On 26/07/2011 08:48, DA Forsyth wrote:
Hi all
I am busy putting together a new server. I want to avoid using the
motherboards raid 'hardware' (intel matrix raid) and rather do it all
in software so if anything goes wrong with the motherboard, the
drives can work in some other box.
I have 4x 1TB drives available for the main data array.
graid3 can only use 3
graid5 can use all 4, but is it production ready?
any ideas?
Take everything I say with a grain of salt, I am still testing these
kinds of setup.
I do not know about graid5, but gvinum is very slow when used in a raid5
config, this is especially true for meta intensive operations, such as
rsync.
graid3 should be even worse as Raid3 is supposed to work on the octet
level (In software mode it actually writes in sector, but I do not know
how it computes).
Another thing that strongly encourages me to stay away from graid3,
graid5 and gvinum raid5 is that the examples were removed from the handbook.
I ended up using gvinum in a mix of concat and stripe. Not as efficient
in terms of data space, but much much faster.
In your case for example I would cut all the drives in two subdisks and
go for a RAID10 setup.
The advantage of using graid3 at this point is that the extra 1TB
drive I have can then go into the backup server which needs more
space anyway.
Having suffered data loss on the previous raid5 (intel matrix) array
when UFS went bananas due to one drive failing, I am looking at
solutions/preventatives. Will gjournal be useful?
Thanks
--
DA Fo rsyth Network Supervisor
Principal Technical Officer -- Institute for Water Research
http://www.ru.ac.za/institutes/iwr/
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