Re: Help, tbtape is trashing my rootdbs!

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