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Re: New Mailserver...

From: Andrew Miehs <andrew(at)2sheds.de>
Date: Fri Jan 11 2008 - 09:38:38 EST

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
>>> because
>>> 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 v1.26.02.001.
[ 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  
revision: 00
[   46.995952]   Vendor: 3ware     Model: Logical Disk 2    Rev: 1.2
[   46.997401]   Type:   Direct-Access                      ANSI SCSI

revision: 00
[ 46.999678] 3ware 9000 Storage Controller device driver for Linux v2.26.02.004.

0000:02:02.0 RAID bus controller: 3ware Inc 3ware 7000-series ATA-RAID (rev 01)

	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: [40] 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 3ware
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

Do you need help?

>>>
>>> As of yesterday, I have discovered that the standard etch 64 bit
>>> kernel 2.6.18-5
>>> 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
> available.
>
> 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.

Cheers

Andrew

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Received on Fri Jan 11 09:39:10 2008

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