Slow drives

  • Thread starter Thread starter Miss Perspicacia Tick
  • Start date Start date
M

Miss Perspicacia Tick

I have 2x75GB Raptors in a RAID 0 stripe 2 array and a single 7.2K 250GB on
its own channel. I have just benchmarked both with SANDRA because I'm not
happy with the performance and it confirmed my suspicions. They're both
benching at half speed! The 10Ks have a throughput of 67MB/s and the 7.2K at
30.

How do I set them up so they're running at full speed? It rather defeats the
object of spending nearly £200 per 10K drive! The 10Ks are on a Promise
controller which appears to be built into the board. Someone tell me what to
tweak and I'll tweak it.

SANDRA was run after a reboot with all non-essential processes killed.

I'm not happy!
 
Miss said:
I have 2x75GB Raptors in a RAID 0 stripe 2 array and a single 7.2K 250GB on
its own channel. I have just benchmarked both with SANDRA because I'm not
happy with the performance and it confirmed my suspicions. They're both
benching at half speed! The 10Ks have a throughput of 67MB/s and the 7.2K at
30.

How do I set them up so they're running at full speed? It rather defeats the
object of spending nearly £200 per 10K drive! The 10Ks are on a Promise
controller which appears to be built into the board. Someone tell me what to
tweak and I'll tweak it.

SANDRA was run after a reboot with all non-essential processes killed.
Click to expand...

Try checking with DiskSpeed32. Sandra is sometimes misleading.

http://www.geocities.com/vgrinenko/DiskSpeed32/

Virg Wall
 
Miss said:
I have 2x75GB Raptors in a RAID 0 stripe 2 array and a single 7.2K
250GB on its own channel. I have just benchmarked both with SANDRA
because I'm not happy with the performance and it confirmed my
suspicions. They're both benching at half speed! The 10Ks have a
throughput of 67MB/s and the 7.2K at
30.

How do I set them up so they're running at full speed? It rather
defeats the object of spending nearly £200 per 10K drive! The 10Ks
are on a Promise controller which appears to be built into the board.
Someone tell me what to tweak and I'll tweak it.
Click to expand...
They are running at full speed, what speed were you expecting? Those
figures sound about right.
 
Apollo said:
They are running at full speed, what speed were you expecting? Those
figures sound about right.
Click to expand...

So a 9ms seek time is correct for a 10K drive?! Funny that WD advertise half
that and a 144MB/s transfer rate. Maybe I should have them for false
advertising?
 
You must read the specs carefully. Seek time can be full stroke seek or 1/3 stroke, or even less if they want to give you better numbers. 144 MB/sis probably the disk controller to bus speed and not read speed.
So a 9ms seek time is correct for a 10K drive?! Funny that WD advertisehalf
that and a 144MB/s transfer rate. Maybe I should have them for false
advertising?
Click to expand...

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Mike Walsh
West Palm Beach, Florida, U.S.A.
 
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