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SubjectRe: [0/3] POHMELFS high performance network filesystem. First steps in parallel processing.
Evgeniy Polyakov wrote:
> Hi.
>
> I'm pleased to announce POHMEL high performance network parallel
> distributed filesystem.
> POHMELFS stands for Parallel Optimized Host Message Exchange Layered File System.
>
> Development status can be tracked in filesystem section [1].
>
> This is a high performance network filesystem with local coherent cache of data
> and metadata. Its main goal is distributed parallel processing of data.
>
> This release brings following features:
> * Read requests (data read, directory listing, lookup requests) balancing
> between multiple servers.
> * Write requests are sent to multiple servers and completed only
> when all of them sent an ack.
> * Ability to add and/or remove servers from working set at run-time from
> userspace (via netlink, so the same command can be processed from
> real network though, but since server does not support it yet,
> I dropped network part).
> * Documentation (overall view and protocol commands)!
> * Rename command (oops, forgot it in previous releases :)
> * Several new mount options to control client behaviour instead of
> hardcoded numbers.
> * Bug fixes.

Neat :) Thanks for protocol documentation, too. Do you plan to add
write-pages in addition to write-page? Also, write-page does not appear
to be documented.

Is race-across-directories race-free? That is a sticky area, see
Documentation/filesystems/directory-locking in particular.

With the exception of encryption, do you think the POHMELFS client is
mostly complete, at this point?

Jeff




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