[CentOS] Software Raid Recovery
Ross Walker
rswwalker at gmail.com
Fri Feb 20 23:34:41 UTC 2009
On Feb 20, 2009, at 1:53 PM, John R Pierce <pierce at hogranch.com> wrote:
> Stephen Leonard Character wrote:
>> So, to change my swap to raid1, I would need to unmount it, delete
>> the
>> md2 device, and rebuild it as a raid1 md2 device?
>>
>
> swapoff /dev/md2
> # now delete the raid0 and build a raid1
> mkswap /dev/md2
> swapon /dev/md2
>
>
>
> and you probably don't have to change your /etc/fstab assuming the
> metadevice name stays the same.
Since he'll have 4 md partitions after breaking the raid0, create 2
raid1 mds and add them both as priority 1 swap devices and the kernel
will stripe pages across them.
-Ross
PS I prefer to create swap from LVM so to bypass this whole mess all
together. LVM and RAID both come from device-mapper, so it's proven
reliable and well performing technology. I wish ZFS was GPL'd though
so Linux could adopt it and we'd be done talking about file systems
and volume managers.
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