[Gluster-users] glusterfs under high load failing?

[Roman]

Sure.
I'll let it to run for this night .

2014-10-13 19:19 GMT+03:00 Pranith Kumar Karampuri <pkarampu at redhat.com>:

>  hi Roman,
>      Do you think we can run this test again? this time, could you enable
> 'gluster volume profile <volname> start', do the same test. Provide output
> of 'gluster volume profile <volname> info' and logs after the test?
>
> Pranith
>
> On 10/13/2014 09:45 PM, Roman wrote:
>
> Sure !
>
>  root at stor1:~# gluster volume info
>
>  Volume Name: HA-2TB-TT-Proxmox-cluster
> Type: Replicate
> Volume ID: 66e38bde-c5fa-4ce2-be6e-6b2adeaa16c2
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: stor1:/exports/HA-2TB-TT-Proxmox-cluster/2TB
> Brick2: stor2:/exports/HA-2TB-TT-Proxmox-cluster/2TB
> Options Reconfigured:
> nfs.disable: 0
> network.ping-timeout: 10
>
>  Volume Name: HA-WIN-TT-1T
> Type: Replicate
> Volume ID: 2937ac01-4cba-44a8-8ff8-0161b67f8ee4
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: stor1:/exports/NFS-WIN/1T
> Brick2: stor2:/exports/NFS-WIN/1T
> Options Reconfigured:
> nfs.disable: 1
> network.ping-timeout: 10
>
>
>
> 2014-10-13 19:09 GMT+03:00 Pranith Kumar Karampuri <pkarampu at redhat.com>:
>
>>  Could you give your 'gluster volume info' output?
>>
>> Pranith
>>
>> On 10/13/2014 09:36 PM, Roman wrote:
>>
>>  Hi,
>>
>>  I've got this kind of setup (servers run replica)
>>
>>
>>  @ 10G backend
>> gluster storage1
>> gluster storage2
>> gluster client1
>>
>>  @1g backend
>> other gluster clients
>>
>>  Servers got HW RAID5 with SAS disks.
>>
>>  So today I've desided to create a 900GB file for iscsi target that will
>> be located @ glusterfs separate volume, using dd (just a dummy file filled
>> with zeros, bs=1G count 900)
>> For the first of all the process took pretty lots of time, the writing
>> speed was 130 MB/sec (client port was 2 gbps, servers ports were running @
>> 1gbps).
>> Then it reported something like "endpoint is not connected" and all of my
>> VMs on the other volume started to give me IO errors.
>> Servers load was around 4,6 (total 12 cores)
>>
>>  Maybe it was due to timeout of 2 secs, so I've made it a big higher, 10
>> sec.
>>
>>  Also during the dd image creation time, VMs very often reported me that
>> their disks are slow like
>>
>> WARNINGs: Read IO Wait time is -0.02 (outside range [0:1]).
>>
>> Is 130MB /sec is the maximum bandwidth for all of the volumes in total?
>> That why would we need 10g backends?
>>
>> HW Raid local speed is 300 MB/sec, so it should not be an issue. any
>> ideas or mby any advices?
>>
>>
>>  Maybe some1 got optimized sysctl.conf for 10G backend?
>>
>> mine is pretty simple, which can be found from googling.
>>
>>
>>  just to mention: those VM-s were connected using separate 1gbps
>> intraface, which means, they should not be affected by the client with 10g
>> backend.
>>
>>
>>  logs are pretty useless, they just say  this during the outage
>>
>>
>>  [2014-10-13 12:09:18.392910] W [client-handshake.c:276:client_ping_cbk]
>> 0-HA-2TB-TT-Proxmox-cluster-client-0: timer must have expired
>>
>> [2014-10-13 12:10:08.389708] C
>> [client-handshake.c:127:rpc_client_ping_timer_expired]
>> 0-HA-2TB-TT-Proxmox-cluster-client-0: server 10.250.0.1:49159 has not
>> responded in the last 2 seconds, disconnecting.
>>
>> [2014-10-13 12:10:08.390312] W [client-handshake.c:276:client_ping_cbk]
>> 0-HA-2TB-TT-Proxmox-cluster-client-0: timer must have expired
>>  so I decided to set the timout a bit higher.
>>
>>  So it seems to me, that under high load GlusterFS is not useable? 130
>> MB/s is not that much to get some kind of timeouts or makeing the systme so
>> slow, that VM-s feeling themselves bad.
>>
>>  Of course, after the disconnection, healing process was started, but as
>> VM-s lost connection to both of servers, it was pretty useless, they could
>> not run anymore. and BTW, when u load the server with such huge job (dd of
>> 900GB), healing process goes soooooo slow :)
>>
>>
>>
>>  --
>> Best regards,
>> Roman.
>>
>>
>>  _______________________________________________
>> Gluster-users mailing listGluster-users at gluster.orghttp://supercolony.gluster.org/mailman/listinfo/gluster-users
>>
>>
>>
>
>
>  --
> Best regards,
> Roman.
>
>
>


-- 
Best regards,
Roman.
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