[CentOS] raid 5 install

Tue Jul 2 06:02:06 UTC 2019
Simon Matter <simon.matter at invoca.ch>

>> You seem to be saying that hardware RAID can’t lose data.  You’re
>> ignoring the RAID 5 write hole:
>>      https://en.wikipedia.org/wiki/RAID#WRITE-HOLE
>> 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.
> Yes. Furthermore, with the huge capacity disks in use today, rebuilding
> a RAID 5 array after a disk fails, with all the necessary parity
> calculations, can take days.
> RAID 5 is obsolete, and I'm not the only one saying it.

Needless to say hardware and software RAID have the problem above.