Blocksize and Compression on 2550 TBU
krice at TLCdelivers.com
Sun Aug 25 17:51:00 CDT 2002
Box is a PE 2550, (Tag B694811)
The TBU is:
Vendor: ARCHIVE Model: Python 06408-XXX Rev: 8160
Type: Sequential-Access ANSI SCSI revision: 03
Star: 1.5a06 (installed only star binary and man page, not mt from the star package)
Data to be backed up: ~60GB, averages 20,000 bytes per file, files are mix of JPG's and
very small HTML's/XML's.
FileSystem: Currently Ext2, but soon to be a reiserfs.
I need to backup about 60GB of data, and am trying to determine the right "options".
(The tapes themselves are 20GB-native/40GB-compressed)
I'm currently doing a backup with:
star -cv bs=32k -f /dev/nst0 .
1. Is that blocksize proper, or should it not even be specified?
(Tried www.linuxtapecert.org, no help for this drive)
2. Regarding compression of the data, would this be right?:
star -c . |gzip | sdd ibs=4k obs=32k -fill of=/dev/nst0
I didn't include "ovsize", could that be inserted after "-fill" as: "ovsize=40g" ?
Also, could this enable me to possibly backup all 60GB of data to one tape, although I
know I'm dealing with JPG's?
3. Is hardware compression used by default, without having to be specified?
Or should I export "STAR_COMPRESS_FLAG=-9" first?
Sorry, I know this is perhaps more Star related than Dell, but it COULD be helpful to others using
Thank you in advance, I hope I've given enough info.
The Library Corporation
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