[Gluster-users] stripped volume in 3.4.0qa5 with horrible read performance

[samuel]

Done.

https://bugzilla.redhat.com/show_bug.cgi?id=888174

While testing the system, we found 3.3.0 enables stripped-replicated
volumes and seems to offer a "right" read behaviour in some tests.

Thanks in advance and, please, contact me in case I can offer further help.

Best regards,
Samuel.

On 17 December 2012 16:20, John Mark Walker <johnmark at redhat.com> wrote:

> Please file a bug. There might be time to fix read performance before the
> 1st beta release.
>
> -JM
>
>
> ------------------------------
>
> Dear folks,
>
> I've been tried to use replicated stripped volumes with 3.3.
> unsuccessfully due to https://bugzilla.redhat.com/show_bug.cgi?id=861423and I then proceed to try 3.4.0qa5. I then find out that the bug was solved
> and I could use replicated stripped volume with the new version. Amazingly,
> write performance was quite astonishing.
>
> The problem I'm facing now is in the read process: It's horribly slow.
> When I open a file to edit using the gluster native client, it takes a few
> seconds and sometimes I got an error refering to file has been modified
> while I was editing it. There's a ruby application reading the files and I
> got continuously timeout errors.
>
> I'm using 4 bricks with Centos 6.3 with the following structure:
> Type: Striped-Replicate
> Volume ID: 23dbb8dd-5cb3-4c71-9702-7c16ee9a3b3b
> Status: Started
> Number of Bricks: 1 x 2 x 2 = 4
> Transport-type: tcp
> Bricks:
> Brick1: 10.0.51.31:/gfs
> Brick2: 10.0.51.32:/gfs
> Brick3: 10.0.51.33:/gfs
> Brick4: 10.0.51.34:/gfs
> Options Reconfigured:
> performance.quick-read: on
> performance.io-thread-count: 32
> performance.cache-max-file-size: 128MB
> performance.cache-size: 256MB
> performance.io-cache: on
> cluster.stripe-block-size: 2MB
> nfs.disable: on
>
> I started profiling and found out one node with absurd latency figures. I
> stopped the node and the problem moved to another brick:
>  %-latency   Avg-latency   Min-Latency   Max-Latency   No. of
> calls         Fop
>  ---------   -----------   -----------   -----------   ------------
> ----
> 99.94  551292.41 us      10.00 us 1996709.00 us            361    FINODELK
>
> Could anyone provide some information how to debug this problem? Currently
> the volume is not usable due to the horrible delay.
>
> Thank you very much in advance,
> Samuel.
>
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>
>
>
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