Moloko, Your other mail to the list show in the output of top a system cpu usage of only approx. 3% so I don't think the disks are the bottleneck. Our machine had a system load of nearly 85%.
----- Original Message ----- From: "Moloko Monyepao" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, April 24, 2002 7:55 AM Subject: Re: Sendmail Perfomance Robert! According to our monitoring we did not notice any perfomance problems on the disks or the network. The disk is using Raid0 on about 4 disk which can be reached by about (4 ficon channels and 4 escon channels shared between 5 Lpars). Thanx Moloko > -----Original Message----- > From: Robert Werner [SMTP:[EMAIL PROTECTED]] > Sent: 23 April 2002 16:41 > To: [EMAIL PROTECTED] > Subject: Re: Sendmail Perfomance > > Hi Moloko, > > We made the experience that you cannot compare the load averages directly > between Intel an Linux/390. Also the shown load average on our linuxes is > higher using a 2.4 kernel as with kernel 2.2.x (why?) > > But if there's really a problem with the performance on the S390 you have to > find out where your bottleneck is. On our smtp-relay on the z900 (under VM, > SuSE7.0 with kernel 2.4.7, sendmail 8.11) the disk performance slowed down > the system and pushed up the load average. A solution is to attach the disks > using more channels and to stripe the spool-area over several disks and > channels with LVM or software Raid0. > > Sendmail also slows down if the number of mails in your spooldir gets to > high. So if you have a huge amount of spooled mails it is better to split > the spool area in several subdirs with dedicated sendmail instances > processing the queues. > > We also had bad performance with kernel 2.2.x. > > Robert. > > > > ----- Original Message ----- > From: "Moloko Monyepao" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Tuesday, April 23, 2002 3:35 PM > Subject: Sendmail Perfomance > > > I have sendmail 8.11.6-3 installed on Redhat 7.2 (server installation) on > S390(Lpar) with an IFL dedicated to this Lpar. We made the O QueueLA=10 and > the O RefuseLA=12 which is the same setup as on my Intel machine. When using > top to check the load the following is what I get. The O > MaxDaemonChildren=100 on S390 and 300 on Intel. > > Intel Machine = The Load average does not go over 10% when setup for both > incoming and outgoing mail. > > S390 Machine = The Load average goes to more than 10% and it start rejecting > connections if we set it up for both incoming and outgoing mail and it gets > up to about 6 to 8% if we only set it up for outgoing mail which is not a > lot. > > Please assist > Moloko
