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dtjohnst
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Joined: 23 Apr 2006
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PostPosted: Sat Oct 25, 2008 7:58 pm    Post subject: Virtualized Filesystem Performance Reply with quote

We all know that different filesystems give an increase in performance depending on the application. Some are better with small files, some with big files, etc. No let's say someone had a virtual server overtop of a Gentoo fileserver. That gentoo server could provide the Windows server access to it's drives via samba shares thereby allowing windows to utilize Reiser, XFS, etc.

My question is, in this case, would using XFS or Reiser still provide a performance boost to the Virtual server or would the samba protocols get in the way and make it no faster than local NTFS drives?

If no one has an answer, I'll test it once my new server gets here and report back with my findings. I'd rather be able to get set up and running without knowing I'm going to be tearing it all down after I test it though.
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VinzC
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PostPosted: Sat Oct 25, 2008 10:59 pm    Post subject: Reply with quote

What virtualization technique would you use?

Personally I wouldn't use full virtualization techniques for virtualizing Linux over Linux. OpenVZ is much more appropriate for that. Otherwise there is XEN and paravirtualized hosts if you absolutely need that.

OpenVZ has no performance (or just up to about 3%) decrease for all virtualized environments share the same kernel and filesystem. Guests performance hence is the same as the host's.

With full virtualization, a considerable amount of resources is lost in I/O, such as disk and networking. Even with appropriate guest drivers, I/O remains CPU intensive since "emulated" (kind of). If you must consider virtualizing Windows then your only bets are XEN if you have a recent server machine (with VT extensions) or VMWare Server if you don't.

If all you need is share files, then samba is a better approach. The amount of flexibility you will gain is worth investigating some time.
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