Top Document: comp.sys.hp.hpux FAQ Previous Document: 5.2.2 How can I use dump with a DDS tape? Next Document: 5.2.4 What CD burning software is available? See reader questions & answers on this topic! - Help others by sharing your knowledge Added: 04/17/01 cpio/tar = VERY VERY OLD - never designed for DDS or DLT[TM] fbackup/ftio = designed for Gb backups and modern tape drives However, the default for fbackup is 1/2" magtapes, which almost no one uses anymore. ALWAYS use a config file for fbackup with at least these options: blocksperrecord 256 records 32 checkpointfreq 1024 readerprocesses 6 maxretries 5 retrylimit 5000000 maxvoluses 200 filesperfsm 2000 Check the manpage for fbackup for other parameters, including what to do when you run out of tape (the chgvol parameter). You need huge block sizes for modern tapes. Try ftio (block size limited only by hardware), pax (block sizes up to 32k), tar (which is 10k, by design) or cpio -B which changes from 512 to 5k (but still too small). cpio, tar, dump, pax and similar utils can NEVER backup large files and are single processes whereas fbackup can read from 6 different files at the same time. Note, the large record size (blocksperrecord), checkpointfreq, and filesperfsm also contribute to tape overhead. User Contributions:Top Document: comp.sys.hp.hpux FAQ Previous Document: 5.2.2 How can I use dump with a DDS tape? Next Document: 5.2.4 What CD burning software is available? Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: hpux.faq@gmail.com
Last Update March 27 2014 @ 02:11 PM
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