Mark Hahn wrote:
[...]
bah.
redundancy costs - your only choice is what kind of redundancy you want.
raid5 has its issues, but really what's needed is redundancy managed
by the filesystem. doing it block-level is what introduces the pain.
Hello, Mark.
You're right ;-)
I've just been reading about the Hadoop file system. That recommends not
using RAID at all, and just relying on configurable levels of redundancy
in the filesystem. However, I've got a complete mental block about using
the Hadoop filesystem 'shell'. I'll persevere, though because it does
look very interesting. I've been trying to learn how to use it for ages!
3) I'll leave the /boot partition on one of the 3 disks and it will NOT
be included in the RAID array, is this ok?
I think you'd be better off putting your system one one of your three disks,
and making a RAID1 for /home from the other two. This will give you a
I disagree. for one, I strongly advice against partition-o-philia:
the somewhat traditional practice of putting lots of separate partitions
on a system. but for 3 disks, linux MD has a nice mode where each block
is stored twice. so you get 2/3 space efficiency and potentially better
performance.
I'm not quite sure I understand what you're saying here: I have my
system organised in such a way that my 3ware RAID's provide a bare-metal
recovery backup using just three partitions:
sda1 / 40GB
sda2 swap 8GB
sda3 /backup rest of disk
The 'md' RAID5 is four disks with a single partition:
sd[abcd]1 RAID autodetect
How is this "partition-o-philia"?
[...]
MD software raid certainly can support HS - it's mainly a feature of the
controller. (this is not to say that most controllers do HS well.)
I'm interested in that - It was only alpha release when I looked, and
not recommended for production use. I did some experiments, and settled
on hot-swap using the 3ware 8006-2's, with 'md' software RAID10.
.
Bye,
Tony
--
Dr. A.J.Travis, University of Aberdeen, Rowett Institute of Nutrition
and Health, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, Scotland, UK
tel +44(0)1224 712751, fax +44(0)1224 716687, http://www.rowett.ac.uk
mailto:a.tra...@abdn.ac.uk, http://bioinformatics.rri.sari.ac.uk/~ajt
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