Date: Sun, 6 Apr 2003 14:49:30 +0000 From: "Nathan Vidican" <nathan@vidican.com> To: questions@freebsd.org Subject: Problems with dump/capacity/DLT IV 40-80GB Tape cartridges Message-ID: <20030406144727.M85382@vidican.com>
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I am trying to make use of dump to backup several volumes to a DLT IV tape drive. I am using a Dell PowerEdge 110T, which contains a single DLT IV 40/80GB tape drive unit attached to the external connector of an Adaptec 3940UW pci-scsi host adaptor. The tape drive is at ID 1, the controller at ID 0, and there are no other devices attached to this controller. There are no apparent hardware related problems, just noting this to keep things on track: dmesg | grep sa0 returns the following: sa0 at ahc1 bus 0 target 1 lun 0 sa0: <BNCHMARK DLT1 391B> Removable Sequential Access SCSI-2 device sa0: 20.000MB/s transfers (10.000MHz, offset 8, 16bit) Output of 'df' returns the following: Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/aacd0s1a 2064302 64488 1834670 3% / /dev/aacd2s1e 70558134 4227862 60685622 7% /server /dev/aacd0s1f 6132382 1363156 4278636 24% /usr /dev/aacd0s1e 8257742 124818 7472306 2% /var procfs 4 4 0 100% /proc The Problem: ~~~~~~~~~~~~ When using 'dump -0au -f /dev/sa0 /server' I cannot fit the contents of /server (approx 4.2gigs of data) onto a single tape volume. The tape inserted is a brand new HP C5141F, (which is a 40/80GB DLT IV cartidge). Dump prompts for a new tape to be inserted to complete the operation. I assumed this had to do with the '-a' part in the dump command; assuming that dump is therefore not (properly) auto-detecting the EOT (end of tape), or using the wrong recording density and reaching the end of the tape all too quickly. Using 'restore -i' I can indeed read the data written to the tape, so it is writting the data... just not properly. The Question: ~~~~~~~~~~~~~ Is anyone out there using similar hardware, or know of the proper arguments to pass to dump to make full use of the capacity of these DLT IV cartridges? I have checked HP's website, and these particular cartidges list a length of 557Meters, and a density of 46.8K/80K/96K dependant upon 40GB/70GB/80GB compression schemes. How do I formulate the dump command to properly make use of these tapes.... any suggestions? -- Nathan Vidican nathan@vidican.com Innovative Product Sales http://www.InnovativeProductSales.com/
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