--- Rob van der Heij <[EMAIL PROTECTED]> wrote: > On Mon, 11 Oct 2004 15:34:36 -0700, Johnny Walton > <[EMAIL PROTECTED]> wrote: > > > I can't seem to remember what all these entries > mean. > > http://lxr.linux.no/source/Documentation/sysctl/vm.txt > > The 7th and 8th parameter seem to define the > percentage of dirty that > will kick in bdflush synchronously. The default for > these is 60% and > 20% so you want those to go down. > > We must not forget Marcy's warning about the 7700E. > You do want to > measure the I/O response of your DASD subsystem. The > pure device > response time may not be too helpful if you don't > know how big the I/O > is. Fortunately with ESCON this should be fairly > easy: the connect > time lets you compute the number of blocks per I/O. > From another issue I did learn that average I/O > response has its > limitations (e.g. when 1% of the I/O's takes 100 > times as long - does > not show in the average but is bad). > > > Thanks for sticking with me on this. > My pleasure. It's much better to work on someone > else's problem than > to work on your own problems... ;-) > > > Could you email me a signed version;) > Promised.. once we have sorted out this problem of > yours. > > -- > Rob van der Heij rvdheij @ > gmail.com > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access > instructions, > send email to [EMAIL PROTECTED] with the > message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 >
The only thing that is consistent is inconsistency. I moved the file with the standard settings and it took 5 minutes. Then I set the bdflush parameters to 30 and 5 in proc/sys/vm/bdflush and it went to 2min 30 secs. I then set the settings back to the original settings and got a 2 minute 30 sec move time as well. Would this be due to cache data? On a frsh reboot with 30M of cache data when I transfer the file with the new lower parameters it transfers in 4.5 minutes. A 200M file transfers in 30 secs = 6.6 MB/s. or it can take 1 min 45 secs. = 1.9 MB/s. We have 8 escon channels to the hitachi 7700e but i/o is definetly wierd. __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
