Date: Thu, 03 Nov 2005 13:15:58 +1100 From: Michael VInce <mv@roq.com> To: Markus Kovero <markus.kovero@multiwise.fi> Cc: freebsd-performance@freebsd.org Subject: Re: SATA: RAID 5 controller recommendations Message-ID: <436972DE.8070002@roq.com> In-Reply-To: <436896BD.6090405@multiwise.fi> References: <000801c5d434$579de280$b3db87d4@multiplay.co.uk> <000801c5d434$579de280$b3db87d4@multiplay.co.uk> <3.0.1.32.20051102022618.00a73dc0@pop.redshift.com> <436896BD.6090405@multiwise.fi>
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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 >> >> _______________________________________________ >> freebsd-performance@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-performance >> To unsubscribe, send any mail to >> "freebsd-performance-unsubscribe@freebsd.org" >> >> >
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