Date: Wed, 02 Nov 2005 12:36:45 +0200 From: Markus Kovero <markus.kovero@multiwise.fi> To: freebsd-performance@freebsd.org Subject: Re: SATA: RAID 5 controller recommendations Message-ID: <436896BD.6090405@multiwise.fi> In-Reply-To: <3.0.1.32.20051102022618.00a73dc0@pop.redshift.com> References: <000801c5d434$579de280$b3db87d4@multiplay.co.uk> <000801c5d434$579de280$b3db87d4@multiplay.co.uk> <3.0.1.32.20051102022618.00a73dc0@pop.redshift.com>
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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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