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- Path: sparky!uunet!gatech!darwin.sura.net!spool.mu.edu!olivea!gossip.pyramid.com!pyramid!infmx!davek
- From: davek@informix.com (David Kosenko)
- Newsgroups: comp.databases.informix
- Subject: Re: Help, tbtape is trashing my rootdbs!
- Keywords: Online, IBM RT
- Message-ID: <1992Dec21.165941.6414@informix.com>
- Date: 21 Dec 92 16:59:41 GMT
- References: <1992Dec7.223649.18907@bogart.uucp> <1992Dec14.171459.21988@informix <jgabriel.724605386@academ01>
- Sender: news@informix.com (Usenet News)
- Organization: Informix Software, Inc.
- Lines: 34
-
- Ing. Juan Gabriel Ruiz writes:
- >davek@informix.com (David Kosenko) writes:
- >>What you should do is run a low-level disk surface check on the devices you
- >>are using for your chunks. Typically, this problem is caused by bad blocks
- >>present on the device.
- >
- >>As per bringing your system back up after a "bad block experience": if you
- >>edit your tbconfig file and set MIRROR to 1, you will be able to restart
- >>your system even though the chunk is marked as down.
- >
- >I don't understand your information, you're saying that we need a very
- >clean hard disk to make Informix work, and I understand with this that
- >Informix doesn't have a bad block rellocation schema and I think this
- >is elemental.
-
- I am simply telling you what you have to do to fix your
- problem. The way OnLine currently works does not remap bad blocks.
- Consider that most versions of Unix have the same limitation.
-
- >In other way, you said that if we set MIRROR=1 we'll be able to restart
- >the system, but at what cost, doble disk space needed??
-
- No. The only overhead in turning the MIRROR flag on is that a mirror chunks
- structure will be allocated in shared memory, which is of nominal size
- (152 * CHUNKS bytes). Note that this does not turn mirroring on for any
- dbspaces - that must be done as a separate step. It simply enables the system
- to support mirroring.
-
- Dave
- --
- Disclaimer: These opinions are not those of Informix Software, Inc.
- **************************************************************************
- "I look back with some satisfaction on what an idiot I was when I was 25,
- but when I do that, I'm assuming I'm no longer an idiot." - Andy Rooney
-