From Fedora Project Wiki

< FWN‎ | Beats

(reset)
()
Line 15: Line 15:
 
[http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list].
 
[http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list].
  
==== ====
+
==== Distributing I/O Load Among Guests ====
 +
Dennis J.
 +
asked<ref>http://www.redhat.com/archives/fedora-virt/2009-July/msg00183.html</ref>
 +
"What is the best way to deal with I/O load when running several VMs on a
 +
physical machine with local or remote storage?" "What I'm primarily worried about is the case when several VMs cause disk I/O at the same time." "What is the best way to soften the impact of such a situation?"
 +
 
 +
[[PasiKärkkäinen|Pasi Kärkkäinen]]
 +
suggested "If the IOS are not split evenly between VMs, you could use some tool like
 +
dm-ioband<ref>http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband</ref> to make sure IOs are split fairly between VMs. Or then get faster disks. Single 15k rpm SAS disk will give you up to 350
 +
IOPS, so it's 2-3x faster than 7200 rpm SATA."
 +
 
 +
[[RichardJones|Richard Jones]]
 +
concurred<ref>http://www.redhat.com/archives/fedora-virt/2009-July/msg00188.html</ref>
 +
"For KVM, each VM isn't really any different from a host process, so
 +
you have to deal with them the same way that you'd deal with having
 +
lots of host processes doing I/O.  So: lots of spindles, expensive I/O
 +
hardware, etc."
 +
 
 
<references />
 
<references />
  

Revision as of 00:29, 3 August 2009



Virtualization

In this section, we cover discussion of Fedora virtualization technologies on the @fedora-virt, @fedora-xen-list, @libguestfs, @libvirt-list, @virt-tools-list, and @ovirt-devel-list lists.

Contributing Writer: Dale Bewley

Fedora Virtualization List

This section contains the discussion happening on the fedora-virt list.

Distributing I/O Load Among Guests

Dennis J. asked[1] "What is the best way to deal with I/O load when running several VMs on a physical machine with local or remote storage?" "What I'm primarily worried about is the case when several VMs cause disk I/O at the same time." "What is the best way to soften the impact of such a situation?"

Pasi Kärkkäinen suggested "If the IOS are not split evenly between VMs, you could use some tool like dm-ioband[2] to make sure IOs are split fairly between VMs. Or then get faster disks. Single 15k rpm SAS disk will give you up to 350 IOPS, so it's 2-3x faster than 7200 rpm SATA."

Richard Jones concurred[3] "For KVM, each VM isn't really any different from a host process, so you have to deal with them the same way that you'd deal with having lots of host processes doing I/O. So: lots of spindles, expensive I/O hardware, etc."

Fedora Xen List

This section contains the discussion happening on the fedora-xen list.


Virtualization Tools List

This section contains the discussion happening on the virt-tools-list list.


Libguestfs List

This section contains the discussion happening on the libguestfs list.


Libvirt List

This section contains the discussion happening on the libvir-list.


oVirt Devel List

This section contains the discussion happening on the ovirt-devel list.