm trying to create a RAID5 consisting of 4 3TB drives from scratch:
drives are western digital caviar green:
ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata6.00: ATA-8: WDC WD30EZRX-00MMMB0, 80.00A80, max UDMA/133
ata6.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 0/32)
ata6.00: configured for UDMA/133
- GPT partitions created with gdisk, type=FD00 (all 4 drives)
GPT fdisk (gdisk) version 0.6.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): p
Disk /dev/sdb: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 6AA3BE6A-D2F1-4124-91C2-F6A940893912
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)
Number Start (sector) End (sector) Size Code Name
1 2048 5860533134 2.7 TiB FD00 Linux RAID
- raid created using:
# mdadm --create /dev/md0 --level=5 --metadata=1.2 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
before that the raid was created without "--metadata=1.2", also didn't
work.
- on boot, dmesg says:
md: Autodetecting RAID arrays.
md: invalid raid superblock magic on sdb1
md: sdb1 has invalid sb, not importing!
md: invalid raid superblock magic on sdc1
md: sdc1 has invalid sb, not importing!
md: invalid raid superblock magic on sdd1
md: sdd1 has invalid sb, not importing!
md: invalid raid superblock magic on sde1
md: sde1 has invalid sb, not importing!
md: autorun ...
md: ... autorun DONE.
manually starting the array works:
# mdadm -A /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
distribution is CentOS 5
kernel is 2.6.18-308.13.1.el5 #1 SMP Tue Aug 21 17:10:18 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux
mdadm - v2.6.9 - 10th March 2009
]# mdadm --misc --detail /dev/md0
/dev/md0:
Version : 1.02
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Array Size : 8790796032 (8383.56 GiB 9001.78 GB)
Used Dev Size : 2930265344 (2794.52 GiB 3000.59 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Oct 22 15:31:35 2012
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 1% complete
Name : 0
UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Events : 2
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
4 8 65 3 spare rebuilding /dev/sde1
# mdadm --misc --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Name : 0
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860530815 (2794.52 GiB 3000.59 GB)
Array Size : 17581592064 (8383.56 GiB 9001.78 GB)
Used Dev Size : 5860530688 (2794.52 GiB 3000.59 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 52a595c7:6653dda4:552c9f60:18d599f2
Update Time : Mon Oct 22 15:31:35 2012
Checksum : d6779191 - correct
Events : 2
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 0 (0, 1, 2, failed, 3)
Array State : Uuuu 1 failed
# mdadm --misc --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Name : 0
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860530815 (2794.52 GiB 3000.59 GB)
Array Size : 17581592064 (8383.56 GiB 9001.78 GB)
Used Dev Size : 5860530688 (2794.52 GiB 3000.59 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 4123cbb0:d1277335:e3921bc6:364225d6
Update Time : Mon Oct 22 15:31:35 2012
Checksum : 994ab798 - correct
Events : 2
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 1 (0, 1, 2, failed, 3)
Array State : uUuu 1 failed
# mdadm --misc --examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Name : 0
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860530815 (2794.52 GiB 3000.59 GB)
Array Size : 17581592064 (8383.56 GiB 9001.78 GB)
Used Dev Size : 5860530688 (2794.52 GiB 3000.59 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 5368012a:ec82ec5f:cdb40a87:b8532e7a
Update Time : Mon Oct 22 15:31:35 2012
Checksum : a1f28b31 - correct
Events : 2
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 2 (0, 1, 2, failed, 3)
Array State : uuUu 1 failed
# mdadm --misc --examine /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x2
Array UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Name : 0
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860530815 (2794.52 GiB 3000.59 GB)
Array Size : 17581592064 (8383.56 GiB 9001.78 GB)
Used Dev Size : 5860530688 (2794.52 GiB 3000.59 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
Recovery Offset : 81916672 sectors
State : clean
Device UUID : a262c799:11903bf3:198e50f5:f978762b
Update Time : Mon Oct 22 15:31:35 2012
Checksum : c9778437 - correct
Events : 2
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 4 (0, 1, 2, failed, 3)
Array State : uuuU 1 failed
# mdadm --misc --examine /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x2
Array UUID : dae0c282:714e8425:18e57ac1:f66d33a8
Name : 0
Creation Time : Mon Oct 22 15:07:04 2012
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860530815 (2794.52 GiB 3000.59 GB)
Array Size : 17581592064 (8383.56 GiB 9001.78 GB)
Used Dev Size : 5860530688 (2794.52 GiB 3000.59 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
Recovery Offset : 81916672 sectors
State : clean
Device UUID : a262c799:11903bf3:198e50f5:f978762b
Update Time : Mon Oct 22 15:31:35 2012
Checksum : c9778437 - correct
Events : 2
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 4 (0, 1, 2, failed, 3)
Array State : uuuU 1 failed
there's something I'm missing here - please advise.
thnx.
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