Re: SATA: RAID 5 controller recommendations

From: Michael VInce (mv_at_roq.com)
Date: 11/03/05

  • Next message: Mike Tancsa: "Re: SATA: RAID 5 controller recommendations" 
    Date: Thu, 03 Nov 2005 13:15:58 +1100
To: Markus Kovero <markus.kovero@multiwise.fi>

    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
    as well.

    Mike

    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.
    >
    > Yours
    > Markus Kovero
    >
    > ray@redshift.com 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
    >> was
    >> 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.
    >>
    >> Ray
    >>
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    >>
    >
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  • Next message: Mike Tancsa: "Re: SATA: RAID 5 controller recommendations"

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