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Using elevator=noop in RHEL

Why do we use Elevator=noop in /etc/grub.conf, Does it matter if its on a physical or virtual server.
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aanya247
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aanya247
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Seth SimmonsSr. Systems AdministratorCommented:
it helps in vmware

Testing has shown that NOOP or Deadline perform better for virtualized Linux guests.


Linux 2.6 kernel-based virtual machines experience slow disk I/O performance (2011861)
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2011861
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MazdajaiCommented:
Yes it does matter.

Using VMware as an exmaple, it is recommended to noop (minimum cpu resources to manage disk IO) because hypervisor does the disk request for the VM guests on the block level.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2011861

Bottom line you will need to verify the hyperviosr vendor - KVM or XenServer.
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