On Tue, 19 Feb 2002 kb@karsten-becker.de wrote:
> Hi,
> I want to create an IDE-Raid with 4-6 drives using Raid 5. Therefor i
> want to buy a HW-Raidcontroller. The Adaptec ATA RAID 2400A EFIGS and
> the Promise SuperTrak SX6000 IDE Should fit my whishes.
> The only problem I have is that I couldn't find any benchmarks using
> Linux. Maybe some of you tested one of this Controllers and can tell me
> what he's thinking about the controller. Especially benchmarks would
> interest me.
> Thanks in advance,
I have no benchmarks for these controllers, but some for 3ware escalade IDE
raid controllers. From my research it seemed these were the best ones to get.
This might give you an idea of what to look for in performance.
Tyan TigerMP, AMD 760MP chipset, dual athlonXP 1800+
3-Ware Escalade 7410, Maxtor D540X 120GB drives (two and four drives)
Kernel 2.4.16, 99GB ext2 filesytem
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
RAID0 2d 1500 20767 99.0 38409 16.9 17173 9.7 17810 84.5 71408 25.5 327.9 1.9
RAID0 4d 1500 20863 99.5 75553 34.5 17293 10.2 19161 91.8 102605 39.9 503.8 2.4
RAID5 4d 1500 5989 28.4 5602 2.2 3883 2.0 11864 56.8 85523 34.2 436.2 1.6
Supermicro 370DE6, ServerWorks HE-sl chipset, dual PIII 1000
3-Ware Escalade 7850, Maxtor D540X 120GB drives (four drives)
Kernel 2.2.20, 99GB ext2 filesystem
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
RAID0 4d 1300 19981 99.6 78259 43.5 25303 33.4 18295 88.9 141316 80.5 787.4 4.5
RAID5 4d 1300 19892 99.1 26533 12.2 6856 8.8 15146 73.3 92960 49.0 785.9 2.9
Hopefully I will be able to add more drives to the 7850 controller, which can
hold up to 8, and see if that increases RAID5 performance. However, even the
current hardware raid5 is much faster than a Mylex Extremeraid 3000, which is
a much more expensive card (about $1600 vs $650) and uses much much more
expensive SCSI drives ($8.20/GB vs $1.66/GB). I didn't save the E3000
benchmarks, but it was about 20MB/sec write and 50MB/sec read I think.
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