Networker

[Networker] Legato vs NFS3 or NFS4, any differences?

2012-06-29 08:01:13
Subject: [Networker] Legato vs NFS3 or NFS4, any differences?
From: Manel Rodero Blanquez <manel AT FIB.UPC DOT EDU>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Fri, 29 Jun 2012 13:47:55 +0200
Hello,

We're trying to backup a NAS (EMC VNX 5300) through a Linux Client (OpenSuse 12.1 x64 with Networker client nsr-7.6.3.3-1) to a Windows Server 2008 x64 with the same Networker version.

This is partition mounted from the NAS:

# df | grep /data
nas_server:/data           206515200  90912384 115602816  45% /data

If we mount the partition from the NAS using NFS3 the backup finishes in 3 hours more or less writing 42GB in the tape:

NAS_SERVER:/data/ on /data type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,
namlen=255,hard,proto=tcp,timeo=600,
retrans=2,sec=sys,mountaddr=N.N.N.N,
mountvers=3,mountport=1234,mountproto=udp,
local_lock=none,addr=N.N.N.N)

If we mount the partition from the NAS using NFS4 the backup we need to stop the backup because is slooow (for example, an 8 hours backup aborted with only 20GB writed to the tape).

nasa:/data/ on /data type nfs4 (rw,relatime,vers=4,rsize=32768,wsize=32768,
namlen=255,hard,proto=tcp,port=0,timeo=600,
retrans=2,sec=sys,clientaddr=N.N.N.N,minorversion=0,
local_lock=none,addr=N.N.N.N)

Do you know if this is right behaviour of NFS4 or can we tune it (in the client or in the NAS) so Legato can read faster. In all 2 tests we're performing a full backup.

Any idea would be very appreciated.

Thanks.

--

       Manel Rodero Blánquez
o o o  IT Systems Manager
o o o  inLab FIB
o o o  Barcelona School of Informatics
U P C  Universitat Politècnica de Catalunya - Barcelona Tech

       E-mail : manel AT fib.upc DOT edu
       Tel.   : +34 93 401 0847
       Web    : http://inlab.fib.upc.edu/

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