Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
On 08/02/16 02:20 PM, Gokan Atmaca wrote:
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity.
Those are slow and have poor seek latency. Slow-down of other servers when one hits the disk hard has to be expected.
Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
I don't understand what you are saying/asking, sorry.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
Slow disks will show up as higher I/Owait times. If your seeing 99% cpu usage then your likely looking at some other problem.
If you run top what are you seeing on the %Cpu(s) line?
On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
If you run top what are you seeing on the %Cpu(s) line?
%20
On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr alvin@netvel.net wrote:
Slow disks will show up as higher I/Owait times. If your seeing 99% cpu usage then your likely looking at some other problem.
If you run top what are you seeing on the %Cpu(s) line?
On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
You need to provide more information. 20% is what number. There are something like 6 numbers on that line.
On 02/08/2016 02:56 PM, Gokan Atmaca wrote:
If you run top what are you seeing on the %Cpu(s) line?
%20
On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr alvin@netvel.net wrote:
Slow disks will show up as higher I/Owait times. If your seeing 99% cpu usage then your likely looking at some other problem.
If you run top what are you seeing on the %Cpu(s) line?
On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
On Mon, Feb 8, 2016 at 2:53 PM, Alvin Starr alvin@netvel.net wrote:
You need to provide more information. 20% is what number. There are something like 6 numbers on that line.
Post commands and results of command outputs....
If you run top what are you seeing on the %Cpu(s) line?
http://i.hizliresim.com/NrmV9Y.png
On Mon, Feb 8, 2016 at 10:53 PM, Alvin Starr alvin@netvel.net wrote:
You need to provide more information. 20% is what number. There are something like 6 numbers on that line.
On 02/08/2016 02:56 PM, Gokan Atmaca wrote:
If you run top what are you seeing on the %Cpu(s) line?
%20
On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr alvin@netvel.net wrote:
Slow disks will show up as higher I/Owait times. If your seeing 99% cpu usage then your likely looking at some other problem.
If you run top what are you seeing on the %Cpu(s) line?
On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very expensive SAS drives. But this works only if the server in question occur. In this case, about 15 minutes. progress.
On Mon, Feb 8, 2016 at 9:13 PM, Digimer lists@alteeve.ca wrote:
On 08/02/16 02:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks..
I'm guessing you're using standard 7,200rpm platter drives? You'll need to share more information about your environment in order for us to provide useful feedback. Usually though, the answer is 'caching' and/or 'faster disks'.
-- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
Am 08.02.2016 um 22:25 schrieb Gokan Atmaca:
If you run top what are you seeing on the %Cpu(s) line?
That's not a CentOS system. You should probably consult the community providing support for your Debian or Ubuntu based system.
I see you run MySQL, so verify your database configuration against the discussion at
https://serverfault.com/questions/363355/io-wait-causing-so-much-slowdown-ex...
Alexander
Are the disk partitions properly aligned to 4k boundary on the host (and in the guests too) ?
See http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.... and this: http://unix.stackexchange.com/questions/247387/check-if-partitions-are-align...
On 2/8/2016 8:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks.. _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
Are the disk partitions properly aligned to 4k boundary on the host (and in the guests too) ?
There are 5 in total server. 32G ram. 2T r1 (soft) disk.
On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach zoltan@frombach.com wrote:
Are the disk partitions properly aligned to 4k boundary on the host (and in the guests too) ?
See http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.... and this: http://unix.stackexchange.com/questions/247387/check-if-partitions-are-align...
On 2/8/2016 8:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks.. _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
Using *top *and looki at *'wa' *value can tell you I/O wait time for each CPU Dont forget to press "*1*" to expand list of CPUs
Tasks: 501 total, 4 running, 497 sleeping, 0 stopped, 0 zombie Cpu0 : 31.9%us, 52.7%sy, 0.0%ni, 15.1%id, *0.0%wa*, 0.0%hi, 0.3%si, 0.0%st Cpu1 : 29.7%us, 7.6%sy, 0.0%ni, 62.1%id, *0.0%wa,* 0.0%hi, 0.7%si, 0.0%st
Also, there is handy tool called: *iotop *which can tell how much process writes and read. We can see on our 6Gpbs SATAIII interface with SSD disks, the interfaces is being maxed out with writes at ~500MBs
At the end 7.2k disks can be easily maxed out while running a few VMs so no surprise here.
Lastly, setup some monitoring for example munin, its quite handy :
http://demo.munin-monitoring.org/disk-day.html
On Mon, Feb 8, 2016 at 1:58 PM Gokan Atmaca linux.gokan@gmail.com wrote:
Are the disk partitions properly aligned to 4k boundary on the host (and
in
the guests too) ?
There are 5 in total server. 32G ram. 2T r1 (soft) disk.
On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach zoltan@frombach.com wrote:
Are the disk partitions properly aligned to 4k boundary on the host (and
in
the guests too) ?
See
http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index....
and this:
http://unix.stackexchange.com/questions/247387/check-if-partitions-are-align...
On 2/8/2016 8:12 PM, Gokan Atmaca wrote:
Hello
I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ?
Thanks.. _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
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Alexander Dalloz -
Alvin Starr -
Digimer -
Gokan Atmaca -
Marcin Figura -
NightLightHosts Admin -
Zoltan Frombach