HDD advice?

Ian Molton spyro at f2s.com
Thu Nov 14 15:39:58 PST 2002

On Thu, 14 Nov 2002 21:03:56 +0000 (UTC)
heartboy at nycap.rr.com (Joe Morris) wrote:

> > I know this is a non-ideal case, but 0.8MB/sec! really?! with an 8MB
> > cache on the drive?
> Yeah, you have a serious problem with the drive.  I would return it. 

I ran WDs 'diagnostic' tools on it, but they didnt show any fault...
this could be tricky...

> First though, try using hdparm to make sure that DMA is on (perhaps
> you disabled 'DMA by default' in the kernel by accident?).

Nope. thats all correct - checked and double checked, confirmed with
hdparm ands WD diagnostics.

>  My Maxtor
> ATA/100 60G can attain ~35-38 MB/s using bonnie.

Can you post the results? this is what I get (using bonnie defaults).
Sorry about the linewrap...

Version 1.02c       ------Sequential Output------ --Sequential Input-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP 
/sec %CP
wirenth        496M 18993  91 46772  33 14300  10 18905  85 35090  17
185.1   0
                    ------Sequential Create------ --------Random
                    -Create-- --Read--- -Delete-- -Create-- --Read---
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP 
/sec %CP
                 16  1482  96 +++++ +++ +++++ +++  1511  98 +++++ +++ 
3477  97

The sequential stuff *looks* OK (althought the CPU usage looks a bit
high for the block ops). I have no reference by which to guage the
sequential / random creations...
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