[mod.computers.vax] Volume Shadowing and Standalone backups

WARNOCK@clemson.CSNET (Todd Warnock) (12/31/86)

Is anyone using volume shadowing ?  What good is it ?  It appears, from the
documentation, that it's useless for a system disk.  (A volume cannot be
backed-up when it is an active shadow member, and to make it one (or to take it
out of a shadow set), both the shadowED and shadow disk must be dismounted.) 
In any case, I've yet to get it to work at all.  (I keep getting a message 
telling me that the device I want to shadow is not a valid shadow device.
(the manual mentions, in regards to the error message) that you cannot
shadow tape drives - This is an RA81 !!! (both shadowED and shadow !)
On another note... (posted before but never seen)...
What causes an active system disk to NOT boot from an online image backup ?
(ie: certain files open ?  If so, which ones ?)  Is there a way to get around
this ?

Thanks !

Todd Warnock
Clemson University
Warnock@Clemson.CSnet