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.alver...@gmail.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 < > bull...@gmail.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 < > 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 > > > > > >
