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Back to a previous OS configuration
I have a ReadyNAS Ultra 2 (2HDDs RAID Level X-RAID2) and I would like to install/test some new debian packages. My both HDDs are in RAID Level X-RAID2 and are identical (both green).
I would like to install the new deb packages only on one HDD to perform some tests (e.g use HDD-2 & remove HDD-1; keep HDD-1 with initial configuration). Depending on my tests results I would like to go back to the previous OS configuration on both HDDs (initial image from HDD-1) or to keep my new deb packages and update HDD-1 to HDD-2.
The idea is: I would like to do some changes/tests on my NAS then to be able to go back or to keep my changes (using the RAID feature). Any idea?
Thank you
I would like to install the new deb packages only on one HDD to perform some tests (e.g use HDD-2 & remove HDD-1; keep HDD-1 with initial configuration). Depending on my tests results I would like to go back to the previous OS configuration on both HDDs (initial image from HDD-1) or to keep my new deb packages and update HDD-1 to HDD-2.
The idea is: I would like to do some changes/tests on my NAS then to be able to go back or to keep my changes (using the RAID feature). Any idea?
Thank you
4 Replies
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- No you cannot do that, RAID configurations dont allow it.
- What you could do is power down the NAS, remove both disk drives, and install a blank test disk. Then do your testing, and reverse the process. Make sure the NAS is powered down when you swap the drives though.
- If I perform next procedure:
1) install only HDD-1 on NAS
2) create a dummy file test-1.txt (on HDD-1)
3) power off and remove HDD-1 then install only HDD-2
4) power on and create a dummy file test-2.txt (on HDD-2 )
5) power off NAS and reinstall HDD-1 and power on
6) modify file test-1.txt
7) power off NAS and install both HDDs (HDD-1 + HDD-2), then power on.
Which image I will have finally, the one with the file test-1.txt (LAST MODIFIED) or depends on HDD bay position on NAS?
Thank you - Every time the NAS detects a disk insertion, the NAS will treat that disk as if it were new - and re-build it from the one already installed. Though in this scenario it is far better to inert the disks with the unit running, and not powered down - you want to ensure that the NAS is reliably detecting that the disks are out of sync, and that is much better if the NAS sees the disk removals/insertions.
Doing this procedure regularly is a bad idea. Rebuilding the array is not a 100% reliable process, you should avoid doing it unnecessarily. Also, the trays/SATA connections to the NAS are not intended for frequent insertions/removals.
It is far better to do your testing with a scratch disk, and then install again onto your production disks. IF the NAS is powered down when you remove them/reinsert them, then it will not attempt to rebuild the RAID array.
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