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Need assistance on RAID/drive configuration
Hello all, I am a new user of ReadyNAS as of this weekend and so far love it. I have a question about the drives being used and am hoping someone can point me in the right direction.
There are ...
CrookedLanes wrote:
1. If the default "XRAID" is simply mirrored, why when I check volumes does it says I only have 1TB available? Shouldn't I have 2TB?
if you have 2x1TB mirrored, then both drives have the same content. Writes are done in parallel to both drives. So you only have a 1 TB volume.
CrookedLanes wrote:
2. Say I decide to purchase additional 4TB drives to match speeds and be the same size, do I hot-swap from (A and B) individually one at a time so data gets copied automatically?
If you want to upgrade the two existing drives, then you do need to hot-swap individually and wait for the resync to complete before you add the next. When you do that, the new drive is rebuilt from the remaining drives.
Though you'll probably want to insert the existing 4 TB drive in C (giving you 2 TB), and the second one in D (giving you 6 TB). Then if you upgrade A you'll end up with 9 TB, and finally upgrading B will give you 12 TB.
StephenB wrote:
CrookedLanes wrote:
I currently have (2) 1TB drives in (A, B) however they are different models and I already got thrown and error about mismatching drives before having to resync data.
That's not really an error, it's advisory (likely the speeds aren't the same). You can safely ignore it, the only consequence is that the overall speed is limited by the slowest drive.
Not entirely true. It is a warning. But drives with speed mismatches can cause vibration at different frequencies, potentially causing pre-mature failure. This is especially true if using desktop drives without vibration protection and/or if the NAS is mounted on a non-stable surface. And a bigger problem the bigger the NAS. It's a huge deal in a server where there can be 10,000 or 15,000 RPM SAS drives. Some people even avoid mixng in a rack.
But, then, I cannot figure out why, when I was running a bunch of RAID experiments with some older HGST enterprise, 7200RPM drives, that the NAS said the 1TB versions were 5900RPM while the 2TB were 7200TB.
Sandshark wrote:
StephenB wrote:
CrookedLanes wrote:
I currently have (2) 1TB drives in (A, B) however they are different models and I already got thrown and error about mismatching drives before having to resync data.
That's not really an error, it's advisory (likely the speeds aren't the same). You can safely ignore it, the only consequence is that the overall speed is limited by the slowest drive.
Not entirely true. It is a warning. But drives with speed mismatches can cause vibration at different frequencies, potentially causing pre-mature failure. This is especially true if using desktop drives without vibration protection and/or if the NAS is mounted on a non-stable surface. And a bigger problem the bigger the NAS.
Well, he has a four-bay NAS with only two drives at present. Personally I ran mixed speeds in my Pro-6 for some years, with no evidence of early failure. I'm still running them in my old Duo (~50K hours on one of the drives).
I'm not seeing any study that confirms (or refutes) the vibration frequency theory. Do you have a source that provides information, or is this more hypothetical - like the theories that drive spindown will increase (or decrease) the life of the drive?
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