We have been live since October. Everything is fine at the Universe level. We havent had any major issues at all. One thing we used to do to get users off at the end of the night or when needed is to do a 'MASTER OFF ALL'. It doesn't work on the Linux version. Other than that, Universe is peachy.
I find that support for Linux is generally lacking. Red Hat support is 'alright'. We have RedHat support thru IBM, which is much better than the RedHat support (IBM is usually a knowledgeable person that speaks English very well vs the RedHat guy who is not always very knowledgeable and has an accent that requires a special hearing device to interpret). IBM support is cheaper too. We keep RedHat for the up2date functionality and the resources they have. It really is a nice way to keep things current. Are you using all Dell Hardware ? We are running an IBM xSeries Server and an EMC Clariion. We are having performance issues with intensive writes to the disk array. There is a minor issue with this when doing the same kind of operation on the internal disks. Intensive disk writes could be an batch application that reads records from one file, deletes and writes to another (say 100,000 records type 30 files with indexes). We do this for archiving data. It could be a linux 'cp' command copying a large file (100meg) to the disk array. What happens is that the system goes into an iowait state and user response is non-existent. Sometimes, the system will hang for close to a minute until the i/o completes. We are also using Qlogic 2340 HBA's to connect the IBM to the Clariion. If you look thru the RedHat Bugzilla, there have been issues with the driver for this hardware. We will be testing out some Emulex cards next week to see if that improves things. If you have the luxury to evaluate your system, definitely try copying some large files or 'archiving' type processes while users are on. Monitor performance with the 'top' command. Then determine if things are acceptable. We converted from a DG/UX box with a Clariion. Performance was never really an issue on that platform and these types of operations would absolutely go unnoticed. EMC has been trying to help with the issue since February. I have to say that their support SUCKS !!! It seems that there is no one there that knows anything about Linux. I am finding this in general. When you mention that you are running Linux, a dark cloud appears. So, you probably will not get the excellent type of support that you might be accustomed to with Solaris. I would assume that you like Dell support ? My experience with them is that they went from once upon a time very good (8 years ago or so) to the pits. Every time I call, I get transferred overseas to India and the conversation is almost unbearable. Recently, I ordered an extra cpu for our testmachine, which is a Dell. They cancelled it with out any notice ! When I called to reorder, they said I couldn't, because it wasn't in stock. So, I have to keep calling until I get a 'hit'. This is really a joke. Luckily, our var deals with Dell and was able to get parts. If you would like to know more about the performance issue, email me directly and I will share whatever information I have. Anthony Dzikiewicz IT Manager Alperts Furniture ---Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jerry Banker Sent: Friday, April 29, 2005 2:49 PM To: u2-users@listserver.u2ug.org Subject: [U2] UV on Linux We are finally moving our UV off our Sun Solaris 8 System and moving to Redhat on a Dell system. Many of you have been on Linux for awhile so tell me, how was your conversion? Did you have to tweak any configuration parameters? Any pitfalls we should know about? We usually run around 100 user sessions. Jerry Banker ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
