ZFS vs EXT4 vs XFS

Tom Buskey tom at buskey.name
Fri Aug 31 09:44:03 EDT 2007


On 8/31/07, Ben Scott <dragonhawk at gmail.com> wrote:
>
> On 8/31/07, Tom Buskey <tom at buskey.name> wrote:
> > Someone else did a benchmark comparing ZFS on hardware raid vs software
> > raid.  Software was faster on this system, plus you get the ECC type
> stuff
> > with ZFS.
>
>   I regard most such storage-related benchmarks with a great deal of
> suspicion.  They always seem to assume the computer won't be doing
> anything else when the filesystem is being used.



The test was on a Sun x4200(?) aka Thumper.  Multiple Opeterons with dual
cores.

IMHO we're going to see more & more cores in a system by default and most
software will not be keeping up.  I think the OS will be able to take
advantage of the multiple cores and apps will not.  Unless you're running
lots of apps, cores will be idle.  I'd rather have one of those cores
consumed by software raid instead of being idle.  Maybe that won't be quite
as fast as a dedicated hardware raid but it's in my system already so I can
buy a $20 multi SATA port card instead of a $xxx multi SATA RAID card.

The bottleneck will be, IMO, I/O.  Disk data will go though that no matter
if you have hardware or software raid.
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