[Gluster-users] A year's worth of Gluster

[Andrew Smith]

QDR Infiniband has a max theoretical input of 40Gbits, or about 4GB/s. 
My LSI controller RAID controllers typically deliver about 0.5-1.0 GB/s
for direct disk access.

I have tested it many ways. I typically start jobs on many clients and 
measure the total network bandwidth on the servers by monitoring the
totals in /proc/net/dev or just count the bytes on the clients. I can’t
get more than about 300MB/s from each server. With a single job on 
a single client, I can’t get more than about 100-150MB/s. 

On Dec 7, 2014, at 9:15 PM, Franco Broi <franco.broi at iongeo.com> wrote:

> 
> Our theoretical peak throughput is about 4Gbytes/sec or 4 x 10Gbits/Sec,
> you can see from the graph that the maximum recorded is 3.6GB/Sec. This
> was probably during periods of large sequential IO.
> 
> We have a small cluster of clients (10) with 10Gbit ethernet but the
> majority of our machines (130) have gigabit. The throughput maximum for
> the 10Gbit connected machines was just over 3GBytes/Sec with individual
> machines recording about 800MB/Sec.
> 
> We can easily saturate our 10Gbit links on the servers as each JBOD is
> capable of better than 500MB/Sec but with mixed sequential/random access
> it seems like a good compromise.
> 
> We have another 2 server Gluster system with the same specs and we get
> 1.8GB/Sec reads and 1.1GB/Sec writes.
> 
> What are you using to measure your throughput?
> 
> On Sun, 2014-12-07 at 20:52 -0500, Andrew Smith wrote: 
>> I have a similar system with 4 nodes and 2 bricks per node, where 
>> each brick is a single large filesystem (4TB x 24 RAID 6). The
>> computers are all on QDR Infinband with Gluster using IPOIB. I
>> have a cluster of Infiniband clients that access the data on the
>> servers. I can only get about 1.0 to 1.2 GB/s throughput with my
>> system though. Can you tell us the peak throughput that you are
>> getting. I just don’t have a sense of what I should expect from 
>> my system. A similar Luster setup could achieve 2-3 GB/s, which
>> I attributed to the fact that it didn’t use IPOIB, but instead used
>> RDMA. I’d really like to know if I am wrong here and there is 
>> some configuration I can tweak to make things faster. 
>> 
>> Andy
>> 
>> On Dec 7, 2014, at 8:43 PM, Franco Broi <franco.broi at iongeo.com> wrote:
>> 
>>> On Fri, 2014-12-05 at 14:22 +0000, Kiebzak, Jason M. wrote: 
>>>> May I ask why you chose to go with 4 separate bricks per server rather than one large brick per server?
>>> 
>>> Each brick is a JBOD with 16 disks running RAIDZ2. Just seemed more
>>> logical to keep the bricks and ZFS filesystems confined to physical
>>> hardware units, ie I could disconnect a brick and move it to another
>>> server.
>>> 
>>>> 
>>>> Thanks
>>>> Jason
>>>> 
>>>> -----Original Message-----
>>>> From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Franco Broi
>>>> Sent: Thursday, December 04, 2014 7:56 PM
>>>> To: gluster-users at gluster.org
>>>> Subject: [Gluster-users] A year's worth of Gluster
>>>> 
>>>> 
>>>> 1 DHT volume comprising 16 50TB bricks spread across 4 servers. Each server has 10Gbit Ethernet.
>>>> 
>>>> Each brick is a ZOL RADIZ2 pool with a single filesystem.
>>> 
>>> 
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>> 
> 
>