[PLUG] A poorly-performing hard drive

[John Cadigan]

Keeping in mind that not all drives are created equal, some other factors
must be considered. Mainly things like, how much cache or memory buffer
exists? A drive with 2 MB of cache memory, verses newer drives with 8 MB
will obviously perform differently...so you must compare apples w/ apples. I
am assuming you may have considered these things in comparing the two (WD?)
drives.  Not to get off subject, but Maxtor has some nice features of late..
speaking of speed and such. Also concider, IDE v.s. SCSI etc, (but I know
you must be doing this)? 
 
-------Original Message-------
 
From: plug at lists.pdxlinux.org
Date: Thursday, January 22, 2004 21:56:45
To: plug at lists.pdxlinux.org
Subject: [PLUG] A poorly-performing hard drive
 
Just for grins, I decided to do a benchmark test on my big shiny new
120G WD. I came up with some weird numbers:

# hdparm -tT /dev/hdb

/dev/hdb:
Timing buffer-cache reads: 1568 MB in 2.00 seconds = 784.00 MB/sec
Timing buffered disk reads: 22 MB in 3.25 seconds = 6.77 MB/sec

I was expecting the second number to be over 20MB/s, because my old 15G
produces around 18 MB/s. What does this mean?

Evan


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