Boris, we have the same thing here but with LTO1 and 2. We have a L80 that has
4 drives one LTO 1 and two LTO 2. We use all lto1 tapes in the robot. LTO 2
will read and write LTO 1 tapes. So I would imagine that LTO 3 can read and
write LTO 2 tapes. Configure the drives as lto3 and just use LTO 2 media in the
robot.
Greg
________________________________
From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces
at mailman.eng.auburn.edu] On Behalf Of Boris Kraizman
Sent: Tuesday, December 19, 2006 9:41 PM
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] LTO3 Read/Write LTO2
Hi Folks,
Just got three new LTO3 tape drives in our STK L180 and had to configure them
as hcart2 for compatibility with the remote site with same library, but with
LTO2 tape drives. We tested all combinations, ran backups and restores on same
media with the new drives and on a small L20 liner with LTO2 drives, and worked
well. So, it seems no problem and we can wait until we get LTO3 at the second
site as well. Again, yes it was tricky to make NetBackup works with LTO2 tape
media, we followed a white paper, that says about how to configure a new
generation of tape drives and make it compatible with the older tapes. But,
still if I need to do restores and reads from old tapes, do I have to keep LTO3
tape drives as hcart2? or I can make tape media hcart3 with vmchange based on
the guildlines. I would like to hear, how I would use lto2 tapes with lto3
drives and keep running backups already on lto3 cartridges. It seems, maybe we
will have to keep one tape drive with older type of density (hcart2) for such
requests.
Regards,
Boris
On 12/19/06, Paul Keating <pkeating at bank-banque-canada.ca> wrote:
-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Weber, Philip
Sent: December 19, 2006 12:30 PM
To: Wessam Aly; Dave Brown
Cc: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] LTO3 Read/Write LTO2
I've also heard that once you've used LTO2 media in an LTO3
drive, you can't then read it in an LTO2 drive. Not sure where I got this from
though.
Absolutely 100% false.
I was worried of the same, so I test the hell out of my LTO3
drives before putting them into prod. I've got 4x LTO2 drives, and 5x LTO3
drives in each of my two libraries, and 100% LTO2 media.....been running like
that almost a year with no problems.
I've also got some new LTO3 drives having asked for LTO2...so
far they seem to be running slower than the LTO2s as I can't supply data to
them fast enough :-(... time to play with mpx and buffer sizes...
MPX and number of buffers, yeah, but buffer size should be the
same (256k) for both.
Get yourself some fast DSUs, VTLs, or use SAN media servers to
prestage your data......pushing it over 100Meg ethernet isn't going to do you
any favours.
Paul
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