On 26 Sep 2002, Oleg Goldshmidt wrote:
Hi, I'll make it to the point. It seems that from the reactions (except Guy) I got on this list, no one really understands the nature of what a production server means in terms of performance, while you do understand what it means in terms of accountability and risk taking. The system I was talking about handles mail for 50,000 users, using postfix on one system (mail spool and mailqueue are on a netapp connected with GigE to that system), and another system (exactly the same) that does imap/imaps/pop/pops. Both are capable of doing everything, and a service monitor using a DNS sub domain is handling failures of each service, moving the service to the other host. The system moves about 100,000 emails per day, peaks at 120-130k. There are a few hundred PCs at TAU in offices (I am excluding classes and other stuff) that are defined to check mail every 5 minutes, so every 5 minutes there is a huge burst of connections. The importance of NFS performance and stability over the GigE to the Netapp is of course crucial, and so is the VM, for handling the load, the many processes running, and proper handling of high speed networking. I was thinking of posting the idea behind the system and approximate costs to this list long ago, as it saved us alot of money, and I believe the design we use is both robust and scalable (to a point of course). For this system, RedHat distro kernels just didn't do, while 2.4.18-pre3-ac2 that runs there for a year or close to it works great. There are also other problems with xinetd's robustness and other issues that required tuning, including tcp stack tuning for ADSL users and other issues. I send very few messages to this list. We experienced with this for over a year till I sent this mail. I generally do not tend to shoot up unsubstantiated claims in the air and waste everyone's time. best, --Ariel -- Ariel Biener e-mail: [EMAIL PROTECTED] PGP(6.5.8) public key http://www.tau.ac.il/~ariel/pgp.html ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
