RE: Grendel - Linux file system testing - long post

["Mark Knecht" <mknecht controlnet com>]

Leonard,
   Yes, thanks, I am aware of that. There is a Windows app for testing
read/write speeds, but its name escapes me right now, that draws a nice
graph of access times across the whole disk, so you see this.

   Another thing people here might be interested in that relates directly is
that sometimes your disk will have a defect on the platter, so the drive
manufacturer will remap other clusters/sectors into that logical address
space. These remapped areas are often at the end of the drive, so when
mapping speeds across the drive you may see little portions of the "fast"
portion that look slow because the drive actually has to seek to the
remapped physical location. (Bad sentence construction...hope my meaning is
clear)

   Staying on topic for Linux, I'd really like to find a nice little app
that did this sort of testing and display under Linux. hdparm -tT is not
sufficient...

   Thanks again Leonard!

Cheers,
Mark

-----Original Message-----
From: redhat-install-list-admin redhat com
[mailto:redhat-install-list-admin redhat com]On Behalf Of Leonard den
Ottolander
Sent: Wednesday, October 02, 2002 1:51 AM
To: redhat-install-list redhat com
Subject: Re: Grendel - Linux file system testing - long post


Hi Mark,

>    What I'd like to do is mount each of the new Linux partitions (hda4,
> hda8, hda9 & hda10 - currently all ext2), check that they are all working,
and
> then convert each of them to a different file system for testing. This
keeps
> all the file systems on the same drive and HD controller.

 When comparing performance of the different partitions note that disks get
slower on the inside, ie reading from hda8 will be somewhat faster than
reading from hda9. The difference can be quite noticable, especially if the
partitions are large in size. Check with hdparm.

Bye,
Leonard.




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