> -----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 ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.