Re: Legato vs TSM for VMS backup pros and cons
From: Shaun Ellis (sellis@legato.com)
Date: 04/21/03
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From: sellis@legato.com (Shaun Ellis) Date: 21 Apr 2003 12:36:34 -0700
We do not claim to be better than VMS Backup/image for restoring an
OpenVMS system disk. As you say, that would be ludicrious. However,
there are many ways around this issue.
What we are better at is multistreaming to tape devices, something VMS
users have asked for for a long time.
Tracking the media, and what is on it.
Restoring a disk to an exact point in time.
Scheduling the backups.
basically, if you look at all the advantages that NetWorker on OpenVMS
gives you, then the issue around the system disk is quite small. There
are, also, so many ways to crack that nut.
e.g.
Have a spare disk with NetWorker on it (How much does a disk cost
these days?)
Boot into a cluster as a remote cluster client
Build a bootable CD with NetWorker on it.
Even if it was using a spare disk, the money/time you save using an
automatic backup method more than outweighs the cost of a few hundred
$'s for a disk.
BTW, just for the record, I used to be the Senior System Manager for
Digital IS in the North UK, and used to deliver consulting on the
automation of datacentres. I even worked for the SLS and ABS
engineering teams for a while. I left Digital/Compaq to join Legato in
1999 after 14 1/2 years.
regards
Shaun
prosullivan@aol.com (prosullivan@aol.com) wrote in message news:<a14b767a.0304050327.4c4cb979@posting.google.com>...
> > >
> > > o This release will backup and restore a bootable OpenVMS
> > > system disk. All alias directories, including the
> > > SYSCOMMON.DIR directory which points to the VMS$COMMON.DIR
> > > directory, are now backed up and restored correctly.
> > > System disk files that are required to be restored
> > > contiguously are now restored as contiguous files.
> > > See Section 12 System Disk Backups.
> >
>
> Wow, thanks for the can of worms that this topic as opened.
>
> We did look at the Legato solution for OpenVMS Alpha and restored a
> system disk backup onto a system, but still had to make the system
> disk bootable by issuing a "writeboot.exe" as the Legato documentation
> instructs. And there is the risk. You have to run this command every
> time. In a DR situation, when the writeboot.exe doesn't work, Legato
> or TSM can say 'look our product did what it said on the box', and the
> IT department are left holding the baby.
>
> I don't fancy having to explain to my management why my backup system
> doesn't work: their answer would be: it appears you spend lots of
> [our] money on licenses, which restores a file-based backup only. TSM
> and Legato cannot therefore claim that their product offers better
> functionality than VMS BACKUP/IMAGE for botable image restores.
>
> Back to the drawing board.
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