El jue, 21-06-2007 a las 06:55 -0500, mikee escribió:
> On Thu, 21 Jun 2007, Scott McDaniel might have said:
> I'm doing this now and should end up with about ~2T of RAID5 when
I know that RAID5 is very appealing 'cause you end with 'a lot of usable
disk space' but, I always discourage to use it.
Each chunk of data to be written to disk is divided in Numer of physical
RAID disks writes - 1 plus another write to store CRC on to the
remaining disk ( the CRC chunk is written in a round-robin model using
all RAID disks ). For write changed data, the RAID logic must locate
where the data was, rewrite it and calculate the changes to the parity
to reflect the changes
Another important point is the time spend on rebuild a previously failed
disk ( data is not copied from antoher disk, is regenerated using the
data in CRC chunks )
And another tip, If fails 2 disks, good by data, must restore from
backup
Always try to use any more 'friendly' RAID as RAID1 / RAID10
Best regards
D.
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