On 13/07/15 01:01, jtroan@xxxxxxxxx wrote:
On Wed, 8 Jul 2015, jtroan@xxxxxxxxx wrote:
I'm also thinking about adding a fourth drive and try to config it as a
hot-spare, giving me some extra margin for failure.
I would recommend you turn your raid5 into raid6 instead of having a
raid5+spare. This can be done with a fairly simple command, without
downtime.
I like the idea of using RAID-6 for / (for all the VMs under /var). (I
figure I'll probably still have to do a spare on my RAID-1 device
for /boot .)
What's the (mdadm?) command to convert an MD from RAID-5 to RAID-6?
I think the standard option would be to have a hot spare, and then
something like:
mdadm /dev/mdX --grow --level=raid6
Also, for your raid1, never have a hot spare, just do this:
mdadm /dev/mdX --grow --raid-devices=3
Then you will always have all your data replicated on all three drives,
so again, no hot spare required.
Also remember to duplicate the grub/whatever boot sector....
Regards,
Adam
--
Adam Goryachev Website Managers www.websitemanagers.com.au
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