Is there a way to nice the IO on a process such as dd?
If not, what could be a way to control the IO level of
such a process from bogging down a server to severely.
Thanks,
jlc
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Joseph L. Casale ha scritto:
> Is there a way to nice the IO on a process such as dd?
> If not, what could be a way to control the IO level of
> such a process from bogging down a server to severely.
>
As I was told few days ago you cold nice the whole process, eg.
nice 19 if=/xxx of=/xxx bs=nnn
Lorenzo Quatrini ha scritto:
> Joseph L. Casale ha scritto:
>> Is there a way to nice the IO on a process such as dd?
>> If not, what could be a way to control the IO level of
>> such a process from bogging down a server to severely.
>>
>
> As I was told few days ago you cold nice the whole proces
On Tuesday 02 September 2008, Joseph L. Casale wrote:
> Is there a way to nice the IO on a process such as dd?
> If not, what could be a way to control the IO level of
> such a process from bogging down a server to severely.
There is ionice (assuming CentOS-5) in the util-linux package. It's by no
Lorenzo Quatrini wrote:
Lorenzo Quatrini ha scritto:
nice 19 dd if=/xxx of=/xxx bs=nnn
^^
probably
- nice 19 dd if=/xxx of=/xxx bs=nnn
+ nice -n 19dd if=/xxx of=/xxx bs=nnn
--
Best Wishes,
PAIX-UANIC | SK3929-RIPE
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Lorenzo Quatrini wrote:
> As I was told few days ago you cold nice the whole process, eg.
>
> nice 19 if=/xxx of=/xxx bs=nnn
>
> This should give all the other process priority over dd
nice doesn't really do anything with respect to I/O.
The best way to control I/O in this manor is to physically
>nice doesn't really do anything with respect to I/O.
Yes I tried it and it never made a diff from one end of
the spectrum to the other:)
>The best way to control I/O in this manor is to physically
>isolate it from the rest of the system(be it on a different
>controller connected to different dis
On Tue, 2008-09-02 at 16:28 +0200, Lorenzo Quatrini wrote:
> Joseph L. Casale ha scritto:
> > Is there a way to nice the IO on a process such as dd?
> > If not, what could be a way to control the IO level of
> > such a process from bogging down a server to severely.
> >
>
> As I was told few day
Peter Kjellstrom wrote:
> On Tuesday 02 September 2008, Joseph L. Casale wrote:
> > Is there a way to nice the IO on a process such as dd?
> > If not, what could be a way to control the IO level of
> > such a process from bogging down a server to severely.
>
> There is ionice (assuming CentOS-5) i
>If that doesn't do it for you then maybe choosing a different
>scheduler then cfq can help. Something like 'deadline' may
>work better for the workload.
>
>AFAIK ionice will only work with the cfq scheduler for now.
Appreciate that info, I have just been reading about the difference but
cant say
On Tue, Sep 2, 2008 at 9:51 AM, Joseph L. Casale
<[EMAIL PROTECTED]> wrote:
>
> Appreciate that info, I have just been reading about the difference but
> cant say I understand in real life what the difference between deadline
> versus cfq is. I will try changing it on the fly and running my tests.
On Tue, 2 Sep 2008 10:21:31 -0700
MHR <[EMAIL PROTECTED]> wrote:
> On Tue, Sep 2, 2008 at 9:51 AM, Joseph L. Casale
> <[EMAIL PROTECTED]> wrote:
> >
> > Appreciate that info, I have just been reading about the difference but
> > cant say I understand in real life what the difference between deadli
>Here's a decent, short write up on them:
>http://www.redhat.com/magazine/008jun05/features/schedulers/
Yup,
I found that but I remember stumbling across this issue when reading about Xen
in Todd Deshane's book and finally found the article I came across.
http://www.linuxjournal.com/article/6931
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