On Wed, 22 Jan 2003 at 3:05pm, hochenaw wrote > But the backup is to slow, we should have a backup rate of 10.8 GB > (native)/20.6 (comprimized), but we do not have :-(
GB is not a rate, it's a size. I assume you mean GB/hour? > In the file tapelist we have following entry (i dont know why): > ------------------------------------------------- > define tapetype HP-DLT { > comment "HP SureStore DLT" > length 80 gbytes # conservative estimate Err, no, actually that's a very optimistic estimate. Very rarely does hardware compression get you 2:1 as the manufacturers claim. And, if you're using software compression, you need to *not* use hardware compression and thus tell amanda the native capacity. > filemark 1 byte # should work given above > speed 30 mbytes # even more, but this isn't used in > amanda > } > ------------------------------------------------- > length in comprimized (80) or uncommprimized (40) modus? Again, it depends on whether you use software or hardware compression. > What does filemark mean? The amount of space the tape drive uses when it writes an EOF sequence. > speed in mbytes per minutes or ...? Does it have any consequence if i > insert to much/less speed? Nope. > How can i activate software or hardware compression (cant find an > entry in amanda.conf, just Client or Servers best in dumptypes-file)? Hardware compression is controlled either via dip switches on the drive itself or software (e.g., 'mt compression 1' on Linux with some drives). Software compression is controlled in the dumptype. > > I have differnt directories to backup, and i want to pack them in > _one_ big package, so i specify a chunk size of 20GB, but Amanda > creates for each entry in the disklist one package/file. Yes, that's how it works. Each disk list entry has to be a separate file. > A hardware question: If i have many packages to flush out to tape, are > they written at once so that the tape comes into the streaming mode or > does the tape have to be stopped and restartet for each package newly? Amanda does it's best to keep the tape streaming. > What happens if i delete some files in the holding disk manually? > Does it have consequences and the database is corrupted? Amanda will think that those directories got backed up, but you don't have 'em any more. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University