> -----Original Message----- > From: centos-bounces at centos.org > [mailto:centos-bounces at centos.org] On Behalf Of Johnn Tan > Sent: Monday, August 06, 2007 3:52 PM > To: CentOS mailing list > Subject: Re: [CentOS] "near native" performance with xen? > > Ross S. W. Walker wrote: > > Of course you need physical volumes but look for a storage > > solution that will also run as direct to disk as possible, > > maybe something based on the newer SATA/SAS where the RAID > > logic is built into the enclosure and a plain SATA/SAS > > card is in the server which can be actively shared between > > multiple domUs. > > > > If that is out of your budget then use some type of hardware > > RAID for your volumes to get rid of any use of software RAID > > in dom0 for guest storage. > > I'm not sure what the distinction is between your first > paragraph and the second. When I read the first paragraph, I > thought: "hardware RAID" but it seems like you're referring > to something else. The distinction is small, but the costs are great. 1st one, the RAID technology is in the enclosure where you can have multiple initiators (even from the same host) directly access the logical disks in the arrays, you can also have multiple paths to those logical disks. PV'ing these drivers would be a lot simpler then if the RAID technology were in the controller card itself. This isn't iSCSI, but the newer SAS/SATA technology. The controller card is simpler and can be abstracted much in the same way a network adapter can be. The 2nd is what you are familiar with RAID controller hooked into JBOD enclosure. > > Same goes for the network side of things. Install the latest > > PV drivers in the domUs to get the latest advances. > > I didn't realize these existed. I just used whatever was > pulled down when I install xen/kernel-xen via yum. Where can > I get these PV drivers? My mistake I was thinking HVM guests. If you want the latest for HVM I think Novell sells them, or you can try the 5.1 versions in testing. -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.