Am 29.11.2017 um 23:20 schrieb Wol's lists:
On 29/11/17 20:02, Reindl Harald wrote:
why not RAID5/6? besides
https://www.askdbmgt.com/why-raid5-should-be-avoided-at-all-costs.html
the parity data are additional writes wearing out the drives
So, if I have a four-drive raid 5, for every 3 blocks of data I write I
write 1 parity block. But with raid 1 or 10, for every 3 blocks of data
I write, I write *3* "parity" blocks!
What was that about "the additional writes wearing out the drives" then?
(Yes, I get the write amplification thing - but if you are writing a lot
of data, then raid 5 needs far *fewer* writes.)
RAID10 has a lot of other benefits:
* better performance at all
* lower CPU usage
* only 1 disk is affected with reads at rebuild
* you can clone a whole phyiscal machine easily by just move
half of the drives to a new machine and start rebuild on
both - in the past years i cloned multiple machines that
way which are after that in sync with "synch-machine.sh push/get"
especially the clone thing saves a lot of time when you collected over
time machines with all sorts of use-cases and storage sizes and you just
need to consider which one has the most similar setip to the new one
before i drive home from the office "synch-machine.sh push && power off"
and when i arrive at the office -> CTL+ALT+F" -> Login as root ->
"synch-machine.sh get", CTRL+ALT+F1 -> grapical login
that way of work is BTW a great backup for human mistakes :-)
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