SATA: RAID 5 controller recommendations

[Mike Tancsa]

At 09:15 PM 02/11/2005, Michael VInce wrote:
>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.

Yes, I noticed that well.  Unfortunately I seem to have a bad drive 
as well so I will have to try swapping it tomorrow.  Although it 
might just be a cable / connector issue as smartmontools doesnt see 
anything on the drive.

da0: <AMCC 9550SX-4LP DISK 3.01> Fixed Direct Access SCSI-3 device
da0: 100.000MB/s transfers
da0: 343290MB (703057920 512 byte sectors: 255H 63S/T 43763C)
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0009): Drive timeout detected: port=0
twa0: ERROR: (0x04: 0x0002): Degraded unit: unit=0, port=0


>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 at 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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