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Forum Discussion
Are drives mounted in Linux redundant?
As some of you will know I recently went through a disk array recovery (3 x 2.0 TB in Readynas NV). I sequentially cloned and drives and then used Linux to mount the set of clones to get my data. T...
X-RAID for Sparc uses a dedicated parity disk. I don't think this disk is used at all if you're mounting the array in an ordinary Linux machine. The procedure is intended for data recovery attempts only (at your own risk, of course). So you do need all disks apart from the parity disk to be healthy for the recovery attempt to work smoothly.
The above only applies to our legacy Sparc systems. The procedures for all our other models (both X-RAID2 and Flex-RAID) and Flex-RAID on Sparc would use RAID.
With Flex-RAID the RAID would be used. However for Sparc Flex-RAID RAID-5 it may be a little more complicated, if I recall correctly.
If you'd rather not do the data recovery attempt yourself we do sell data recovery services that could be used to attempt the data recovery using a new unit. See e.g. ReadyNAS: Migrating disks from RAIDiator 4.1 or RAIDiator 5.3 to ReadyNAS OS 6 for more information.
My recovery is working out but I was having trouble understanding how the parity disk was being used when mounted by Linux and now I know why: it isn't used.
As it is time to move on from my original Infrant ReadyNAS NV. My thoughts are to move to a 2 disk system for the following reasons:
- $/TB is so low
- I always had more capacity than I needed with 3 installed disks
- every so often one must change out drives so there is a natural growth in installed size that should keep up to my needs
So then, what flavour of ReadyNAS RAID is the easiest to recover out of the NAS on a 2 disk system? or are they all the same for the 2 diskers?
The dedicated parity disk was only used by our Sparc systems the last of which was replaced in our product lineup back in November 2011.
With current models all RAID modes should be equally straightforward to recover. Though of course some RAID levels are better choices than others like they would be in any server e.g. a single RAID-0 volume spanning both disks is a bad idea as if either disk failed all data would be lost.I'd probably stick with the default X-RAID2 in e.g. a RN212 or RN422. It depends on what your needs are which way you'd want to go.
The RN422 has a display on the front and uses an Intel CPU. It'd be my preference.
LongTimer wrote:
My recovery is working out but I was having trouble understanding how the parity disk was being used when mounted by Linux and now I know why: it isn't used.
As it is time to move on from my original Infrant ReadyNAS NV. My thoughts are to move to a 2 disk system for the following reasons:
- $/TB is so low
- I always had more capacity than I needed with 3 installed disks
- every so often one must change out drives so there is a natural growth in installed size that should keep up to my needs
So then, what flavour of ReadyNAS RAID is the easiest to recover out of the NAS on a 2 disk system? or are they all the same for the 2 diskers?
XRAID/RAID-1 is the easiest to recover (the disks are mirrored, so you can recover easily from either disk). It's also easily expanded. So I think the default XRAID mode is the best option.
The least expensive 2-bay in the currently shipping ReadyNAS line is the RN212. That will certainly do, but the RN422 offers a bit more performance, a longer warranty, and has an LCD panel. So I'd go for the RN422 if your budget permits.
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