-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@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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