[OpenAFS] AFS Performance / ZFS

[Jeffrey Altman]

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On 3/7/2019 9:43 AM, Andreas Ladanyi wrote:
> Hi,
>=20
> iam testing a box with FreeNAS=C2=A0 (BSD) and ZFS. On this box i use
> virtualized byhve guest as afs server.
> [...]
> Any ideas why afs speed is only about 25 MByte/s ? Maybe i have to
> adjust another afs server parameter ?

There are performance bottlenecks in the byhve network virtualization
that severely impact RX throughput.  The weaknesses in the OpenAFS RX
implementation related to flow control, congestion avoidance, and pacing
exacerbate the throughput limitations.

AuriStorFS customers use TrueNAS to back vice partitions but do so by
exporting the ZFS storage via iSCSI to RHEL7 systems connected to the
TrueNAS server with dedicated bonded 10-gbit NICs.  This combination is
reliable and is capable of filling the iSCSI path.

Jeffrey Altman
AuriStor, Inc.


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