Hello,
I'm trying to set up a large array but isn't working. I tried
Googling size limits, etc and came up empty.
The problem is that with 10 drives (300GB SCSI), the array is coming up
with 500GB of space?!? I did an experiment and when the array size
exceeds 2TB, it fails/wraps?
Is there a solution (simple or otherwise) for this? The machine runs
2.6.29.5 (anything later causes the machine to lock up :( ). I'm not
sure if mdadm or the kernel is the problem either.
Any suggestions appreciated (please CC me on replies).
Michael
-----
Here's the details:
]# mdadm --stop /dev/md1;mdadm --zero-superblock /dev/sd[a-j]1;mdadm --
create --level=5 --raid-devices=6 --assume-clean --auto=yes --force
/dev/md1 /dev/sd[a-f]1;mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Fri Jan 1 14:15:42 2010
Raid Level : raid5
Array Size : 1464841600 (1396.98 GiB 1500.00 GB)
Used Dev Size : 292968320 (279.40 GiB 300.00 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Jan 1 14:15:42 2010
State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : f6351ed0:cc1a90d1:0436ea62:f9d2db27
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 8 81 5 active sync /dev/sdf1
]# mdadm --stop /dev/md1;mdadm --zero-superblock /dev/sd[a-j]1;mdadm --
create --level=5 --raid-devices=7 --assume-clean --auto=yes --force
/dev/md1 /dev/sd[a-g]1;mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Fri Jan 1 14:16:00 2010
Raid Level : raid5
Array Size : 1757809920 (1676.38 GiB 1800.00 GB)
Used Dev Size : 292968320 (279.40 GiB 300.00 GB)
Raid Devices : 7
Total Devices : 7
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Jan 1 14:16:00 2010
State : clean
Active Devices : 7
Working Devices : 7
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 4116e7ac:522157c5:0436ea62:f9d2db27
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 8 81 5 active sync /dev/sdf1
6 8 97 6 active sync /dev/sdg1
]# mdadm --stop /dev/md1;mdadm --zero-superblock /dev/sd[a-j]1;mdadm --
create --level=5 --raid-devices=8 --assume-clean --auto=yes --force
/dev/md1 /dev/sd[a-h]1;mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Fri Jan 1 14:16:16 2010
Raid Level : raid5
Array Size : 2050778240 (1955.77 GiB 2100.00 GB)
Used Dev Size : 292968320 (279.40 GiB 300.00 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Jan 1 14:16:16 2010
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 9d271092:1a5fda10:0436ea62:f9d2db27
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 8 81 5 active sync /dev/sdf1
6 8 97 6 active sync /dev/sdg1
7 8 113 7 active sync /dev/sdh1
]# mdadm --stop /dev/md1;mdadm --zero-superblock /dev/sd[a-j]1;mdadm --
create --level=5 --raid-devices=9 --assume-clean --auto=yes --force
/dev/md1 /dev/sd[a-i]1;mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Fri Jan 1 14:16:31 2010
Raid Level : raid5
Array Size : 196262912 (187.17 GiB 200.97 GB)
Used Dev Size : 292968320 (279.40 GiB 300.00 GB)
Raid Devices : 9
Total Devices : 9
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Jan 1 14:16:31 2010
State : clean
Active Devices : 9
Working Devices : 9
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 720627fd:b0e722a1:0436ea62:f9d2db27
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 8 81 5 active sync /dev/sdf1
6 8 97 6 active sync /dev/sdg1
7 8 113 7 active sync /dev/sdh1
8 8 129 8 active sync /dev/sdi1
]# mdadm --stop /dev/md1;mdadm --zero-superblock /dev/sd[a-j]1;mdadm --
create --level=5 --raid-devices=10 --assume-clean --auto=yes --force
/dev/md1 /dev/sd[a-j]1;mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Fri Jan 1 14:49:33 2010
Raid Level : raid5
Array Size : 489231232 (466.57 GiB 500.97 GB)
Used Dev Size : 292968320 (279.40 GiB 300.00 GB)
Raid Devices : 10
Total Devices : 10
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Jan 1 14:49:33 2010
State : clean
Active Devices : 10
Working Devices : 10
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : db75bd2c:d566c205:0436ea62:f9d2db27x
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 8 81 5 active sync /dev/sdf1
6 8 97 6 active sync /dev/sdg1
7 8 113 7 active sync /dev/sdh1
8 8 129 8 active sync /dev/sdi1
9 8 145 9 active sync /dev/sdj1
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