 | | | Creating large RAID arrays | Creating large RAID arrays 2005-08-12 - By Lee Whatley, Contractor
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Hello,
I have a RHEL v3 system with a 3ware 9xxx controller. Currently there
are two RAID 5 arrays attached to this controller which gives me two 2TB
disks (/dev/sda and /dev/sdb). The OS is installed on a different drive
on a different controller (/dev/sdc).
I have heard rumors that RHEL v3 would be able to see all 4TB as one
device if I used mdadm to make a RAID0 device from the two 2TB drives.
When I try to create the array however, it doesn't work. Has anyone
else been able to do this with disks this size? Can anyone verify that
this does or does not work under RHEL v3? FWIW, I can see the full 2TB
of each drive if I format and mount them separately. Here is the command
that I am running and the error that I receive:
$> mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sda1 /dev/sdb1
mdadm: RUN_ARRAY failed: Invalid argument
Also, dmesg shows the following info after running the command:
raid0: looking at sda1
raid0: comparing sda1(1953062080) with sda1(1953062080)
raid0: END
raid0: ==> UNIQUE
raid0: 1 zones
raid0: FINAL 1 zones
raid0: zone 0
raid0: checking sda1 ... contained as device 0
(1953062080) is smallest!.
raid0: zone->nb_dev: 1, size: 1953062080
raid0: current zone offset: 1953062080
raid0: done.
raid0 : md_size is 1953062080 blocks.
raid0 : conf->smallest->size is 1953062080 blocks.
raid0 : nb_zone is 1.
raid0 : Allocating 16 bytes for hash.
md: marking sb clean...
md: md0 stopped.
md: unbind<sda1,0>
md: export_rdev(sda1)
md: bind<sda1,1>
md: bind<sdb1,2>
md: sdb1's event counter: 00000000
md: sda1's event counter: 00000000
md0: max total readahead window set to 512k
md0: 2 data-disks, max readahead per data-disk: 256k
raid0: looking at sda1
raid0: comparing sda1(1953062080) with sda1(1953062080)
raid0: END
raid0: ==> UNIQUE
raid0: 1 zones
raid0: looking at sdb1
raid0: comparing sdb1(1953062080) with sda1(1953062080)
raid0: EQUAL
raid0: FINAL 1 zones
raid0: zone 0
raid0: checking sda1 ... contained as device 0
(1953062080) is smallest!.
raid0: checking sdb1 ... contained as device 1
raid0: zone->nb_dev: 2, size: 3906124160
raid0: current zone offset: 1953062080
raid0: done.
raid0 : md_size is -388843136 blocks.
raid0 : conf->smallest->size is 3906124160 blocks.
raid0 : nb_zone is 4722518619.
raid0 : Allocating 75560297904 bytes for hash.
md: pers->run() failed ...
md: md0 stopped.
md: unbind<sdb1,1>
md: export_rdev(sdb1)
md: unbind<sda1,0>
md: export_rdev(sda1)
Thanks in advance!
-Lee
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