[Pacemaker] [Question and Problem] In vSphere5.1 environment, IO blocking of pengine occurs at the time of shared disk trouble for a long time.

[Andrew Beekhof]

On 15/05/2013, at 3:50 PM, Vladislav Bogdanov <bubble at hoster-ok.com> wrote:

> 15.05.2013 08:23, Andrew Beekhof wrote:
>> 
>> On 15/05/2013, at 3:11 PM, renayama19661014 at ybb.ne.jp wrote:
>> 
>>> Hi Andrew,
>>> 
>>> Thank you for comments.
>>> 
>>>>> The guest located it to the shared disk.
>>>> 
>>>> What is on the shared disk?  The whole OS or app-specific data (i.e. nothing pacemaker needs directly)?
>>> 
>>> Shared disk has all the OS and the all data.
>> 
>> Oh. I can imagine that being problematic.
>> Pacemaker really isn't designed to function without disk access.
>> 
>> You might be able to get away with it if you turn off saving PE files to disk though.
> 
> I store CIB and PE files to tmpfs, and sync them to remote storage
> (CIFS) with lsyncd level 1 config (I may share it on request). It copies
> critical data like cib.xml, and moves everything else, symlinking it to
> original place. The same technique may apply here, but with local fs
> instead of cifs.
> 
> Btw, the following patch is needed for that, otherwise pacemaker
> overwrites remote files instead of creating new ones on tmpfs:
> 
> --- a/lib/common/xml.c  2011-02-11 11:42:37.000000000 +0100
> +++ b/lib/common/xml.c  2011-02-24 15:07:48.541870829 +0100
> @@ -529,6 +529,8 @@ write_file(const char *string, const char *filename)
>         return -1;
>     }
> 
> +    unlink(filename);

Seems like it should be safe to include for normal operation.

> +
>     file_output_strm = fopen(filename, "w");
>     if (file_output_strm == NULL) {
>         crm_perror(LOG_ERR, "Cannot open %s for writing", filename);
> 
> 
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