[Gluster-users] [EXT] RDMA support in gluster 9

Mon Mar 1 06:31:34 UTC 2021

@Stefan: Thank you. I‘ll stick to IPoIB for now, trusting that real bottlenecks will probably be elsewhere. At the moment on an almost empty node, gluster uses 0.5-1 cores of 102.
I still hope that RDMA will be back sometime.

@Saju: Thanks for the clarifications. The main reason I “complained” publicly is that RDMA support (https://docs.gluster.org/en/latest/Administrator-Guide/RDMA-Transport/) in the official and current documentation has no indication in which versions it works or not. At least tiering is only mentioned as experimental in 3.7 and discontinued in release 6.

Rupert

Von: Stefan Solbrig <stefan.solbrig at ur.de>
Gesendet: Donnerstag, 25. Februar 2021 16:37
An: gluster-users at gluster.org
Cc: Schlick Rupert <Rupert.Schlick at ait.ac.at>
Betreff: Re: [EXT] [Gluster-users] RDMA support in gluster 9

Hi Rupert,

If you try RMDA (or work on the older, now removed RMDA code in glusterfs that use(d) ibverbs, be aware that there was a glitch, at least as of glusterfs v3.12.7:  https://lists.gluster.org/pipermail/gluster-users/2018-May/034135.html   A directory with tens of thousands of files did not show all directory entries.)  I couldn't fix this back then and instead switched to ipoib.  Although the measured per-file bandwith back then was better with RDMA than with ipoib by about 50%, I stayed with ipoib because in the aggreate bandwith (many clients reading many files simultaneously) it didn't make a difference.  (Our bottlenecks are elsewhere, not in the network bandwidth between server and client.) I've used ipoib since then to run a glusterfs with more than 2 PB and haven't had serious problems so far.

best wishes,
Stefan

Am 24.02.2021 um 10:59 schrieb Saju Mohammed Noohu <sajmoham at redhat.com<mailto:sajmoham at redhat.com>>:

Hi Rupert,

Apologies for the inconvenience, even though this was discussed, somehow it got missed in official release notes or documentation.

Few old discussions are below:
https://github.com/gluster/glusterfs/issues/692
https://lists.gluster.org/pipermail/gluster-users/2018-July/034400.html

Will surely document this as part of Gluster docs on an appropriate heading.

As evident from the above discussions, we deprecated it since we had no means to support it. If that changes, we'll be happy to work on re-enabling it, maybe as a compile-time option.

Thanks
Saju

On Wed, Feb 24, 2021 at 1:23 PM Schlick Rupert <Rupert.Schlick at ait.ac.at<mailto:Rupert.Schlick at ait.ac.at>> wrote:
What surprised me is more that, if not looking into the developer channels, there is no indication that the feature is gone till it crashes when you try to use it. I did not think of Gluster as a developer-only tool, even in the “community version”.

Native RDMA support was the main reason for me to choose GlusterFS over MooseFS – although it’s just a feature on “paper” and I do not really know yet the real needs and bottlenecks of our new cluster. With both RDMA and tiering gone, I based my decision on completely outdated information about gluster features.

@strahil: I hope to find some time to try your suggestion next week, thanks. But even if it works, I will most probably not risk using something the developers consider not fit for use anymore. There seem also to be issues with mixed mode and multiple IP addresses anyway – our computation and storage nodes are on a infiniband (RDMA and IP over Infiniband) island network, but all are also connected to the outside via IP over Ethernet. The login nodes, which would also need access to the cluster file system are in a VM and only accessible via IP over Ethernet

Rupert

Von: Strahil Nikolov <hunter86_bg at yahoo.com<mailto:hunter86_bg at yahoo.com>>
Gesendet: Dienstag, 23. Februar 2021 11:20
An: Schlick Rupert <Rupert.Schlick at ait.ac.at<mailto:Rupert.Schlick at ait.ac.at>>; Saju Mohammed Noohu <sajmoham at redhat.com<mailto:sajmoham at redhat.com>>
Cc: gluster-users at gluster.org<mailto:gluster-users at gluster.org>
Betreff: Re: [Gluster-users] RDMA support in gluster 9

As everything deprecated, it never get's completely removed from source.

Can you try to 'make' from source and check if v9 by default has 'Infiniband verbs'  disabled ?
If yes, then you can compile with enabled supportand try that.

Best Regards,
Strahil Nikolov
On Tue, Feb 23, 2021 at 10:40, Schlick Rupert
<Rupert.Schlick at ait.ac.at<mailto:Rupert.Schlick at ait.ac.at>> wrote:
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