[UCI-Linux] 3ware <-> USB & KDE conflict on AMD64-SMP (Kubuntu)?
hjm at tacgi.com
Thu Jun 30 09:07:11 PDT 2005
Here's an interesting data point - hopefully almost to the end of my degrading
experience with 3ware / AMD64Linux / Western Digital / hotswap cages /
Dual Opteron / Kubuntu / etc.
All 8 x 250GB disks are up and running on the 3ware 9500S-8, in repaired
hotswap cages, filesystem is XFS (better io by 30-50% than ext3 by both
bonnie++ and usage and much less CPU utilization). All the disks passed 2 x
smartctl long tests before being put into service and there have been no
complaints from them or the 3ware since they spun up.
However, I have discovered an interesting glitch in all the hardware swapping
When running Ubuntu/Kubuntu AMD64-SMP (and only SMP) on both 2.6.10-5 and
2.6.11-1 kernels, the 3ware controller prevents the USB from working
correctly. This isn't a killer issue for us, but it would be nice - we run a
UPS that communicates via USB and a sysadmin would like to use the machine
for his USB Palm cradle.
Additionally, when KDE starts up, it frequently locks up the system (easy
solution - remove KDE; it's a server, no loss), but this would seem to be a
serious flaw with one of KDE, 3ware, or AMD64-SMP.
Consider this a single data point that might be wrong, but it's easily
repeatable on our IWILL DK8X mobo.
With the onboard 4-port Silicon Image controller and a $20 Syba/Silicon Image
4 port PCI controller, I had no such problems when I was hot-testing the
disks and in SW RAID. Both USB and KDE worked as advertised. It doesn't
appear to be an interrupt conflict, but I guess I could move the 3ware to
another slot at next reboot.
Anyone see anything like this?
Resources (many of them dated but they give good background on the issues):
- dated, but better than most in terms of trying different tuning tricks
- mostly marketing, but some useful info
- much more info, less marketing
- and the thread that follows; very close to my hardware situation
- dated but a lot of useful info in one place
- extensive review of SATA controllers;
highly recommended if you're in the market for HW SATA RAID
Harry J Mangalam - 949 856 2847 (vox; email for fax) - hjm at tacgi.com
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