INFO-VAX Mon, 17 Dec 2007 Volume 2007 : Issue 689 Contents: Re: "snapshot" backup and HBVS ---------------------------------------------------------------------- Date: Sun, 16 Dec 2007 20:13:19 +0000 (UTC) From: helbig@astro.multiCLOTHESvax.de (Phillip Helbig---remove CLOTHES to reply) Subject: Re: "snapshot" backup and HBVS Message-ID: In article , moroney@world.std.spaamtrap.com (Michael Moroney) writes: > >> > However, even if the contents are > >> >the same, if I split a mirror set and then mount it as a shadow set, as > >> >far as VMS is concerned this is a new shadow set---VMS doesn't know that > >> >the contents are identical. > >> > >> Sure it does. When you issue a $ MOUNT, MOUNT looks at the SCB and sees > >> the disk is a shadowset and acts appropiately. > > >Of course. However, if the two disks had been part of a mirror set > >(i.e. controller-level shadowing), then, as far as VMS is concerned, > >they have nothing to do with a HBVS shadow set until they are mounted. > > Why do you say that? If the mirror set was part of a shadowset, the SCBs > of the members will be that of a shadowset member. If the mirror FW does > what it is supposed to, the entire drives (specifically the SCBs) will > be identical. Disks with identical SCBs will be considered valid shadowset > members. OK, worth a try. > The RAID metadata is not relevant. If it's on disk blocks, it'll be on > blocks not even visible to VMS. OK. ------------------------------ End of INFO-VAX 2007.689 ************************