Preferable bdflush values for EXT3 performance on Large (multi-TeraByte) RAID

[M K]

Sorry I forgot to ask:
are there any values for bdflush that work better for large / very large ext3 partitions with a very large number of writes?



M K <maheshext3 at yahoo.com> wrote:
Oh I see.. Thanks.. 
So HDD's RPM and on-drive buffer would matter a lot on large RAIDs then? is there a way to tune the file system to minimise this impact ?
Again, Thanks in advance!
MK

"Charles P. Wright" <cpwright at cpwright.com> wrote:
This can easily be explained by seek time.

If you have a 3GB partition on a 300GB disk, you are only using 1% of
the surface of your disk. During the test on a smaller partition, head
doesn't have to move as far as it does with the larger partition.

Charles

On Wed, 2004-05-12 at 22:09, M K wrote:
> Has anyone experienced a significant degradation in ext3 performance
> when using it on a Multi-TeraByte RAID? As part of an experimental
> setup, I hooked up three 300GB drives and made an EXT3 RAID5 out of
> them, using the entire space one each drive, and started throwing a
> large number of files in the size-range 3KB to 50 KB. Then, I deleted
> the raid, and created a new one, but this time, I used only 3 Gigs
> from each drive (a very small RAID compared to the earlier one). After
> repeating the same ! test, a huge improvement in performance was see -
> hence, the question : does ext3 performance degrade significantly as
> the file system size increases?
> 
> Thanks in Advance,
> MK
> 
> 
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