Hallo Rahul,
the problem is that the 40/80GB label on the tape package is purely marketing based on the DLT8000 drive. What counts is the type of drive and the compressability of the data. In your case the DLT IV tape is marketed as 35/70GB. Without compression 35 and with 2:1 compression 70 GB. But the compression depends on the data, which means you can have more or less. My experience with the data I back up is about 55 GB compressed, but I have already written 120 GB to one tape.
For more information you should read (or download) the DLT Hanbook from www.dlttape.com, this book explains almost everything you would like to know about the current DLT tape drives and cartridges.
Bye Ernie
-----Original Message----- From: Rahul Kumar [mailto:Rahul.Kumar@sdrc.com] Sent: Samstag, 20. Oktober 2001 05:49 Cc: toasters@mathworks. com Subject: DLT 7000 question
Hi All, Can anyone tell me how to enable the compression on DLT7000 tapedrive attached to F740. I use a 40/80GB tape on the filer tape drive. The drive make is tandenberg . I usually see the drive compression led on. Is there any special option in dump command to reflect the compression.... right now i back up around 45 gb data.. but the dlt is asking to insert the second tape.
the command which i issue to backup entire volume is (45gb---vol0)
dump 0ufb rst0a 63 /vol/vol0
Rahul
-----Original Message----- From: Manny Kaiser [mailto:mkaiser@mmcnet.com] Sent: Saturday, October 20, 2001 1:37 AM To: ilya.birman@abnamro.com Cc: toasters@mathworks. com Subject: RE: Veritas Netbackup Database
Hi,
did you test the ability to recover this database? Just to make sure I understand - /usr/openv/netbackup/db is an NFS mounted file system? Did you do a disaster recovery test to see that you can recover the database and then restore files from the database? What is the size of your database? Does the database reside on a Netapp - if so did you attempt to also backup the database using NDMP? I would assume that this won't work well since on the one hand the database changes as the backup progresses, on the other hand, NDMP is backing up a snapshot which will not contain the information of this backup.
Manny
-----Original Message----- From: ilya.birman@abnamro.com [mailto:ilya.birman@abnamro.com] Sent: Friday, October 19, 2001 7:25 PM To: Manny Kaiser Cc: toasters@mathworks. com Subject: Re: Veritas Netbackup Database
We did that. Veritas did not tell us not to do it. We have a enormous amount of data do backup so we had to migrate the NteBackup DB of local disk. So for no problem. The concern we had is that on normal backup you can direct Veritas to "Follow NFS". There is no such option on NetBackup Catalog backups. We were concern if the catalog will be backed up properly. As far as NFS not being reliable, I think that battle had been fought many years ago. Ilya
"Manny Kaiser" <mkaiser@mmcnet.co To: "toasters@mathworks. com" toasters@mathworks.com m> cc: Sent by: Subject: Veritas Netbackup Database owner-toasters@mat hworks.com
10/19/2001 10:03 AM
Has anyone placed the Veritas Netbackup database on an NFS mounted file system? More specifically on a netapp? I was just told by Veritas that they do not recommend doing this because NFS is unreliable. Any feedback would be helpful.