1023 should be fine. I may have fiddled with the parameter at a time when
512 was the max. I remember that DISKBUFFSIZE had vast impact on the
performance when backing up a NAS from CIFS share and via a high speed,
high latency link to the TSM server.
Hans Chr.
On Thu, Feb 18, 2016 at 10:50 PM, Tom Alverson <tom.alverson AT gmail DOT com>
wrote:
> Thanks for that info. I tried both of those settings at the same time and
> it seems to have helped. I will do some more testing but will probably
> keep both settings even if only one is helping the WAN speed. The
> DISKBUFFSIZE can be set as high as 1023. (those are only kbytes). Is
> there any reason to avoid the max?
>
> Tom
>
>
> >>-DISKBuffsize-- --*size*---------------------------------------><
> Parameters[image: Windows operating systems] WINDOWS sizeSpecifies the
> maximum disk I/O buffer size (in kilobytes) that the client uses when
> reading files. The range of values is 16 through 1023; the default is 32.
>
> On Thu, Feb 18, 2016 at 2:30 PM, Hans Christian Riksheim <
> bullhcr AT gmail DOT com>
> wrote:
>
> > I have had luck with setting tcpwindowsize 0 on server and client and
> > letting the OS handle it.
> > Also diskbuffsize 512.
> >
> > Hans Chr.
> >
> > On Thu, Feb 18, 2016 at 8:15 PM, Skylar Thompson <
> skylar2 AT u.washington DOT edu
> > >
> > wrote:
> >
> > > I thought TCPBUFFSIZE could only go up to 64? It could be that setting
> it
> > > to 512 actually sets it to the default of 16.
> > >
> > > On Thu, Feb 18, 2016 at 02:03:26PM -0500, Tom Alverson wrote:
> > > > I am seeing very poor WAN performance on all of my (wan based) TSM
> > > > backups. Due to the latency (40 msec typical) I normally only get
> > about
> > > > 20% of the available bandwidth used by a TSM backup. With EMC
> > Networker
> > > I
> > > > get over 90% utilization. I have already set all of these
> recommended
> > > > options:
> > > >
> > > > RESOURCEUTILIZATION 2
> > > >
> > > > TXNBYTELIMIT 2097152
> > > >
> > > > TCPNODELAY YES
> > > >
> > > > TCPBUFFSIZE 512
> > > >
> > > > TCPWINDOWSIZE 2048
> > > >
> > > > LARGECOMMBUFFERS YES
> > > >
> > > >
> > > > Does anyone know of anything else that could help performance? Has
> > > anyone
> > > > used a Riverbed accelerator for TSM backups?
> > > >
> > > >
> > > > Tom
> > >
> > > --
> > > -- Skylar Thompson (skylar2 AT u.washington DOT edu)
> > > -- Genome Sciences Department, System Administrator
> > > -- Foege Building S046, (206)-685-7354
> > > -- University of Washington School of Medicine
> > >
> >
>
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