Hi, Op 3-4-2012 10:02, Andrey Korolyov schreef:
Hi, # virsh blkdeviotune Test vdb --write_iops_sec 50 //file block device # virsh blkdeviotune Test vda --write_iops_sec 50 //rbd block device error: Unable to change block I/O throttle error: invalid argument: No device found for specified path
That is correct. As far as I know iotune uses the underlying cgroups from the OS.
RBD devices (when using Qemu) are not block devices which can be managed by cgroups. That's why it's not working and you get the error that the device can't be found.
There is however somebody working on DiskIoThrottling inside Qemu: http://wiki.qemu.org/Features/DiskIOLimits
That would work with RBD (he even names Ceph :) ) Wido
2012-04-03 07:38:49.170+0000: 30171: debug : virDomainSetBlockIoTune:18317 : dom=0x1114590, (VM: name=Test, uuid=8c27bf32-82dc-315a-d0ba-4653b1b3d595), disk=vda, params=0x1114600, nparams=1, flags=0 2012-04-03 07:38:49.170+0000: 30169: debug : virEventPollMakePollFDs:383 : Prepare n=8 w=11, f=16 e=1 d=0 2012-04-03 07:38:49.170+0000: 30169: debug : virEventPollCalculateTimeout:325 : Calculate expiry of 4 timers 2012-04-03 07:38:49.170+0000: 30169: debug : virEventPollCalculateTimeout:331 : Got a timeout scheduled for 1333438734170 2012-04-03 07:38:49.170+0000: 30171: error : qemuDiskPathToAlias:11338 : invalid argument: No device found for specified path 2012-04-03 07:38:49.170+0000: 30171: debug : virDomainFree:2313 : dom=0x1114590, (VM: name=Test, uuid=8c27bf32-82dc-315a-d0ba-4653b1b3d595) 2012-04-03 07:38:49.170+0000: 30171: debug : virUnrefDomain:276 : unref domain 0x1114590 Test 1 2012-04-03 07:38:49.170+0000: 30171: debug : virReleaseDomain:238 : release domain 0x1114590 Test 8c27bf32-82dc-315a-d0ba-4653b1b3d595 2012-04-03 07:38:49.170+0000: 30169: debug : virEventPollCalculateTimeout:351 : Timeout at 1333438734170 due in 5000 ms 2012-04-03 07:38:49.170+0000: 30169: debug : virEventPollRunOnce:619 : EVENT_POLL_RUN: nhandles=9 imeout=5000 2012-04-03 07:38:49.170+0000: 30171: debug : virReleaseDomain:246 : unref connection 0x1177b10 2 libvir 0.9.10, json-escape patch applied, but seems that this problem related to another incorrect path handle. I`m in doubt if it belongs to libvirt ml or here. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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