[CentOS] Upgrading system from non-RAID to RAID1

Wed Jan 11 18:33:52 UTC 2023
H <agents at meddatainc.com>

On 01/11/2023 02:09 AM, Simon Matter wrote:
> What I usually do is this: "cut" the large disk into several pieces of
> equal size and create individual RAID1 arrays. Then add them as LVM PVs to
> one large VG. The advantage is that with one error on one disk, you wont
> lose redundancy on the whole RAID mirror but only on a partial segment.
> You can even lose another segment with an error on the other disk and
> still have redundancy if the error is in another part.
> That said, it's a bit more work to setup but has helped me several times
> in the decades ago.
But is your strategy of dividing the large disk into individual RAID1 arrays also applicable to SSDs? I have heard, perhaps incorrectly, that once a SSD fails, the entire SSD becomes unusable which would suggest that dividing it into multiple RAID1 arrays would not be useful?