[Info-vax] DR's fate

[JF Mezei]

Stephen Hoffman wrote:

> Technically, you can use OpenVMS host-based volume shadowing (HBVS) 
> with IDE/ATA disks.  But the support is arguably barely useful.  
> IDE/ATA disks are ejected from the shadowset on any read or write 
> errors. 


I was told a number of times that IDE disk driver does not support the
logging of errors. Does it still report read errors to applications ?

For instance, when I had a failing IDE drive, it reported nothing in the
errorlog, and BACKUP ran without any disk read errors (but some files
were detected as corrupted).

Was this Backup internally and silently retrying reads whenever it got a
read error ? Or the disk driver doing that transparently and Backup not
haveing a clue of the read errors ?

When one layers another disk river such as the DS driver for shadow sets
above the IDE driver, does that DS driver get any more imformation about
disk read/write errors than would Backup reading the DIE disk without
shadow set involved ?