[CentOS] raid 5 install

[Simon Matter]

> On Mon, 1 Jul 2019, Warren Young wrote:
>
>> If you then bring up battery backups, now you’re adding cost to the
>> system.  And then some ~3-5 years later, downtime to swap the battery,
>> and more downtime.  And all of that just to work around the RAID write
>> hole.
>
> Although batteries have disappeared in favour of NV storage + capacitors,
> meaning you don't have to replace anything on those models.

That's what you think before you have to replace the capacitors module :-)

Simon