Andrew Pantyukhin wrote:
On 1/17/07, Josef Karthauser <[EMAIL PROTECTED]> wrote:
A poll for opinions if I may?
I've got a few gmirrors running on various machines, all of which
pair up two drives at the physical level (i.e. mirror /dev/ad0s1
with /dev/ad1s1). Of course there are other ways of doing it to,
like mirroring at the partition level, ie pairing /dev/ad0s1a with
/dev/ad1s1a, /dev/ad0s1e with /dev/ad0s1e, etc.
Apart from potentially avoiding a whole disk from being copied
during a resync after a crash, are there any other advantages to
using partition level mirroring instead of drive level mirroring?
I can imagine people using partition-level raid to
implement a popular configuration:
You divide a couple of identical drives proportionally
in two partitions each, place a couple of the first
partitions into gmirror and a couple of the second
ones into gstripe. This way you get both reliable and
fast storage with just two drives. Some strings are
attached.
The head movement that this causes makes it a poor performer. It is
an option, but not a terribly popular one.
Scott
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