Re: Upgrading system from non-RAID to RAID1

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On 01/11/2023 01:33 PM, H wrote:
> 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?
Follow-up question: Is my proposed strategy below correct:

- Make a copy of all existing directories and files on the current disk using clonezilla.

- Install the new M.2 SSDs.

- Partitioning the new SSDs for RAID1 using an external tool.

- Doing a minimal installation of C7 and mdraid.

- If choosing three RAID partitions, one for /boot, one for /boot/efi and the third one for the rest, do I go with the default mdraid version, ie 1.2 I believe?

- Copying the backup above with contents of the the existing disks, ie not just /root and /home but all other directories and files to the new disks from the clonezilla backup. Note that the new disks will be larger.

- Change the boot sequence in the BIOS and reboot.


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