[Gluster-users] Gluster Community Newsletter, October 2016

[Amye Scavarda]

Important happenings for Gluster this month:


A great Gluster Developer Summit this month, thanks to all who
participated.

Find all of our recorded talks with slides at:

https://www.youtube.com/user/GlusterCommunity/playlists

http://www.slideshare.net/GlusterCommunity/

Changes to the Community Meeting

We’re trying out something new for a few weeks, we’ve removed our updates
from the Community Meeting and made it an open floor instead.

Have something on your mind?

https://www.gluster.org/community/ has details to join the Community
Meeting if you’ve never come by. We’d love to have you!

Upcoming:

Our annual users survey will come out in November, we’ll give it until
mid-December for responses and post the results. What else would you want
to see on the user survey?



>From the mailing lists:

gluster-users:

Lindsay Mathieson asks about healing delays:
http://www.gluster.org/pipermail/gluster-users/2016-October/028561.html

Pranith Kumar Karampuri asks what application workloads are too slow for
you on gluster?
http://www.gluster.org/pipermail/gluster-users/2016-October/028570.html

gluster-devel:

Hari Gowtham provides new commands for supporting add/remove brick and
rebalance on tiered volume

http://www.gluster.org/pipermail/gluster-devel/2016-October/051104.html

Jeff Darcy posts on Memory-management ideas

http://www.gluster.org/pipermail/gluster-devel/2016-October/051118.html

New style community meetings - No more status updates from Kaushal M

http://www.gluster.org/pipermail/gluster-devel/2016-October/051227.html

Notes from Gluster Developer Summit from Amye Scavarda

http://www.gluster.org/pipermail/gluster-devel/2016-October/051255.html

gluster-infra:

Move of the formicary server to the new space

 Michael
Scherer

http://www.gluster.org/pipermail/gluster-infra/2016-October/002905.html

Top Five: Niels de Vos, Pranith Kumar K,  Kaushal M,  Aravinda VK,  Atin
Mukherjee

Calls for Papers:

FOSDEM: https://fosdem.org/2017/news/2016-07-20-call-for-participation/ -
February 4-5, 2017 - Rotating deadlines, November 8th for Storage DevRoom
DevConf - http://www.devconf.cz/ - Jan 27-29 --  November 11th 2016
Vault: http://events.linuxfoundation.org/events/vault/program/cfp -
 December 17th


-- 
Amye Scavarda | a...@redhat.com | Gluster Community Lead
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Re: [Gluster-users] Performance

[Lindsay Mathieson]

On 26/10/2016 2:50 AM, Service Mail wrote:
3x zfs raidz2 servers with a single gluster 3.8 replicated volume 
across a 10G network




SSD slog? they make a big difference for sync writes


If you have no slog try with zfs "sync=disabled" on all three pools. Not 
recommended for  production, but would like to see the results.


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Re: [Gluster-users] Performance

[Alex Crow]

I last used GlusterFS around early 3.6. I could get great results for streaming 
large files. I was seeing up to 700MB/s with a DD test. Small file/metadata 
access wasn't right for our use, but for VMs it should be fine with a bit of 
tuning.

On 31 October 2016 15:33:06 GMT+00:00, Joe Julian  wrote:
>On 10/31/2016 08:29 AM, Alastair Neil wrote:
>> What version of Gluster?  Are you using glusterfs or nfs mount?  Any 
>> other traffic on the network, is the cluster quiescent apart from
>your 
>> dd test?
>>
>
>What type of volume?
>
>> It does seem slow.  I have a three server cluster, using straight xfs
>
>> over 10G with Gluster 3.8 and glusterfs mounts and I see:
>>
>> [root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M 
>> count=1024; sync
>> 1024+0 records in
>> 1024+0 records out
>> 1073741824 bytes (1.1 GB) copied, 11.3322 s, 94.8 MB/s
>> [root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M 
>> count=10240; sync
>> 10240+0 records in
>> 10240+0 records out
>> 10737418240 bytes (11 GB) copied, 117.854 s, 91.1 MB/s
>>
>> this is on a cluster serving 5 ovirt nodes and about 60 running VMs.
>>
>>
>>
>> On 25 October 2016 at 12:50, Service Mail > > wrote:
>>
>> Hello,
>>
>> I have the following setup:
>>
>> 3x zfs raidz2 servers with a single gluster 3.8 replicated volume
>> across a 10G network
>>
>> Everything is working fine however performance looks very poor to
>me:
>>
>>
>> root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M
>> count=1024; sync
>> 1024+0 records in
>> 1024+0 records out
>> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 32.1786 s, 33.4 MB/s
>>
>> root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M
>> count=10240; sync
>> 10240+0 records in
>> 10240+0 records out
>> 10737418240 bytes (11 GB, 10 GiB) copied, 301.563 s, 35.6 MB/s
>>
>> Are those reading normal? Where should I look to increase
>performance?
>>
>> Thanks,
>>
>> Ciclope
>>
>>
>>
>>
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>>
>>
>>
>>
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>
>
>
>
>
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Re: [Gluster-users] Performance

[Joe Julian]

On 10/31/2016 08:29 AM, Alastair Neil wrote:
What version of Gluster?  Are you using glusterfs or nfs mount?  Any 
other traffic on the network, is the cluster quiescent apart from your 
dd test?




What type of volume?

It does seem slow.  I have a three server cluster, using straight xfs 
over 10G with Gluster 3.8 and glusterfs mounts and I see:


[root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M 
count=1024; sync

1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 11.3322 s, 94.8 MB/s
[root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M 
count=10240; sync

10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 117.854 s, 91.1 MB/s

this is on a cluster serving 5 ovirt nodes and about 60 running VMs.



On 25 October 2016 at 12:50, Service Mail > wrote:


Hello,

I have the following setup:

3x zfs raidz2 servers with a single gluster 3.8 replicated volume
across a 10G network

Everything is working fine however performance looks very poor to me:


root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M
count=1024; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 32.1786 s, 33.4 MB/s

root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M
count=10240; sync
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB, 10 GiB) copied, 301.563 s, 35.6 MB/s

Are those reading normal? Where should I look to increase performance?

Thanks,

Ciclope




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Re: [Gluster-users] Performance

[Alastair Neil]

What version of Gluster?  Are you using glusterfs or nfs mount?  Any other
traffic on the network, is the cluster quiescent apart from your dd test?

It does seem slow.  I have a three server cluster, using straight xfs over
10G with Gluster 3.8 and glusterfs mounts and I see:

[root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M
count=1024; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 11.3322 s, 94.8 MB/s
[root@sb-c 192.168.10.49:VM]# sync; dd if=/dev/zero of=nfsp2 bs=1M
count=10240; sync
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 117.854 s, 91.1 MB/s

this is on a cluster serving 5 ovirt nodes and about 60 running VMs.



On 25 October 2016 at 12:50, Service Mail  wrote:

> Hello,
>
> I have the following setup:
>
> 3x zfs raidz2 servers with a single gluster 3.8 replicated volume across a
> 10G network
>
> Everything is working fine however performance looks very poor to me:
>
>
> root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M count=1024;
> sync
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 32.1786 s, 33.4 MB/s
>
> root@Client:/test_mount# sync; dd if=/dev/zero of=nfsp2 bs=1M
> count=10240; sync
> 10240+0 records in
> 10240+0 records out
> 10737418240 bytes (11 GB, 10 GiB) copied, 301.563 s, 35.6 MB/s
>
> Are those reading normal? Where should I look to increase performance?
>
> Thanks,
>
> Ciclope
>
>
>
>
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[Gluster-users] Quorum parameters with arbiter brick

[Beard Lionel (BOSTON-STORAGE)]

Hi,

I'm currently setting up a volume with an arbiter brick.
Are these option values normal in this configuration:
cluster.quorum-type none
cluster.quorum-count(null)
cluster.server-quorum-type  off
cluster.server-quorum-ratio 0
cluster.quorum-readsno

I was expecting to have at least quorum-type = auto (as explained in gluster 
docs).
However, I have checked and quorum seems to be applied: when 1 brick + arbiter 
are off, volume is read-only.

I have tested with volume creation from scratch and also when converting a 
replica 2 volume to arbiter.

Thanks.

Regards,
Lionel



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