Actually, read performance drop is still there under FreeBSD 6.0 RC1
Yours
Markus Kovero
Mike Tancsa wrote:
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
[EMAIL PROTECTED] 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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