msteele Posted July 2, 2002 Report Share Posted July 2, 2002 Retrospect 5.0.x running on a PowerMac 7600 connected to SCSI VXA-1 drive (several other OS X clients connected but this question doesn't apply to them). PowerMac 7600 running OS 9. PM 7600 has 1 18 gig drive and 2 9 gig drives, one is a hand me down with nothing on it. Total capacity to backup this single machine is < 30 gigs. It should fit on one of the VXA-1 33 gig tapes, with compression it should hold it twice. In reality I get what appears to be reverse compression - that is about 15 gigs per tape. The backup completes one of the 9 gig drives (that isn't full) and about one quarter of the 18 gig when it runs out of tape and needs a new one. I'm pretty sure that when I was running 4.3 I could backup this machine and several of the clients before I needed to swap tapes. I could get an entire backup on two tapes, now with 5 I need at least 4 but I have not doubled the total byte count. I can I determine how much data is being put on one tape? How can I be assured that hardware compression is working? Thanks, -Mark Link to comment Share on other sites More sharing options...
AmyJ Posted July 3, 2002 Report Share Posted July 3, 2002 Check out these great Knowledgebase entries on Tape Capacity: www.dantz.com/index.php3?SCREEN=knowledgebase_article&id=914 www.dantz.com/index.php3?SCREEN=knowledgebase_article&id=530 In reply to: I can I determine how much data is being put on one tape? How can I be assured that hardware compression is working? Go to Configure > Backup Sets > Properties > Members Tab. You will see how much data is on each tape. To check hardware compression, make a new backup set _without_ hardware compression . This option can only be set during the backup set creation. Do a new backup of your source with software data compression enabled. This is set in the options for your backup. Make a second new backup set _with_ hardware compression enabled. Backup the same source. Compare the amount of data on the members. Link to comment Share on other sites More sharing options...
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