I'm thinking of changing raid 1 to raid 5 (phisical --> in bios, now i've got 2 disks in raid1, i want to add 3rd disk). Will centos work correctly?
cheers
Mariusz
From: Mariusz settlerk@atp-czesci.pl I'm thinking of changing raid 1 to raid 5 (phisical --> in bios, now i've got 2 disks in raid1, i want to add 3rd disk). Will centos work correctly?
If it is physical RAID, CentOS should only see logical disk(s) and not the underlying physical disks... I guess it all depends if your RAID controller supports RAID1 to RAID5 migration.
JD
On Fri, Dec 19, 2008 at 03:17:25AM -0800, John Doe wrote:
From: Mariusz settlerk@atp-czesci.pl I'm thinking of changing raid 1 to raid 5 (phisical --> in bios, now i've got 2 disks in raid1, i want to add 3rd disk). Will centos work correctly?
If it is physical RAID, CentOS should only see logical disk(s) and not the underlying physical disks... I guess it all depends if your RAID controller supports RAID1 to RAID5 migration.
JD
ok, thanks for reply, but logical disk(s) will be the same? after migration?
Mariusz
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On Fri, Dec 19, 2008 at 02:00:43PM +0000, Karanbir Singh wrote:
Mariusz wrote:
ok, thanks for reply, but logical disk(s) will be the same? after migration?
Did you ask your vendor / manufacturer of the raid layer ? What did they say ?
- KB
no, i haven't asked yet, but i'm going to do it. Maybe i should use dd command (create image all logical disk to another disk) and add new 3rd disk, create raid 5 volume and after restore system from dd image?
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Mariusz wrote:
On Fri, Dec 19, 2008 at 02:00:43PM +0000, Karanbir Singh wrote:
Mariusz wrote:
ok, thanks for reply, but logical disk(s) will be the same? after migration?
Did you ask your vendor / manufacturer of the raid layer ? What did they say ?
- KB
no, i haven't asked yet, but i'm going to do it. Maybe i should use dd command (create image all logical disk to another disk) and add new 3rd disk, create raid 5 volume and after restore system from dd image?
dd is a sector by sector image of a disk, not very useful for moving file systems. if its e3fs, I'd use dump -> spare storage, rebuild the raid, then restore -> new raid. or tar or cpio or whatever your favorite backup method is that preserves links and stuff.
Mariusz wrote:
Did you ask your vendor / manufacturer of the raid layer ? What did they say ?
no, i haven't asked yet, but i'm going to do it. Maybe i should use dd command (create image all logical disk to another disk) and add new 3rd disk, create raid 5 volume and after restore system from dd image?
Most vendors have their own way of doing raid type convertions and will expect the metadata to move in specific ways, so depending on the hba, you really are better off backing up the data elsewhere, perhaps remove one of the raid-1 disks, create a raid5 in degraded mode move the data over, and add the older disk as hotspare. But then again, that depends on how the hba does these things.
- KB
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Mariusz