Jeremy Chadwick wrote:
On Fri, Oct 17, 2008 at 01:50:38PM +0200, Miroslav Lachman wrote:
Jeremy Chadwick wrote:
On Thu, Oct 16, 2008 at 09:30:20PM +0200, Miroslav Lachman wrote:
Today I was replacing disk in one Sun Fire X2100 M2 so I tried
hot-swapping. It was as you said: atacontrol detach ata3, replace the
HDD, atacontrol attach ata3 and new disk is in the system. I tried
it 3 times to be sure that it was not coincidence - no panic was
produced ;o)
So in this case, hot-swapping on Sun Fire X2100 M2 with FreeBSD 7.0
i386 works.
That's excellent news. So it seems possibly the problem I was seeing
was with "reinit" causing some sort of chaos. I'll have to check things
on my testbox here at home to see how I caused the panic last time.
Thanks for providing feedback, as usual! :-)
Unfortunately there is one problem - I see a lot of interrupts after
disk swapping (about 193k of atapci1)
Interrupts
197k total
ohci0 21
ehci0 22
193k atapci1 23
2001 cpu0: time
1 bge1 273
2001 cpu1: time
Okay, so it looks like the interrupt rate on atapci1 after swapping is
going crazy. What you're showing there looks like heavily modified
vmstat -i output.
The shown is manually cropped from systat -vm, I'll try vmstat -i next
time. ;)
Full output of systat -vm 2 is attached.
It is shown in top as 50% interrupt (CPU state) and load 1 until I
rebooted the machine (I can provide MRTG graphs). The system was not in
production load, but almost idle. (I will put it in production tomorrow).
After reboot, everything is OK.
And this box is running the ATA patch Andrey provided, yes?
It is clean install of FreeBSD 7.0-RELEASE-p5 amd64 without patches.
Can somebody test hot-swapping with SATA drives and confirm this
behavior? (I can't test it now, because machine is in datacenter)
I can test it on my P4SCE box.
I'll check the interrupt rates after each step of the hot-swap to see
if/when the problem starts.
I'll check the interrupts next time too and will post results to this
thread.
Miroslav Lachman
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