09-04-2013 01:59 PM
I just installed a new master server that has 40TB of disk space. I noticed that after the fulls ran this past weekend the previous fulls performed were removed. What determines what is left on disk? I assumed that the high/low watermark did, but it seems that once a new full is performed it expires the previous full. Is that how it works, or is there something that can be changed to retain the backups to disk longer?
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09-06-2013 07:01 AM
So basic disk, if you use staging, is capacity managed and here your high / low watermarks come into play
However, if images expire they will be removed
So if the retention of your full backups is 1 week they will be removed after 1 week whether the disk is full or not
Hope this helps
09-04-2013 02:11 PM
There are a number of variables that need to be considered:
Is this Basic Disk, Advanced Disk, DSSU, MSDP?
The processes involved with disk utilization are the Image Cleanup, and with MSDP the queue processing and garbage collection...
09-04-2013 03:28 PM
09-04-2013 09:19 PM
You need to tell us how this 40TB of disk space was configured in NBU.
High/Low watermarks plays a role if DSSU is configured, else retention levels specified in SLP or schedule.
09-06-2013 06:26 AM
Sorry for the late response and thanks for the replies.
This Storage unit is setup as a Basic Disk
09-06-2013 07:01 AM
So basic disk, if you use staging, is capacity managed and here your high / low watermarks come into play
However, if images expire they will be removed
So if the retention of your full backups is 1 week they will be removed after 1 week whether the disk is full or not
Hope this helps
09-06-2013 07:37 AM
The retention of my full backups are for 1 month.
09-06-2013 07:41 AM
So how large is a full backup of everything?
I knwo you have 40TB of disk but not how large your full backup is - if it is more than 20TB then you could expect it to clear all of the old ones down
What version of NetBackup are you running? There was a bug that constantly cleared down the disk images as soon as they had been duplicated - it was fixed in the latest releases of each version or was temporarily cured by a media server reboot
09-06-2013 07:54 AM
09-06-2013 10:18 AM
Basic disk with staging to tape.
Also, Mark you ask how large my backups are. They are only about 8TB for a full weeks worth of backups including the weekend fulls and the incrementals through the week.
09-06-2013 12:43 PM
Disk staging expiration/cleanup is controlled by retention period and by H/W mark.
What is HWM set to on the Storage Unit?
Enable bpdm log on the media server to see when cleanup is taking place.
This TN explains how cleanup is done since NBU 6.5: http://www.symantec.com/docs/TECH66149
09-06-2013 01:15 PM
High is 98% and low is 80%
09-10-2013 03:01 AM
Have you had a look at the TN in my previous post?
Do you have bpdm log enabled on media server(s)?
09-10-2013 03:46 AM
As it stands with what you have said you would expect to have at least 2 or 3 Full backups retained on disk based on its size and retention period
If you do not have any retained then something is clearly wrong.
What version and patch level of NetBackup are you using? - As i said there were bugs that caused it to clear everything down - though if that were the case i would expect the disk to be totally empty once it had all been duplicated to tape.
So that we can get a better idea could you run the following commands and attach the outputs (feel free to change server names in the output) - all from \netbackup\bin\admincmd\:
bppllist -allpolicies -U>c:\policies.txt
bpstulist -g -U>c:\stus.txt
bpschedule -U>c:\stusched.txt
Thanks
09-10-2013 04:56 AM
I must apologize. I may have wasted everyone’s time. It looks a though it is retaining the backups as expected. I don't know if I was overlooking it when I was doing the search in the catalog or what, but I have the fulls for this past weekend and last weekend. Thanks for everyone’s insight though.
09-10-2013 05:07 AM
If you did experience the bug that I mentioned earlier then you may have been right!
Do make sure that you are patched right up to date just in case