z10's are reliable, but not perfect - they go down (well, z9's do :). RAID disks fail too. SW fails. Nothing's perfect. You have to figure out the cost of providing redundancy in all layers vs. what an outage costs you. It's different for every app usually. Have you seen this? (watch for line wrap)
http://www-03.ibm.com/servers/eserver/zseries/library/whitepapers/pdf/HA _Architectures_for_Linux_on_System_z.pdf Marcy "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Alan Altmark Sent: Wednesday, August 13, 2008 4:14 PM To: [email protected] Subject: Re: [LINUX-390] z/VM, Linux, MQ, "HA"? On Wednesday, 08/13/2008 at 05:12 EDT, Tom Burkholder <[EMAIL PROTECTED]> wrote: > So I contend that the z/10 h/w is reliable, the DASD is raid, the > vswitch can have failover OSA's, so as long as we alert and don't > fill up filesystems, we have a decent chance to keep the QMGR > available on the > z/Linux server. Because of HACMP for AIX and Windows clustering, everybody > wants to know about z/Linux "HA" at the O/S level. You need it. It's not about the hardware, it's about people and software. Your applications need protection from an *unplanned* outage, for a variety of reasons: - loss of power - z/VM abend - "I *meant* to shutdown my 2nd level system" And, of course, there are other reasons you may PLAN to turn off the machine, the LPAR, or VM (service). Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
