NAS drive throwing errors - replace all or just one

[Hodders]

I have a Synology 4 drive NAS.

One of the drives is starting to throw some occasional warnings suggesting some bad sectors.

The data is backed up on about 3 different places so that's sorted.

But given all the drives are about 8 years old, I'm guessing if one is failing, then the others might not be to far behind.

Thoughts?

I really don't want to buy 4 6TB drives at the mo as the prices seem crazy. But Equally, don't want to have to rebuild the NAS if two drives totally fail in quick succession.

 

[Snapshot]

I would definitely replace them all, given their age. But how you do it depends on what RAID you've used. If it's RAID 5 or 6 then replacing them one at a time will stress the remaining drives and could cause multiple failures. If it's RAID 10 then it's not such a worry as only one other drive is involved and it's a straightforward read operation.

If you're open to s/h drives then a Wanted post in the MM could be worthwhile.