I have four WD2000JB drives connected to a Promise FastTrak TX4000 controller in a RAID 0+1 array.
I suspect that one or more of the drives is having an intermittent problem, but Promise doesn’t provide any diagnostics that can test for (or even report!) intermittent drive problems while the disks are connected to their controller. Their only recommendation is to disconnect each drive from their controller and attach it directly to an IDE port and then run “the drive manufacturers diagnostics”.
OK, I can do that. But how comprehensive are the Data Lifeguard (for DOS) diagnostics if I only run the “read-only” (non-destructive) tests?
And if I need to run “destructive” (ie, writing to the disk) diagnostics, how do I do a COMPLETE BIT-for-BIT backup of the disk… including all the array config info that the Promise controller writes (somewhere) on the disks? And of course, how would I restore it after the destructive tests?
(BTW, I’ve already contacted Promise, and they are not much help).