In my experience the defaults give far from the best performance. Ofcourse, this always depends on the actual configuration, and the only way to get the best performance is to test your environment.
Setting hi receive and transmit windows in Linux usually gives some speed, and uselargebuffers/largecommbuffers/tcpnodelay in dsm.sys often gives speed improvements. As I recall tcpwindowsize is maxed at 128 in Linux and tcpbuffsize 512. txngroupmax gives speed improvement and should be changed depending on if your'e sending directly to tape or disk. The most important thing is ofcourse trying to use as many sessions as possible (resourceutilization). Try breaking up large filesystems with virtualmountpoints. For more tips, check out IBM's performance tuning guide at http://publib.boulder.ibm.com/tividd/td/TSMM/SC32-9101-01/en_US/HTML/SC32-9101-01.htm Theres also alot of guides for tuning Linux sysctls out there. -David -- David Hendén Exist AB, Sweden "Hougaard.Flemming FHG" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[email protected]> 2006-02-10 00:44 Please respond to "ADSM: Dist Stor Manager" <[email protected]> To [email protected] cc Subject Best practice for linux backup Hi all Anyone got any ideas for a "best practice" for backup of linux servers to increase performance?? Typically the backup will be done over WAN links of 2-100 Mbit. I'm thinking TCPWINDOWSIZE, TCPBUFFSIZE etc... is the default values good enough? Or do I have to fine tune here? Regards Flemming _______________________________________________________________________________________ www.kmd.dk www.kundenet.kmd.dk www.eboks.dk www.civitas.dk www.netborger.dk www.organisator.dk Hvis du har modtaget denne mail ved en fejl vil jeg gerne, at du informerer mig og sletter den. KMD skaber it-services, der fremmer effektivitet hos det offentlige, erhvervslivet og borgerne. If you received this e-mail by mistake, please notify me and delete it. Thank you. Our mission is to enhance the efficiency of the public sector and improve its service of the general public.
