[Beowulf] RAID for home beowulf
tomislav.maric at gmx.com
Mon Oct 5 03:19:01 PDT 2009
Mark Hahn wrote:
>> the other nodes are to be diskless.. I have separated these partitions:
>> /swap /boot / /var and /home. Is this ok?
> I don't believe there is much value in separating partitions like this.
> for instance, a swap partition has no advantage over a swap file,
> and the latter is generally more convenient. separating /boot is
> largely a vestige of quite old bioses which could not do 48b LBA
> addressing (ie, deal with big disks.) separating /, /var and /home
> is largely a matter of taste:
> - separate /home means that you can blast / and /var when
> you upgrade or change distros.
> - separating / and /var means that something like syslog or
> mail can never fill up the root partition. which is generally
> not a serious issue anyway: if anything, this argues for putting
> /tmp in a separate partition, but leaving /var inside /...
> - more partitions (filesystems) means more time spent waiting
> for disk heads to seek. remember that write activity on any fs
> (modern, journaling) requires some synchronous writes, and
> therefore can't be lazy-ified or elevator-scheduled when you have
> multiple partitions.
> I think it's always a good idea to minimize partitions, though we can
> probably argue about how many is best. I suppose one factor in favor
> of separate, purpose-specific filesystems is that they might be split
> into different raid levels. for instance, /tmp might be raid0, perhaps
> /var a >2 disk raid10 for write speed, and /home left on /, both under
> raid6. but given that you don't want multiple filesystems competing
> for access to the same disk(s), I'm skeptical of this approach...
> in short, it's perfectly OK to use one big filesystem. or you can just
> use the distro's default partitioning scheme. in the end it's not going
> to make much difference.
> regards, mark hahn.
Thank you very much for the info. There so much of this stuff that's
totally new to me. I think I'm going to feel very lucky if I ever get
this thing to work properly.
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