Messages in this thread | | | From | jim@rubylane ... | Subject | Re: Update on Promise 100TX2 + Serverworks IDE issues -- 2.2.20 | Date | Wed, 3 Apr 2002 06:52:02 -0800 (PST) |
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> > On Tue, 2 Apr 2002 jim@rubylane.com wrote: > > > > > > > On Tue, 2 Apr 2002 jim@rubylane.com wrote: > > > > 2. The MB IDE ports transfer data at about 18000K/sec while doing > > > > cat /dev/hda >/dev/null and looking at vmstat. > > > > > > I think the serverworks IDE is only mode4, not even UDMA33. I heard a lot of > > > bad things about it, and removed all the IDE drives from our serverworks > > > system's controller. > > > > > > > hdk. In a 32-bit slot, cat /dev/hdx >/dev/null shows 31300K/sec. But > > > > doing cat /dev/hde4 (a specific partition) for example gives > > > > 8400K/sec. That makes no sense to me. > > > > > > The outer cylinders of a drive are faster than the inner cylinders. Try > > > repartitioning the drive so that hde4 starts at cylinder 1, and see if that > > > changes the speed. > > > > That's not it because all 4 drives are partitioned the same, yet hde4 > > gives 8400K/sec and hdk4 gives 31000K. Also there are the same number > > of interrupts/sec and context switches per sec according to vmstat in > > the 8400 and 31000 case. > > sure you've got the same block size? 8400 * 4 is suspiciously close the > 31000 ... I don't use vmstat, so I'm not sure if it reports blocks or > kbyte /sec
Yeah, I even remade the file systems on both drives and got the same result.
After moving the drives around on the Promise controller and moving 1 drive back to the MB IDE port, it looks like all drives are running at high speed. I dunno - it's weird. I wouldn't be surprised if one of the drives arbitrarily reverts back to the slower speed at some point or after a future reboot, though it hasn't yet.
I was thinking maybe burst mode was not getting turned on, not working, or getting turned off on some of the Promise ports for some reason.
vmstat reports KB/sec.
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