I'm looking for some advice on how to safely replace disks that has been marked as "normal" instead of "Ready" and at the same time (or after) expand the raid5 capacity as the new disks are larger. I have tried to detail the setup / issues below.
Any advice is appriciated
TS-439 Pro II
Firmware: 3.7.3 Build 20120801
4 x 1 TB disks
Raid5 with all 4 disks
New HDD 4 x 3 TB
Last week when running the HDD SMART scan (full scan), 2 of my disks were downgraded from ready to normal with the following errors:
- Code: Select all
[HDD SMART] HDD 2 Full Test result: Completed: read failure.
[HDD SMART] HDD 4 Full Test result: Completed: read failure.
This has marked the disks as "Normal" instead of "Ready" in the HDD SMART, but the raid is still alive (for now).
I should receive 4 replacement harddisks Monday, but instead of the 1 TB disks that they are replacing these are 3TB disks. According to the built-in help guide, I can not use the expand raid to replace disks and upgrade capacity unless all disk are marked ready. The 2 disks with read failures are marked "Normal" instead of "Ready".
Here is the question
What is the safest procedure to replace all the disk and expand capacity without losing data?
Ps. Yes I have backup of most of it, but it takes a very long time to do a remote restore, and I would lose some data (not to important data but I would like to keep it if possible)