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Re: [Gluster-devel] AFR between two bricks over 3000 miles
From: |
Krishna Srinivas |
Subject: |
Re: [Gluster-devel] AFR between two bricks over 3000 miles |
Date: |
Tue, 11 Mar 2008 11:23:32 +0530 |
Hi Nathan,
We are working on a solution, it will take time. Will let you know
after it is done, if it is not done with in 2 weeks please follow it
up with us.
Regards
Krishna
On Mon, Mar 10, 2008 at 5:19 AM, <address@hidden> wrote:
>
> Any update on this? Would love to be able to use gluster between east and
> west coast sites.
>
>
>
> ><>
> Nathan Stratton
> nathan at robotics.net
> http://www.robotics.net
>
>
>
> On Tue, 4 Mar 2008, Anand Avati wrote:
>
> > 2008/3/4, address@hidden <address@hidden>:
> >>
> >>
> >> I tried moving this to server side and that did not help. The 74 ms delay
> >> between the sites appears to make gluster unusable, even tho there is 100
> >> meg of free capacity. Any plans to background some of the back and forth
> >> communication so that if you use write-behind you can get close to local
> >> speed on writes?
> >
> >
> > currently write-behind works for only write() calls. I too am seeing the
> > issue of the highest latency subvolume becoming the bottleneck for
> > operations while it is not unfair to expect application performance at the
> > fastest subvolume speed. Will discuss with Krishna about the impact and
> side
> > effects and let you know what we come up with.
> >
> > avati
> >
> >
> >
> >> <>
> >> Nathan Stratton
> >> nathan at robotics.net
> >> http://www.robotics.net
> >>
> >>
> >> On Mon, 3 Mar 2008, address@hidden wrote:
> >>
> >>> On Mon, 3 Mar 2008, Anand Avati wrote:
> >>>
> >>>> the bottleneck seems to be create/open which is synchronous over all
> >>>> subvolumes. do you have numbers without involving the remote site/afr ?
> >>>
> >>> Just mounted nyc rather then mirror and that cut the time to .076 sec vs
> >>> local .01 sec.
> >>>
> >>> This is a 100 meg link between NYC and SJC and only transferring 748K.
> >> My
> >>> guess is even if we had a full gig link between the two we would have
> >> the
> >>> same problem. A message sent from NYC to SJC will still take 60ms to fly
> >>> across the country. So if you have a lot of messages flying back and
> >> forth
> >>> waiting for data to be written you will have this problem.
> >>>
> >>> Another clue is that it takes 27 sec just to rm -fr the files! If I
> >> moved afr
> >>> from the client to the server would that help?
> >>>
> >>> address@hidden glusterfs]# time cp -r /etc/sysconfig/ /share/mirror
> >>>
> >>> real 0m0.076s
> >>> user 0m0.000s
> >>> sys 0m0.007s
> >>> address@hidden glusterfs]# time cp -r /etc/sysconfig/ /share/
> >>>
> >>> real 0m0.010s
> >>> user 0m0.001s
> >>> sys 0m0.006s
> >>> address@hidden glusterfs]#
> >>>
> >>> With mirror mounted (sjc and nyc up):
> >>>
> >>> address@hidden glusterfs]# time cp -r /etc/sysconfig/ /share/mirror
> >>>
> >>> real 0m52.195s
> >>> user 0m0.000s
> >>> sys 0m0.001s
> >>>
> >>> address@hidden glusterfs]# time rm -fr /share/mirror/*
> >>>
> >>> real 0m27.030s
> >>> user 0m0.000s
> >>> sys 0m0.002s
> >>>
> >>>> <>
> >>> Nathan Stratton
> >>> nathan at robotics.net
> >>> http://www.robotics.net
> >>>
> >>
> >
> >
> >
> > --
> > If I traveled to the end of the rainbow
> > As Dame Fortune did intend,
> > Murphy would be there to tell me
> > The pot's at the other end.
> >
>
>
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> address@hidden
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>
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, Krishna Srinivas, 2008/03/01
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, Krishna Srinivas, 2008/03/01
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/01
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, Anand Avati, 2008/03/03
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/03
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/03
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, Anand Avati, 2008/03/03
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/09
- Re: [Gluster-devel] AFR between two bricks over 3000 miles,
Krishna Srinivas <=
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/25
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, Krishna Srinivas, 2008/03/27
- Re: [Gluster-devel] AFR between two bricks over 3000 miles, nathan, 2008/03/27