Re: LVM usage
On Wed, May 21, 2003 at 07:04:15PM +0200, Arnd Bergmann wrote:
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> On Wednesday 21 May 2003 17:28, Jack Cobb wrote:
> > We are interested in using LVM on our Debian Woody install. We
> > currently have a box with two DASD devices using the ext3 filesystem.
> > Has anyone used LVM before and are there any issues we should be aware
> > of before proceeding?
> - - Use LVM striping to get better performance. If you can exchange
> your two dasds for 4 to 8 smaller ones (not more minidisks on the
> same dasd), that will even be better. Don't use striping among
> minidisks on one dasd.
If you are allowed to use dedicated dasds (allocated on a Shark or some
similar storage), ask the dasd administrator to allocate the disks from
separate clusters and also from separate ranks. He/she might find this a bit
unusual, but never mind, it will increase your throughput. Using of more
than one channel helps obviously also a lot. The striping factor should be
either the number of the channels used, or (a bug in older LVM versions) the
number of the physical volumes.
"Growing Old is Mandatory, Growing Up is Strictly Optional"