Firstly, thanks for the response! 1. You have 50 gig under backup/amanda control, but how much data are you currently backing up per week ?
Currently not doing any backups through Amanda. I am trying to understand this whole theory of numbers involved in configuration. I want to start backing up a 50G partition with a Full backup on Monday and incrementals on each day till next week's Monday. So I think for 7 days I will have to backup 50G + 200M x 6 days = 50.6G . Let's say 55G a week. My original configuration is with little idea. dumpcycle 7 runspercycle 7 tapecycle 20 I though above would yield me 7 Days of backup including 1 Full and 6 incrementals in 1 dumpcycle and all 20 tapes will be used. I don't know if I am right. 2. With current settings, tapecycle and dumpcycle you will have between 2 and 3 full dumps per partition "on tape" at any one time, 2.x X 50 Gig >> 80 Gig so you are already short on (vtape) space. Correct I think I also think I am short of Vtapes. I wonder if I should add more 4.xx G size tapes or redo Vtapes of 40G size each to utilize whole 300GB of disk space. 3. I believe that vtape size is an upper bound, unused space on the vtape is actually free space on the disk, so you can actually oversubscribe the 300 gig pool by some percentage (depending on numerous factors that we currently do NOT have a handle on). I am not sure I understand what oversubscribe actually is but I wonder if I really need it. could you tell me what it will actually do in my case? 4. With 4 Gig tapes... how large are your DLEs ? 4 Gig is relatively small, are you using tape spanning or are all of the DLE's small ? I don't believe Tape spanning is configured. I just used Vtapes document from Amanda wiki and so used 4GB dvd size as it is mentioned there. that's why I am here now to tweak it. DLEs in my disklist are as below, amandaclient.domain.com /backup/location comp-tar 5. With 4-gig tapes and 50 gig under backup you must use 12 tapes for a complete dump of the system, with a pool of 20 tapes you can not have two complete dump cycles... Okay. that makes sense. 6. It seems that either I'm badly misunderstanding your config or you are badly underconfiguring your tape pool. Yes, I can provide you whatever is required. I know even 300G may not very large but then I'd like to have best possible that I can make use of it as of now. Thanks for helping me out! Thanks +---------------------------------------------------------------------- |This was sent by [email protected] via Backup Central. |Forward SPAM to [email protected]. +----------------------------------------------------------------------
