On 11/01/2008, at 3:19 PM, Boris Pavlov wrote:
I am not a big fan of 3ware Raid controllers. Up until now it was
they were just plan SLOW...
just a quick word from me - simple, can not agree that they are
slow. they are not SLOW (caps on) either - comparing to soft raid -
same raid level on same computer.
I am glad that you have had better success with them than I have.
My 'slow' experience comes from 2 Linux servers running
[ 40.834489] 3ware Storage Controller device driver for Linux
[ 46.993597] scsi2 : 3ware Storage Controller
[ 46.993692] 3w-xxxx: scsi2: Found a 3ware Storage Controller at
0xafa0, IRQ: 22.
[ 46.993980] Vendor: 3ware Model: Logical Disk 0 Rev: 1.2
[ 46.995418] Type: Direct-Access ANSI SCSI
[ 46.995952] Vendor: 3ware Model: Logical Disk 2 Rev: 1.2
[ 46.997401] Type: Direct-Access ANSI SCSI
[ 46.999678] 3ware 9000 Storage Controller device driver for Linux
0000:02:02.0 RAID bus controller: 3ware Inc 3ware 7000-series ATA-RAID
Subsystem: 3ware Inc 3ware Inc 3ware 7xxx/8xxx-series PATA/SATA-RAID
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 22
I/O ports at afa0 [size=16]
Memory at fe7ffff0 (32-bit, non-prefetchable) [size=16]
Memory at fd800000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at fe7e0000 [disabled] [size=64K]
Capabilities:  Power Management version 1
These cards are about 4 years old now - and the disks directly
connected to the
SATA controller are quicker than the the same disks connected via the
controller - timing with 'dd' and hdparm.
And I have had similar experience on 1 windows server - which is
running the same card.
- Windows 2003 running as a file server.
- This will be replaced in the next 3 months with a NetAPP
As of yesterday, I have discovered that the standard etch 64 bit
does not work correctly with these cards and causes data corruption.
with which models in particular ? you've mentioned "cardS" could you
share which ones you have problems with?
This is a new setup - with 7x identical 3ware 64 bit pci cards (have
started a new thread regarding this problem).
If you want to do it cheap, use Software Raid.
Completely agree. Cheaper raid than software raid is not currently
Note: i did not said 'cost effective'.
Personally - I would use some sort of SAS/ SCSI Raid for the boot
disks, and use an external storage such
as 'Infortrend' or NetApp depending on budget. I really dislike
internal mass storage.