Re: [Gluster-users] What is it with trusted.io-stats-dump?

2017-11-13 Thread Jeevan Patnaik 
Hi,

Thanks. Now I understand :)

On Nov 13, 2017 1:06 PM, "Krutika Dhananjay"  wrote:

> trusted.io-stats-dump is a virtual (not physical) extended attribute.
> The code is written in a way that a request to set trusted.io-stats-dump
> gets bypassed at the io-stats translator layer on the stack and
> there it gets converted into the action of dumping the statistics into the
> provided output file path.
> See io_stats_setxattr() implementation in io-stats.c for more details.
>
> HTH,
> Krutika
>
> On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik 
> wrote:
>
>> Hi,
>>
>> I am trying to understand how the extended attribute
>> trusted.io-stats-dump works.
>>
>> setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-stats-pre.txt
>> /mnt/gluster/gv0_glusterfs
>>
>> I can see that the io-stats-pre.txt is created. But how and what happened
>> in the background?
>>
>> And why I can't I see the attribute with getfattr again?
>>
>> getfattr -dm- /mnt/gluster/gv0_glusterfs
>> # file: mnt/gluster/gv0_glusterfs
>> trusted.glusterfs.dht.commithash="3480667945 <03480%20667%20945>"
>>
>> Regards,
>> Jeevan.
>>
>> ___
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>> Gluster-users@gluster.org
>> http://lists.gluster.org/mailman/listinfo/gluster-users
>>
>
>
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Re: [Gluster-users] What is it with trusted.io-stats-dump?

2017-11-13 Thread Amar Tumballi 
On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik 
wrote:

> Hi,
>
> I am trying to understand how the extended attribute trusted.io-stats-dump
> works.
>
> setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-stats-pre.txt
> /mnt/gluster/gv0_glusterfs
>
> I can see that the io-stats-pre.txt is created. But how and what happened
> in the background?
>
> And why I can't I see the attribute with getfattr again?
>
>
That is because 'trusted.io-stats-dump' is one of the many Virtual key
GlusterFS handles.

As GlusterFS is a filesystem, the way to interact with it is through system
calls. GlusterFS has some options for debugging in-built using 'setxattr()'
and 'getxattr()' syscall interface, and they are called 'virtual keys'.

Regards,
Amar



> getfattr -dm- /mnt/gluster/gv0_glusterfs
> # file: mnt/gluster/gv0_glusterfs
> trusted.glusterfs.dht.commithash="3480667945"
>
> Regards,
> Jeevan.
>
> ___
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> Gluster-users@gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>



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Re: [Gluster-users] What is it with trusted.io-stats-dump?

2017-11-13 Thread Krutika Dhananjay 
trusted.io-stats-dump is a virtual (not physical) extended attribute.
The code is written in a way that a request to set trusted.io-stats-dump
gets bypassed at the io-stats translator layer on the stack and
there it gets converted into the action of dumping the statistics into the
provided output file path.
See io_stats_setxattr() implementation in io-stats.c for more details.

HTH,
Krutika

On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik 
wrote:

> Hi,
>
> I am trying to understand how the extended attribute trusted.io-stats-dump
> works.
>
> setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-stats-pre.txt
> /mnt/gluster/gv0_glusterfs
>
> I can see that the io-stats-pre.txt is created. But how and what happened
> in the background?
>
> And why I can't I see the attribute with getfattr again?
>
> getfattr -dm- /mnt/gluster/gv0_glusterfs
> # file: mnt/gluster/gv0_glusterfs
> trusted.glusterfs.dht.commithash="3480667945"
>
> Regards,
> Jeevan.
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>
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Re: [Gluster-users] What is it with trusted.io-stats-dump?

2017-11-13 Thread Jeevan Patnaik 
Hi,

>From strace, I can see the system calls setxattr and getxattr.

Two things I don't understand is:

1. how does the file got created so quickly, from where it read the stats.
2.why is the added attribute missing if I check with getfattr?

Regards,
Jeevan.




On Nov 13, 2017 12:40 PM, "Amar Tumballi"  wrote:



On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik 
wrote:

> Hi,
>
> I am trying to understand how the extended attribute trusted.io-stats-dump
> works.
>
> setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-stats-pre.txt
> /mnt/gluster/gv0_glusterfs
>
> I can see that the io-stats-pre.txt is created. But how and what happened
> in the background?
>
> And why I can't I see the attribute with getfattr again?
>
>
That is because 'trusted.io-stats-dump' is one of the many Virtual key
GlusterFS handles.

As GlusterFS is a filesystem, the way to interact with it is through system
calls. GlusterFS has some options for debugging in-built using 'setxattr()'
and 'getxattr()' syscall interface, and they are called 'virtual keys'.

Regards,
Amar



> getfattr -dm- /mnt/gluster/gv0_glusterfs
> # file: mnt/gluster/gv0_glusterfs
> trusted.glusterfs.dht.commithash="3480667945 <03480%20667%20945>"
>
> Regards,
> Jeevan.
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>



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[Gluster-users] What is it with trusted.io-stats-dump?

2017-11-12 Thread Jeevan Patnaik 
Hi,

I am trying to understand how the extended attribute trusted.io-stats-dump
works.

setfattr -n trusted.io-stats-dump -v
/tmp/gluster_perf_stats/io-stats-pre.txt /mnt/gluster/gv0_glusterfs

I can see that the io-stats-pre.txt is created. But how and what happened
in the background?

And why I can't I see the attribute with getfattr again?

getfattr -dm- /mnt/gluster/gv0_glusterfs
# file: mnt/gluster/gv0_glusterfs
trusted.glusterfs.dht.commithash="3480667945"

Regards,
Jeevan.
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