> But for HA applications, we still need some additional redundancy > or at least some error diagnostics at application level. Well, > we'll most likely needs this anyways, eg. to detect human fault > or code bugs.
i hadn't realised the code i'd quoted only dealt with blocks in memory (i didn't look hard enough once i'd found it), but russ then pointed out that another option will do something like the check i'd intended. given that, you have at least a check and a diagnostic that the unlikely event ocurred. it isn't the case i'd worry about first. after all, the applications pull the stuff into memory across interfaces that might have at most a parity check, after transmission using protocols that use a fairly simple 16-bit check sum, a compromise between speed of calculation and effectiveness. one might sometimes add an end-to-end check, or digesting ... perhaps using SHA1!
