Looks like 512 is OK in the 7.1 docs:
*IBM Tivoli Storage Manager, Version 7.1* ------------------------------ Tcpbuffsize The tcpbuffsize option specifies the size of the internal TCP/IP communication buffer used to transfer data between the client node and server. Although it uses more memory, a larger buffer can improve communication performance. [image: AIX operating systems] [image: HP-UX operating systems] [image: Linux operating systems] [image: Oracle Solaris operating systems] [image: Mac OS X operating systems] [image: Windows operating systems] Supported Clients This option is valid for all clients. Options File [image: AIX operating systems] [image: HP-UX operating systems] [image: Linux operating systems] [image: Oracle Solaris operating systems] [image: Mac OS X operating systems] Place this option in the dsm.sys file within a server stanza. You can set this option on the Communication tab, in the Buffer Size field in the Preferences editor. [image: Windows operating systems] Place this option in the client options file (dsm.opt). You can set this option on the Communication tab, in the Buffer Size field in the Preferences editor. Syntax [image: Read syntax diagram][image: Skip visual syntax diagram] <http://www-01.ibm.com/support/knowledgecenter/SSGSG7_7.1.0/com.ibm.itsm.client.doc/r_opt_tcpbuffsize.html?lang=en-us#d287668e133> >>-TCPBuffsize-- --*size*---------------------------------------->< ParameterssizeSpecifies the size, in kilobytes, that you want to use for the internal TCP/IP communication buffer. The range of values is 1 through 512; the default is 32. Depending on the operating system communication settings, your system might not accept all values in the range of 1 through 512. On Thu, Feb 18, 2016 at 2:15 PM, Skylar Thompson <skyl...@u.washington.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 (skyl...@u.washington.edu) > -- Genome Sciences Department, System Administrator > -- Foege Building S046, (206)-685-7354 > -- University of Washington School of Medicine >
