sslug-teknik team mailing list archive

["Jesper K. Pedersen" <jkp@xxxxxxxxxxxxxx>]

On Fri, 15 Aug 2003 11:25:02 +0200
Klavs Klavsen <kl@xxxxxxx> wrote:

> # hdparm -Tt /dev/hdc
> /dev/hdc:
>  Timing buffer-cache reads:   -3008 MB in  0.00 seconds =  -inf kB/sec
>  Timing buffered disk reads:  -1504 MB in  0.00 seconds =  -inf kB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test. 
> 
> # hdparm -Tt /dev/hdd
> /dev/hdd:
>  Timing buffer-cache reads:   128 MB in  2.13 seconds = 59.98 MB/sec
>  Timing buffered disk reads:  64 MB in  1.77 seconds = 36.24 MB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test.
> 
> Hvad pokker sker der her? 
> 
> Jeg har lige indsat nogle nye ATA133 skærmede kabler, for at sikre at
> diskene kunne køre så hurtigt som muligt uden CRC fejl.
> 
> diskene er:
> hdc: ST380021A, ATA DISK drive (Seagate Barracuda IV - 80gb)
> hdd: Maxtor 6Y160L0, ATA DISK drive (Maxtor 160gb)
> 

Jeg oplevede samme effekt efter at skifte til UDMA133 kabler.
hda er en IBM IC35L040AVER07-0 og hdb er IBM-DTLA-305020

# hdparm -tT /dev/hda

/dev/hda:
 Timing buffer-cache reads:   -3386 MB in  0.00 seconds =  -inf kB/sec
 Timing buffered disk reads:  -1693 MB in  0.00 seconds =  -inf kB/sec
Hmm.. suspicious results: probably not enough free memory for a proper
test.
# hdparm -tT /dev/hdb
/dev/hdb:
 Timing buffer-cache reads:   -1712 MB in  0.00 seconds =  -inf kB/sec
 Timing buffered disk reads:  -856 MB in  0.00 seconds =  -inf kB/sec
Hmm.. suspicious results: probably not enough free memory for a
proper test.


# free
             total       used       free     shared    buffers    
cached Mem: 255768     249784       5984          0      55468   
   9812-/+ buffers/cache:     184504      71264
Swap:      1036144     390300     645844


Mvh
Jesper K. Pedersen