Re: SATA: RAID 5 controller recommendations
From: Michael VInce (mv_at_roq.com)
Date: Thu, 03 Nov 2005 13:15:58 +1100 To: Markus Kovero <email@example.com>
I have seen some network based SMP related performance problems vanish
in 6.0 tests, admittedly I haven't done hard drive based tests but I
wouldn't surprise me of performance drops on HDs in SMP on 6.0 are gone
Markus Kovero wrote:
> Dell's CERC sata raid thingy works fast for me but when I turn SMP on
> read performance drops 50%+ (raid1,raid5,raid10 and single volumes).
> I don't know if its aac problem or what.
> In leenox it works very well though.
> Markus Kovero
> firstname.lastname@example.org wrote:
>> At 09:17 PM 11/2/2005 +1100, Michael VInce wrote:
>> | For SATA I have always been getting the Dell 750s (now 850s) which
>> use | the 'aac'
>> | Adaptec AdvancedRAID Controller driver, do 'man aac' for more details.
>> | Dell supply them with a 64meg cache and are hardware raid, I have
>> always | just installed FreeBSD on them and only 1 hard drive comes
>> up as RAID | should be.
>> | | I have only been ordering the machines in dual drive mirror 1
>> Raid, but | you could get a PowerEdge Tower servers like the 830
>> which do raid 5, I | never used one though.
>> | Alternatively all the Dell SCSI RAID systems have 256megs cache
>> which | use the LSI Logic MegaRAID ( man amr )
>> | Stay away from the ultra low end SC1425 systems they have some kind
>> of | software based raid.
>> | | The thing I have noticed is that if you compare other (often
>> claiming to | be much cheaper) servers from other companies they
>> often really skimp on | their hard drive subsystems with software
>> based stuff claiming its RAID.
>> | | I used to be anti Dell and build my own U1 servers from case and
>> up and | had a keen interest in cheap RAID technologies but I gave up
>> a little | while ago.
>> | I believe Dell are great value when you consider their RAID |
>> implementations and as long as you are happy with Intel chips.
>> | | Mike
>> | | Steven Hartland wrote:
>> | | > Anyone got any SATA RAID 5 controllers they can recommend
>> | > 64Bit PCIX.
>> | >
>> | > Steve
>> Steve - 3ware is very good.
>> Mike - I have some benchmarks from a guy using a Dell with a raid and
>> surprised to see how slow they were compared to our other hardware.
>> I didn't
>> run them myself, but the guy is on the list here some place. I can
>> send you a
>> copy of the spreadsheet if you want to look it over.
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