I increased my disk speeds by a factor of 5 after a little tuning. From 4
--> 20+M a second. This page at oreillynet is definitely a good read on
the subject:
http://www.oreillynet.com/pub/a/272
happy tuning -- joe
>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 12/4/00, 10:55:11 AM, "Bob Crandell" <[EMAIL PROTECTED]> wrote
regarding [EUG-LUG:5191] Re: disk read speeds:
> My Firewall where I don't care haw fast the HD is:
> CSGate:~# hdparm -tT /dev/hda
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 2.86 seconds =44.76
> MB/sec
> Timing buffered disk reads: 64 MB in 4.21 seconds =15.20
> MB/sec
> My file server (I'm hoping will replace our NW4.11 someday):
> csmule:~# hdparm -tT /dev/hda
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 7.93 seconds = 16.14
> MB/sec
> Timing buffered disk reads: 64 MB in 6.18 seconds = 10.36
> MB/sec
> Hmm.. suspicious results: probably not enough free memory for a
> proper test.
> /dev/hdb:
> Timing buffer-cache reads: 128 MB in 7.82 seconds = 16.37
> MB/sec
> Timing buffered disk reads: 64 MB in 6.65 seconds = 9.62
> MB/sec
> Hmm.. suspicious results: probably not enough free memory for a
> proper test.
> csmule:~# free
> total used free shared buffers
> cached
> Mem: 160252 156112 4140 32752 118264
> 8412
> -/+ buffers/cache: 29436 130816
> Swap: 224896 2152 222744
> I've heard this stuff is tweak-able. How do I? Where do I
> start?
> >>> Cory Petkovsek <[EMAIL PROTECTED]> 12/2/2000 9:13:14
> PM >>>
> <snip>
> What kind of rates do you guys get with various hardware?
> Controllers, Raid, IDE, mdma/udma 33/66/100...
> Test your read speed under linux:
> ide only: (tests cache and disk reads, independently)
> hdparm -tT /dev/hda
> any drive:
> time dd if=/dev/sda of=/dev/null bs=1024 count=102400
> (returns minutes and seconds)
> bc
> 100/(minutes*60+seconds)
> <snip>
> Cory
