AFAIK there is a hard timeout in linux kernels for stalled IO. 120
seconds, if I remember correctly.
And there is no way to prevent those errors without playing with guest
kernels and dom0 kernel.
18.06.2013 03:47, Nathan March пишет:
Hi,
Have been playing around with XCP and I'm looking to achieve high
resiliency in the situation of a backend NFS SR failure. I've got an
existing cluster based around xen open source and I've successfully
tested NFS outages of as long as 1 hour, during which IO/VMs simply
hang and upon recovery typically come back gracefully.
Unfortunately when I try pulling access from an xcp host, it pretty
quickly (within a minute or two) starts returning I/O errors:
[871449.552331] end_request: I/O error, dev tda, sector 26384232
[871457.632417] end_request: I/O error, dev tda, sector 19276360
Likewise in the VM I'm seeing I/O errors being returned:
[ 4657.253261] end_request: I/O error, dev xvda, sector 19276432
[ 4657.253264] Buffer I/O error on device xvda4, logical block 50002
[ 4657.253268] lost page write due to I/O error on xvda4
[ 4657.253275] end_request: I/O error, dev xvda, sector 19276440
[ 4657.253283] end_request: I/O error, dev xvda, sector 19276448
I've tried mounting the NFS SR with -o hard instead of the default
soft but it seemed to have no significant impact.
Is what I'm looking to do possible with XCP? I'd simply like the vms
to hang while waiting for IO or optionally have the HV pause them (I
think vmware does this). Googling has failed me so any useful tips
would be appreciated, thanks!
- Nathan
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