Unix/Linux Go Back    


Virtualization and Cloud Computing Xen, VMWare, hypervisors, Amazon Elastic Computing Cloud, EC2, virtual storage, Amazon S3 and other cloud computing topics.

ionice command to set i/o priorities for domUs

Virtualization and Cloud Computing


Closed    
 
Thread Tools Search this Thread Display Modes
    #1  
Old Unix and Linux 05-17-2010
iga3725 iga3725 is offline
Registered User
 
Join Date: Oct 2009
Last Activity: 21 July 2011, 11:43 AM EDT
Location: Andorra
Posts: 125
Thanks: 5
Thanked 0 Times in 0 Posts
ionice command to set i/o priorities for domUs

Hi, I have xen on a debian lenny with more then 20 VM. The supermicro
server has a raid10 with a good performance, but I have IO issues when
one VM is making backup, it affects the performance of the other VMs.
I've setup cpus, vcpus, sched-credit between dom0 and domUs as doc
recommended, but I'm still facing IO problems. So I found a way to
mediate disk access with ionice from the dom0. I mean changing
priority to domUs PID. See below more details.

I'm using CFQ scheduler
dom0:~# cat /sys/block/[sh]d[a-z]*/queue/scheduler
noop anticipatory deadline [cfq]
noop anticipatory deadline [cfq]

It's a part of ps regarding block devices:
15747 ? S< 0:00 \_ [blkback.64.xvda]
15748 ? S< 0:54 \_ [blkback.64.xvda]
20353 ? S< 0:00 \_ [blkback.71.xvda]
20354 ? S< 0:05 \_ [blkback.71.xvda]
2361 ? S< 0:00 \_ [blkback.112.xvd]
2362 ? S< 0:15 \_ [blkback.112.xvd]
26596 ? S< 0:00 \_ [blkback.122.xvd]
26597 ? S< 0:00 \_ [blkback.122.xvd]
27203 ? S< 0:00 \_ [blkback.123.xvd]
27204 ? S< 0:00 \_ [blkback.123.xvd]

Finally, I change these PIDs with ionice and make several tests but
I'm still confuse with the results. My question:

Does anybody on this list use ionice to mediate disk priority to disk
intense domU with ionice from dom0?

appreciate your help.
Sponsored Links
Closed

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Linux More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
crontab priorities TechFly AIX 5 08-18-2008 01:53 PM
setting thread priorities bankpro Programming 1 01-17-2006 10:39 AM



All times are GMT -4. The time now is 01:08 PM.