[K12OSN] Raid Level Choice
Liam Marshall
lsrpm at mts.net
Wed Dec 22 16:38:58 UTC 2004
Les Mikesell wrote:
>On Wed, 2004-12-22 at 09:58, Liam Marshall wrote:
>
>
>
>>Question is, which way is better, 5 or 10? or does someone prefer
>>something else
>>
>>
>
>RAID5 causes a big hit on write speed and most systems are also
>very slow in degraded mode when you continue to run with a failed
>drive.
>
>If you can afford to lose half your disk space (and with IDE/SATA
>that's no longer a big expense), using RAID1 will give better
>performance. Then you need to consider the tradeoffs for mounting
>each RAID1 device as a separate partition (pro: you can recover
>data from a single drive - con: inflexible disk space layout), vs.
>combining them in a fixed combination with RAID 0 + 1, vs. running
>LVM to merge the space. If I had a reasonable backup system working
>so the disaster recovery scenario didn't matter, I'd lean toward
>LVM over RAID1 pairs, especially if starting fresh with FC2/k12ltsp4.2
>which defaults to LVM in the installer.
>
>---
> Les Mikesell
> les at futuresource.com
>
>
>
>
and if I was considering raid for my disaster recovery option? I don't
really have a back up option other that a script I use to copy files
from the server onto my laptop's hard drive, then burning. This of
course plays havoc with permissions etc. and is not a good solution,
just a solution.
I don't have 6 drives, so 50 etc is out. But between 5 and 10 which
provides better performance while still giving reasonable disaster
recovery? In my environment, there is more reading than writing and I
am teaching office applications which on the whole are small files,
except for Presentation files
I just downloaded and burnt the iso for 4.2.0 rc1 (what does rc1 stand for?)
I have a SATA raid controller that will do hardware raid. Can you
explain why I might want to use LVMs instead? I think that is what you
are suggesting
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