Nothing but GlusterFS should be writing to bricks. Mount a client and
write there.
On 01/26/2015 01:38 PM, Tiago Santos wrote:
Right.
I have Brick1 being constantly written. But I have nothing writing on
Brick2. It just get "healed" data from Brick1.
This setup is still not in production, and there's no applications
using that data. I have rsyncs constantly updating Brick1 (bring data
from production servers), and then Gluster updates Brick2.
Which makes me wonder how may I be creating multiple replicas during a
split-brain.
It may be the case that, having a split-brain event, I may be updating
versions of the same file on Brick1 (only), and Gluster understands it
as different versions and things get confuse?
Anyways, while we talk I'm gonna run Joe's precious procedure on
split-brain recovery.
On Mon, Jan 26, 2015 at 7:23 PM, Joe Julian <[email protected]
<mailto:[email protected]>> wrote:
Mismatched GFIDs would happen if a file is created on multiple
replicas during a split-brain event. The GFID is assigned at file
creation.
On 01/26/2015 01:04 PM, A Ghoshal wrote:
Yep, so it is indeed a split-brain caused by a mismatch of the
trusted.gfid attribute.
Sadly, I don't know precisely what causes it. -Communication
loss might be one of the triggers. I am guessing the files
with the problem are dynamic, correct? In our setup (also
replica 2), communication is never a problem but we do see
this when one of the server takes a reboot. Maybe some obscure
and difficult to understand race between background self-heal
and the self heal daemon...
In any case, a normal procedure for split brain recovery would
work for you if you wish to get you files back in function.
It's easy to find on google. I use the instructions on Joe
Julian's blog page myself.
-----Tiago Santos <[email protected]
<mailto:[email protected]>> wrote: -----
=======================
To: A Ghoshal <[email protected] <mailto:[email protected]>>
From: Tiago Santos <[email protected]
<mailto:[email protected]>>
Date: 01/27/2015 02:11AM
Cc: gluster-users <[email protected]
<mailto:[email protected]>>
Subject: Re: [Gluster-users] Pretty much any operation
related to Gluster mounted fs hangs for a while
=======================
Oh, right!
Follow the outputs:
root@web3:/export/images1-1/brick# time getfattr -m . -d -e hex
templates/assets/prod/temporary/13/user_1339200.png
# file: templates/assets/prod/temporary/13/user_1339200.png
trusted.afr.site-images-client-0=0x000000000000000400000000
trusted.afr.site-images-client-1=0x000000020000000900000000
trusted.gfid=0x10e5894c474a4cb1898b71e872cdf527
real 0m0.024s
user 0m0.001s
sys 0m0.001s
root@web4:/export/images2-1/brick# time getfattr -m . -d -e hex
templates/assets/prod/temporary/13/user_1339200.png
# file: templates/assets/prod/temporary/13/user_1339200.png
trusted.afr.site-images-client-0=0x000000000000000000000000
trusted.afr.site-images-client-1=0x000000000000000000000000
trusted.gfid=0xd02f14fcb6724ceba4a330eb606910f3
real 0m0.003s
user 0m0.000s
sys 0m0.006s
Not sure exactly what that means. I'm googling, and would
appreciate if you
guys can bring some light.
Thanks!
--
Tiago
On Mon, Jan 26, 2015 at 6:16 PM, A Ghoshal <[email protected]
<mailto:[email protected]>> wrote:
Actually you ran getfattr on the volume - which is why the
requisite
extended attributes never showed up...
Your bricks are mounted elsewhere.
/exports/images1-1/brick, and exports/images2-1/brick
Btw, what version of Linux do you use? And, are the files
you observe the
input/output errors on soft-links?
-----Tiago Santos <[email protected]
<mailto:[email protected]>> wrote: -----
=======================
To: A Ghoshal <[email protected] <mailto:[email protected]>>
From: Tiago Santos <[email protected]
<mailto:[email protected]>>
Date: 01/27/2015 12:20AM
Cc: gluster-users <[email protected]
<mailto:[email protected]>>
Subject: Re: [Gluster-users] Pretty much any operation
related to Gluster
mounted fs hangs for a while
=======================
Thanks for you input, Anirban.
I ran the commands on both servers, with the following
results:
root@web3:/var/www/site-images# time getfattr -m . -d -e hex
templates/assets/prod/temporary/13/user_1339200.png
real 0m34.524s
user 0m0.004s
sys 0m0.000s
root@web4:/var/www/site-images# time getfattr -m . -d -e hex
templates/assets/prod/temporary/13/user_1339200.png
getfattr:
templates/assets/prod/temporary/13/user_1339200.png:
Input/output
error
real 0m11.315s
user 0m0.001s
sys 0m0.003s
root@web4:/var/www/site-images# ls
templates/assets/prod/temporary/13/user_1339200.png
ls: cannot access
templates/assets/prod/temporary/13/user_1339200.png:
Input/output error
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--
*Tiago Santos*
MustHaveMenus.com
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