Hi,
did anybody out there achieve more than 25 MB/s (bonnie) Linux SW-RAID-5
performance using:
- the mainboard GA-6BXDS (Gigabyte, Dual-Slot1, Dual-UW-SCSI onboard)
- some other mb or controller with Adaptec AIC-7895 Dual-UW-SCSI chip
- some other controller (Symbios etc.)
I wondered because I already did some RAID systems using this board and
performance seemed to be limited to 25MB/s:
Using this board, both channels and 4 IBM DDRS UW SCSI disks (2 channels,
each has 2 disks), I got about 25MB/s.
That value looked quite OK regarding that the real data (including redundancy)
transferred to the disks is 33% more and a single DDRS is at 10..12 MB/s (don't
remember exactly).
Strange: I "only" got about the same value with 4 IBM DNES UW SCSI disks.
A single DNES disk gives about 17MB/s bonnie - about 50% (?) more than the
older DDRS disk can do - so I had expected a transfer rate of >35MB/s (the
SCSI channels theoretically could provide 2 * 40MB/s).
So why don't I see better throughput using the faster disks ?
CPUs (2 * Celeron 500, 100MHz FSB ;-) didn't look like being at 100%.
RAID5 parity/xor routines tell me >1GB/s at boot time.
So where could the "problem" be (not that I'm unhappy, just still wondering
... ;-) ?
Ideas:
- "allocation problems" on SCSI bus ?
- AIC7895 limitation ?
- PCI limitation ?
- Board design problem ?
- CPU ?
- SW ?
BTW: did anybody try a similar setup with the boards with U2W onboard
controller (like GA6-BXDU or Asus) ? Benchmark Results ?
Thomas
--
Thomas Waldmann (com_ma, Computer nach Masz)
email: [EMAIL PROTECTED] www: www.com-ma.de
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