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>From naomi Fri May 7 14:47:43 MST 1993 remote from qip From: naomi@qip (Naomi Walker) Message-Id: <9305072147.AA25062@qip> Received: from qip by misty.anasazi.com; Fri, 7 May 93 14:47:44 MST Received: by qip (5.61/1.2) (from naomi (Naomi Walker) to informix-list@rmy.emory.edu) id AA25062; Fri, 7 May 93 14:47:43 -0700 Subject: Re: Un-attended Large Archives (fwd) To: informix-list@rmy.emory.edu (Informix List) Date: Fri, 7 May 93 14:47:43 MST X-Mailer: ELM [version 2.3 PL11] Content-Type: text Content-Length: 1820 > You imply that, by design, the system is intentionally locked during > media changes and this is incorrect. In fact, this problem can > generally be avoided by choosing a checkpoint frequency longer than > the default 5 minutes (there is little reason to have such frequent > checkpoints, in my opinion), better yet, choosing a checkpoint > interval greater than the amount of time it would take to change the > tape. While a "freeze" is still possible (should your checkpoint > happen to fall while a tape is being changed anyway), it becomes less > likely than with frequent checkpoints. Ah yes, but this doesn't cover the situation we face daily, in which our operator is doing backups on five or more machines at the same time, (plus needing smoke and potty breaks) and doesn't get to a reel change for ten or twenty minutes. In the mean time customers are dialing our agents (24 hour a day reservations system). We =CAN'T= allow the system to stop responding. Call it locked, or "frozen"; doesn't matter. By design or side-effect; doesn't matter. This isn't intended to sound like a flame. It's just I'm not sure the developers at Informix have a deep, heart-felt understanding of what problems a 7x24 operation face and what "OnLine" =really= means. When we first raised this problem with Informix support (over a year ago), they told us "Just do your archives in the morning, before you let your users on the system." Anyway, I was just commenting on the work-around we developed to support our customers when Informix told us they had no solution to the problem. -crl -- Chad R. Larson "I read the news today, oh boy!" -- John Lennon (602) 870-3330 ...!attmail!anasaz!chad chad@anasazi.com chad@anasaz.UUCP Anasazi, Inc. - 7500 North Dreamy Draw Drive, Suite 120, Phoenix, Az 85020