Andreas Klemm's patch set for dump(8), with some minor (cosmetic)
changes and one addition by me. . Use reasonable defaults for the tape drive (/dev/rst0) instead of something we actually don't have. . Add a summary line displaying the alapsed time and the total throughput. . Replace "rmt" for the remote location of rmt(8) by "/etc/rmt", since this is the historical protocol, and relying on the $PATH causes a big pain. Make it adjustable via an environmental variable though. Reviewed by: joerg (for Andreas' part) Submitted by: andreas@knobel.gun.de (Andreas Klemm)
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joerg
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@ -102,10 +102,10 @@ Write the backup to
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.Ar file
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may be a special device file
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like
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.Pa /dev/rmt12
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.Pa /dev/rst0
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(a tape drive),
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.Pa /dev/rsd1c
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(a disk drive),
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.Pa /dev/rfd1
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(a floppy disk drive),
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an ordinary file,
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or
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.Ql Fl
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@ -122,6 +122,12 @@ or
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.Nm dump
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writes to the named file on the remote host using
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.Xr rmt 8 .
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The default path name of the remote
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.Xr rmt 8
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program is
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.Pa /etc/rmt ;
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this can be overridden by the environment variable
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.Ev RMT .
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.It Cm d Ar density
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Set tape density to
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.Ar density .
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@ -256,7 +262,7 @@ to minimize the number of tapes follows:
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.It
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Always start with a level 0 backup, for example:
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.Bd -literal -offset indent
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/sbin/dump 0uf /dev/nrst1 /usr/src
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/sbin/dump 0uf /dev/nrst0 /usr/src
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.Ed
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.Pp
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This should be done at set intervals, say once a month or once every two months,
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@ -280,9 +286,15 @@ used, also on a cyclical basis.
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.Pp
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After several months or so, the daily and weekly tapes should get
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rotated out of the dump cycle and fresh tapes brought in.
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.Sh ENVIRONMENT
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The environment variable
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.Ev RMT
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will be used to determine the pathname of the remote
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.Xr rmt 8
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program.
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.Sh FILES
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.Bl -tag -width /etc/dumpdates -compact
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.It Pa /dev/rmt8
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.It Pa /dev/rst0
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default tape unit to dump to
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.It Pa /etc/dumpdates
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dump date records
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@ -311,6 +323,11 @@ Each reel requires a new process, so parent processes for
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reels already written just hang around until the entire tape
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is written.
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.Pp
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restore(8) is currently unable to restore dumps that were created
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with a blocksize larger than 32 on some tape drives. This is likely
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a bug in the tape driver. Workaround for safety reasons:
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dump aborts with an error message when choosing a blocksize > 32.
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.Pp
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.Nm Dump
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with the
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.Cm W
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@ -79,6 +79,7 @@ int notify; /* notify operator flag */
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int blockswritten; /* number of blocks written on current tape */
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int tapeno; /* current tape number */
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time_t tstart_writing; /* when started writing the first tape block */
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time_t tend_writing; /* after writing the last tape block */
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struct fs *sblock; /* the file system super block */
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char sblock_buf[MAXBSIZE];
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long dev_bsize; /* block size of underlying disk device */
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@ -113,6 +113,7 @@ void
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rmtgetconn()
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{
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register char *cp;
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register const char *rmt;
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static struct servent *sp = NULL;
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static struct passwd *pwd = NULL;
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#ifdef notdef
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@ -143,8 +144,10 @@ rmtgetconn()
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rmtpeer = ++cp;
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} else
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tuser = pwd->pw_name;
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if ((rmt = getenv("RMT")) == NULL)
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rmt = _PATH_RMT;
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rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
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_PATH_RMT, (int *)0);
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rmt, (int *)0);
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size = ntrec * TP_BSIZE;
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if (size > 60 * 1024) /* XXX */
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size = 60 * 1024;
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@ -77,7 +77,7 @@ static char sccsid[] = "@(#)main.c 8.4 (Berkeley) 4/15/94";
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int notify = 0; /* notify operator flag */
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int blockswritten = 0; /* number of blocks written on current tape */
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int tapeno = 0; /* current tape number */
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int density = 0; /* density in bytes/0.1" */
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int density = 0; /* density in bytes/0.1" " <- this is for hilit19 */
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int ntrec = NTREC; /* # tape blocks in each tape record */
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int cartridge = 0; /* Assume non-cartridge tape */
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long dev_bsize = 1; /* recalculated below */
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@ -167,6 +167,13 @@ main(argc, argv)
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case 'b': /* blocks per tape write */
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ntrec = numarg('b', "number of blocks per write",
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1L, 1000L, &argc, &argv);
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/* XXX restore is unable to restore dumps that
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were created with a blocksize larger than 32K.
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Possibly a bug in the scsi tape driver. */
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if ( ntrec > 32 ) {
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msg("please choose a blocksize <= 32\n");
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exit(X_ABORT);
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}
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break;
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case 'B': /* blocks per output file */
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@ -236,6 +243,7 @@ main(argc, argv)
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* 9-track 6250 bpi (625 bytes/.1") 2300 ft.
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* cartridge 8000 bpi (100 bytes/.1") 1700 ft.
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* (450*4 - slop)
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* hilit19 hits again: "
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*/
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if (density == 0)
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density = cartridge ? 100 : 160;
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@ -362,12 +370,12 @@ main(argc, argv)
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fetapes =
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( tapesize /* blocks */
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* TP_BSIZE /* bytes/block */
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* (1.0/density) /* 0.1" / byte */
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* (1.0/density) /* 0.1" / byte " */
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+
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tapesize /* blocks */
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* (1.0/ntrec) /* streaming-stops per block */
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* 15.48 /* 0.1" / streaming-stop */
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) * (1.0 / tsize ); /* tape / 0.1" */
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* 15.48 /* 0.1" / streaming-stop " */
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) * (1.0 / tsize ); /* tape / 0.1" " */
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} else {
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/* Estimate number of tapes, for old fashioned 9-track
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tape */
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@ -375,12 +383,12 @@ main(argc, argv)
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fetapes =
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( tapesize /* blocks */
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* TP_BSIZE /* bytes / block */
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* (1.0/density) /* 0.1" / byte */
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* (1.0/density) /* 0.1" / byte " */
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+
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tapesize /* blocks */
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* (1.0/ntrec) /* IRG's / block */
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* tenthsperirg /* 0.1" / IRG */
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) * (1.0 / tsize ); /* tape / 0.1" */
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* tenthsperirg /* 0.1" / IRG " */
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) * (1.0 / tsize ); /* tape / 0.1" " */
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}
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etapes = fetapes; /* truncating assignment */
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etapes++;
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@ -440,14 +448,24 @@ main(argc, argv)
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(void)dumpino(dp, ino);
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}
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(void)time((time_t *)&(tend_writing));
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spcl.c_type = TS_END;
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for (i = 0; i < ntrec; i++)
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writeheader(maxino - 1);
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if (pipeout)
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msg("DUMP: %ld tape blocks\n",spcl.c_tapea);
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msg("%ld tape blocks\n", spcl.c_tapea);
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else
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msg("DUMP: %ld tape blocks on %d volumes(s)\n",
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msg("%ld tape blocks on %d volumes(s)\n",
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spcl.c_tapea, spcl.c_volume);
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/* report dump performance, avoid division through zero */
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if (tend_writing - tstart_writing == 0)
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msg("finished in less than a second\n");
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else
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msg("finished in %d seconds, throughput %d KBytes/sec\n",
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tend_writing - tstart_writing,
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spcl.c_tapea / (tend_writing - tstart_writing));
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putdumptime();
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trewind();
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broadcast("DUMP IS DONE!\7\7\n");
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@ -35,8 +35,8 @@
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#include <paths.h>
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#define _PATH_DEFTAPE "/dev/rmt8"
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#define _PATH_DEFTAPE "/dev/rst0"
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#define _PATH_DTMP "/etc/dtmp"
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#define _PATH_DUMPDATES "/etc/dumpdates"
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#define _PATH_LOCK "/tmp/dumplockXXXXXX"
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#define _PATH_RMT "rmt"
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#define _PATH_RMT "/etc/rmt"
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