[Gluster-users] AFR performance killer

[Shehjar Tikoo]

Marko wrote:
> All Xen domains share same physical volume but have theier uniqe
> logical volume.
Please be a bit more specific about the volume. Is it a single large
disk or a bunch of RAIDx disks?

Thanks
Shehjar

> So, yes I'd expect performance degradation becouse of that (that is
> why test DHT2 performed better than DHT4). But I cant expect
> performance drop when I use a performance "booster".
> 
> Regards, Marko
> 
> Shehjar Tikoo wrote:
>> Marko wrote:
>>> Hi Shehjar,
>>> 
>>> Answers: 1.) Filesystem is default ext3 mounted with
>>> "defaults,noatime"
>> 
>> I see that each server, i.e. iscsi1 and iscsi2, has /srv/gluster as
>> the backend in their corresponding xen domains, but did the xen
>> domains also share the same disks/storage device?
>> 
>> Thanks Shehjar
>> 
>>> 2.) I think it how it was becouse I always put io-threads as
>>> top(or near top) translator.  Iin TEST5 "iot" can be ignored. 3.)
>>>  Server(brick) iscsi2 was also client on which I was running the
>>> test and it was also a Xen guest.
>>> 
>>> One more thing I'd like to point out. In documentation I miss 
>>> information of best practices which translators should be put 
>>> before/after other translators. Example: should one put
>>> io-threads before or after io-cache? What does it mean if you
>>> configure either way.
>>> 
>>> Regards, Marko
>>> 
>>> Shehjar Tikoo wrote:
>>>> Marko wrote:
>>>>> this document is made for my personal reference so it's a
>>>>> little raw.
>>>>> 
>>>>> 
>>>> 
>>>> A few questions:
>>>> 
>>>> 1. What was the on-disk file system and the disk organization
>>>> under the file system?
>>>> 
>>>> 2. In the TEST5 volfile, the volume iot is dangling. Is that
>>>> how it actually was during the test or was it interposed
>>>> between volume wb and volume AFR?
>>>> 
>>>>>> On Wed, Apr 8, 2009 at 6:18 PM, Marko <gluster at sopca.com 
>>>>>> <mailto:gluster at sopca.com>> wrote:
>>>>>> 
>>>>>> Hello,
>>>>>> 
>>>>>> To clearify: * im testing with gluisterfs-2.0.0rc7 * all
>>>>>> bricks are on same physical server(Xen guests). It's a
>>>>>> testing environment.
>>>> 
>>>> Were the client side tests( i.e., both the test program like 
>>>> make-many-files and the corresponding glusterfs client..) also
>>>>  running in a Xen guest?
>>>> 
>>>> Thanks Shehjar
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 
>