[Akonadi] [Bug 332624] New: NFS support

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=332624

            Bug ID: 332624
           Summary: NFS support
    Classification: Unclassified
           Product: Akonadi
           Version: 4.12
          Platform: Debian unstable
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: ms at teamix.de

Please support running Akonadi on NFS based home directories.

Using NFS and LDAP is IMHO quite common in organizations which use Linux on
desktops, be it companies, universities or schools.

As to my experience Icedove and Evolution work OK on NFS, but Akonadi / KDEPIM
work slowly, partly unusable slowly regarding large mail accounts. Daniel
hinted that storing paylouds into file_db_data may contribute to this issue[1].

As to my experience I do not thing the performance issues are not MySQL based.
MySQL seems to perform OK on NFS, possibly with raised innodb_buffer_pool_size.
MySQL database also seems to be consistent here after month of attempts to use
KMail on NFS :)

Also I didn't see issues with Korganizer journal entries. These general worked
nice.

I am reporting this as wishlist as suggest by Christian Mollekopf. Yet I think
errors of Akonadi on NFS based storage are bugs unless they are caused by
failures in the NFS infrastructure.

[1] https://bugs.kde.org/show_bug.cgi?id=332013#c11

Reproducible: Always

Steps to Reproduce:
Currently there are some bugs regarding that:


Bug 332013 - NFS: on moving a mail: ItemRetrieverException: Unable to retrieve
item from resource: NO PartHelperException, unable to open for writing, file
too big
=> Does not seem to happen mit Akonadi stored on local Ext4

Bug 331848 - displaying, moving, deleting mails takes 10-20 seconds when
Akonadi synchronizes in background
=> is party related, performance is much better with Akonadi based on local
Ext4.


Bug 275261 - Akonadi on NFS mounted home directories is very fragile 
=> This is a report with Akonadi on MariaDB on NFS.

 Bug 232086 - kmail unusable/broken in enterprise environment $HOME on NFS
during kmail was used same user on other client pc in the past hour 
=> Seem possibly may relate to some process not stopped correctly on logout. I
had this with MySQL database process once[2]

[2] https://bugs.kde.org/show_bug.cgi?id=332013#c9 – will report separately.
Actual Results:  
Slow performance upto Akonadi not doing appearing to do anything useful for
KMail anymore.

Expected Results:  
OK performance. There might be some tradeoffs, yet with low latency based NFS
storage I think technically it really can perform better.

My bug reports are with NetApp FAS based NFS exports. As to my knowledge and
what I hear from co-workers the NetApp FAS NFS server implementation provides
pretty good performance.

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