On 07/07/2017 03:26 PM, Veljko wrote:
I just noticed that I replied to Wol insted to list.
On Wed, Jul 5, 2017 at 8:07 PM, Wols Lists <antlists@xxxxxxxxxxxxxxx> wrote:
On 05/07/17 17:42, Roman Mamedov wrote:
On Wed, 5 Jul 2017 17:34:09 +0200
Veljko <veljko3@xxxxxxxxx> wrote:
Hello,
I have a RAID10 device which I have formated using the mkfs.xfs
defaults (Stan helped me with this few years back). I reached 88%
capacity and it is time to expand it. I bought 4 more drives to create
another RIAD10 array. I would like to create linear device out of
those two and grow XFS across the 2nd device. How can this be done
without loosing the existing device's data? I would also like to add a
spare HDD. Do I have to have a separate spare HDD for each array or
one can be used by both of them?
Why make another RAID10? With modern versions of mdadm and kernel you should
be able to simply reshape the current RAID10 to increase the number of
devices used from 4 to 8.
I was thinking of replying, but isn't that not possible for some
versions of RAID-10?
My feeling was, if you can't just add drives to the existing raid 10,
create a new one which you can expand, migrate the fs across (btrfs
would let you do that live, I believe, so xfs probably can too), then
you can scrap the old raid-10 and add the drives into the new one.
Cheers,
Wol
Thanks for your input, Roman and Wol.
Expanding existing RAID is one of the options, but I was advised by
Stan Hoeppner to do it this way and I tend to believe him on this
subject. With my metadata heavy backup workload, this will provide
better performance.
So my question is still, how can an existing array be added to linear
device, and it's file system expanded over the second array.
For this to work the existing RAID10 array must already be a member of a
linear device with one component device. If this linear array already
exists then you could add another RAID10 array to the linear device. If
you currently have an XFS filesystem sitting atop a 'bare' RAID10 then I
don't believe the linear option will work for you. Thus I'd tend to
agree with others that reshaping your current RAID10 is the best option.
My apologies if I wasn't clear in my previous advice.
Stan
And there is also question of spare drive.
Regards,
Veljko
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