disk diagnostics

[Bill Hacker]

Freddie Cash wrote:

On Tue, July 25, 2006 12:34 pm, Bill Hacker wrote:

Pieter Dumon wrote:

how can I diagnose my disk read/write throughput under DFLy ? my
system runs well except that untarring even small tar files or
deleting files takes a lot of time (e.g. the removal of
/usr/obj/usr/src/world_i386 during a make buildworld takes about 25
minutes (I admit it's got a lot of files, but still....)).
I don't know if it can have anything to do with my strange
configuration of having the two harddisks on ATA1 while the CDs are
on ATA0. The disk with the DFly slice is only UDMA33 (there are no
DFLy
slices on the other disk), but still, under windows and linux I
don't have this slow disk access.
ad2: 28629MB <ST330621A> [58168/16/63] at ata1-master UDMA33
ad3: 76319MB <WDC WD800BB-00JHC0> [155061/16/63] at ata1-slave
UDMA100
acd0: DVD-R <AOPEN DUW1608/ARR> at ata0-master PIO4
acd1: CDROM <CD-ROM 36X/AKU> at ata0-slave PIO4


Agree that is not an optimal set up - faster IDE drives uusally fare
best on 80-pin cable to ad0 (master) and ad2 (master) with CD's as
slaves, or better yet, on a PCI-bus add-on controller so there is no
master/slave speed difference.


It really depends on
*snip*

(lots of stuff that no way adds up to 25 minutes, and probably not 25 seconds, 
either...)

Let's not start.  I still have ISS-80 parts on-hand.

The issue is finding Warren Hull.

Warren Hull 25 minutes delay comes in, and I/O tuning doesn't cover that. Too 
big a number for where it is being reported as happening.

Either something else - probably something *basic* but simply overlooked - is 
placing demands on that storage system, or the 'problem' has been misreported.

Bill