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Upgrading (replacing) healthy disks with newer, faster disks
I have a RN102 with 2x4GB disks in x-raid. These disks are WD Green @5400RPM. I have Purchased x2 4GB WD RED @7200RPM.
What is best practice for replacing these disks?
Do I power off, replace one disk, power up and wait for rebuild, then repeat for #2? Or is there other prep I need to do?
StephenB wrote:
There is no need to turn off the NAS, it is fine to remove disk one with the NAS running, and then hot-insert the replacement. After resync to the same with disk two. Either way, if disk 1 is healthy it will function as a backup copy (you can reboot the NAS with only that disk installed)
File system on hot removed disk can be healthy and can be not. This is lottery. The file system love shutdown. Correct way to get healthy backup copy is to remove disk from turned off NAS.
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1. turn off NAS
2. remove any one disk from NAS. This disk will be your backup copy if something wrong with new disk synchronization
3. turn on NAS with one old disk. Wait system booting.
4. insert new disk into working NAS. Synchronization will be started. Wait for rebuild.
5. After rebilding replace in the working NAS second old disk. Wait for rebuilding.
6 Finish.
sotrack wrote:
1. turn off NAS
2. remove any one disk from NAS. This disk will be your backup copy if something wrong with new disk synchronization
3. turn on NAS with one old disk. Wait system booting.
4. insert new disk into working NAS. Synchronization will be started. Wait for rebuild.
5. After rebilding replace in the working NAS second old disk. Wait for rebuilding.
6 Finish.
There is no need to turn off the NAS, it is fine to remove disk one with the NAS running, and then hot-insert the replacement. After resync to the same with disk two. Either way, if disk 1 is healthy it will function as a backup copy (you can reboot the NAS with only that disk installed).
I agree with Vandermerwe that going with NAS-purposed drives is a good decision. WDC Red drives have essentially the same spindle speed as the greens, WDC Red Pro run at 7200 rpm. The RN102 is limited by its CPU speed, so the WDC Reds are fine. Even in the higher-end NAS, the Reds perform quite well, and run a lot cooler than 7200 rpm drives.
StephenB wrote:
There is no need to turn off the NAS, it is fine to remove disk one with the NAS running, and then hot-insert the replacement. After resync to the same with disk two. Either way, if disk 1 is healthy it will function as a backup copy (you can reboot the NAS with only that disk installed)
File system on hot removed disk can be healthy and can be not. This is lottery. The file system love shutdown. Correct way to get healthy backup copy is to remove disk from turned off NAS.
You have made a good decision in changing to NAS specific disks although I don't think the spindle speed of the Reds is 7200, it is probably closer to 5400.
It is certainly necessary to have a backup when performing interventions like this. Do you have a backup of the data on the NAS? I would not advise you to remove a disk from the array to use as a backup. It may work in certain circumstances, but it is far better to have a backup on another device that can be read on another device.
If you have an existing backup, you can either replace 1 disk at a time allowing resync before inserting the second disk; or you can start from scratch by inserting both new disks, factory defaulting, restoring the config, then restoring the data and any apps you had.
If you don't have a backup then perhaps you need to create one as you should always maintain a backup.
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