[CentOS] Re: Anaconda doesn't support raid10
Ross S. W. Walker
rwalker at medallion.com
Sat May 12 22:52:39 UTC 2007
> -----Original Message-----
> From: centos-bounces at centos.org
> [mailto:centos-bounces at centos.org] On Behalf Of John R Pierce
> Sent: Friday, May 11, 2007 5:57 PM
> To: CentOS mailing list
> Subject: Re: [CentOS] Re: Anaconda doesn't support raid10
>
>
> > Well the reason not to put /boot on the same spindles as md1 has
> > already been mentioned a few times. Basically flexibility.
> > What do you mean LVM doesn't really do striping? What does
> globbing
> > mean? Does it mean there is no performance difference between
> > striping LVM and just concatenating 2 raid1's?
>
>
> conventional stripesets tend to use a stripe size around 32k or 128k
> bytes. LVM tends to use a fairly large PE size, often 32MB.
> LVM -is-
> striping these PE's, if you told it to do that, but its striping with
> this very large chunk size, which means far fewer individual disk
> operation will utilize both logical drives. If you have lots of
> concurrent disk accesses, this may not matter.
LVM interleaving uses 64K chunk by default and writes these chunks
across the extents on the physical volumes in a round robin fashion.
The chunk size can be changed with the -I option and supports 4K to
1M.
Check out lvmcreate and the -i option.
-Ross
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