[CentOS] Upgrading system from non-RAID to RAID1

Thu Jan 12 19:45:07 UTC 2023
H <agents at meddatainc.com>

On 01/12/2023 03:00 AM, Simon Matter wrote:
>> Hallo Simon,
>>> Anyway, the splitting of large disks has additional advantages. Think of
>>> what happens in case of a failure (power loss, kernel crash...). With
>>> the
>>> disk as one large chunk, the whole disk has to be resynced on restart
>>> while with smaller segments only those which are marked as dirty have to
>>> be resynced. This can make a bit difference.
>> I am not sure if this is true. If a underlying disk fails, it will mark
>> all partitions on that disk as dirty, so you will have to resync them all
>> after replacing or readding the disk into the array.
> No, I'm not talking about a complete disk failure, my example wasn't a
> failure at all but a server problem like power loss, kernel crash and such
> things. In this case only the segments which were not in sync at the time
> of the crash will be resynced on restart, not the whole disk.
> The same is, if a read error happens on one disk, only the partial segment
> will lose redundancy and not the whole contents of the disk.
> That's a huge improvement especially on very large disks.
> Simon
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I have not seen anyone comment on my plan to after partitioning the new SSDs that I have to do a new minimal install of C7 and then copy the old disk partitions - with the exceptions of /boot  and /boot/efi - over the newly made installation?

Am I correct in that is needed since the old installation was not using RAID and and the new one does? Both of course are using C7.