With regards to your message at 01:53 PM 8/21/02, Alvin Oga. Where you stated:
>3ware has a 8-port ide card ... for 8 master ide disks but its
>still on one pci buss ( i think thats the bottle neck )
And a 12 port card too.
>if you have 12, 26 ide disks... you'd need a 2nd pci slot...but again
>on the one pci buss...
We do this all the time. 2 of the cards. One array.
>i think it'd be better to put one ide controller ( like the 3-ware )
>into one motherboard... and use a different server for the next 8 disks
Don't need it.
Bottleneck is that the card is 64 bit, but only 33MHz.
It's throughput maxes around 160MB/sec.
This is a limitation of the PCI at 64/33
>-- am looking for benchmarks of 8-24-48 hard disks systems
Here is for 2 x 8 port cards, 16 x Maxtor 160GB.
RAID5, on a Tyan S2460 AthlonMP board with a single Duron CPU.
Cards in JBOD mode, using Linux software RAID.
Version 1.02a ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
raiddawg 4G 17752 89 78709 44 55648 32 20109 98 162752 67
224.3 1
------Sequential Create------ --------Random
Create--------
-Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP /sec %CP
16 1240 99 +++++ +++ +++++ +++ 1284 99 +++++
+++ 3581 99
raiddawg,4G,17752,89,78709,44,55648,32,20109,98,162752,67,224.3,1,16,1240,99,+++++,+++,+++++,+++,1284,99,+++++,+++,3581,99
With a faster CPU the writes go up higher, typically up to 90MB/sec.
Reads still max around 160MB/sec.
With a single card and 8 drives we get the same type of numbers.
With 2 of the 12 port cards and 24 disks we still get the same numbers.
Note these tests use 4GB file size.
If you use some smaller size you can get higher figures, but is essentially
bullshit, as these are then influenced by Linux cacheing, drive caches, etc..
With our best regards,
Maurice W. Hilarius Telephone: 01-780-456-9771
Hard Data Ltd. FAX: 01-780-456-9772
11060 - 166 Avenue mailto:maurice@harddata.com
Edmonton, AB, Canada http://www.harddata.com/
T5X 1Y3
2.3TB RAID5 NAS server - dual AthlonMP CPU, Linux, $10,995 CAD / $6850 USD
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