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authorChris Timmons <cwt@FreeBSD.org>1998-02-18 14:23:40 +0000
committerChris Timmons <cwt@FreeBSD.org>1998-02-18 14:23:40 +0000
commitb92bbb4ef137f82206bafe3f737d0ce81b7c164f (patch)
tree9790fc6b3acfdee3788c0dd006390329cab29a45 /misc/amanda32-server/pkg-descr
parent94bb45af19506b97243c01c719d514bdc20aca1f (diff)
downloadports-b92bbb4ef137f82206bafe3f737d0ce81b7c164f.tar.gz
ports-b92bbb4ef137f82206bafe3f737d0ce81b7c164f.zip
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+
+** CAUTION **
+
+THIS BETA RELEASE OF AMANDA 2.4 BREAKS BACKWARDS COMPATIBILITY WITH
+EARLIER AMANDA CLIENTS (PER CHANGES FILE IN THE DISTRIBUTION.)
+
WHAT IS AMANDA?
---------------
-This is an alpha-test release of Amanda, the Advanced Maryland Automatic
+This is a release of Amanda, the Advanced Maryland Automatic
Network Disk Archiver. Amanda is a backup system designed to archive many
-computers on a network to a single large-capacity tape drive. This release
-is currently in daily use at the University of Maryland at College Park
-Computer Science Department, backing up all the disks on all the
-workstations in the department: currently over 70 gigabytes of data across
-more than 400 filesystems on more than 146 workstations and servers, using
-a single 5 Gigabyte Exabyte EXB-8500. Here are some features of Amanda:
+computers on a network to a single large-capacity tape drive.
+
+Here are some features of Amanda:
* written in C, freely distributable.
- * built on top of standard backup software: BSD Unix dump/restore, and
+ * built on top of standard backup software: Unix dump/restore, and
later GNU Tar and others.
* will back up multiple machines in parallel to a holding disk, blasting
finished dumps one by one to tape as fast as we can write files to
tape. For example, a ~2 Gb 8mm tape on a ~240K/s interface to a host
- with a large holding disk can be filled by Amanda in under 4 hours.
+ with a large holding disk can be filled by Amanda in under 4 hours.
* does simple tape management: will not overwrite the wrong tape.
- * supports tape changers via a generic interface. Easily customizable to
- any type of tape carousel, robot, or stacker that can be controlled via
- the unix command line.
- * supports Kerberos 4 security, including encrypted dumps. The Kerberos
- support is available as a separate add-on package, see the file
- KERBEROS.HOW-TO-GET on the ftp site, and the file docs/KERBEROS in this
- package, for more details.
- * for a restore, tells you what tapes you need, and finds the proper
- backup image on the tape for you.
- * recovers gracefully from errors, including down or hung machines.
- * reports results, including all errors in detail, in email to operators.
- * will dynamically adjust backup schedule to keep within constraints: no
- more juggling by hand when adding disks and computers to network.
- * includes a pre-run checker program, that conducts sanity checks on both
- the tape server host and all the client hosts (in parallel), and will
- send an e-mail report of any problems that could cause the backups to
- fail.
- * can compress dumps before sending over net, with either compress or gzip.
- * can optionally syncronize with external backups, for those large
- timesharing computers where you want to do fu--------------------------------------------
-
-Amanda requires a host that is mostly idle at night, with a large capacity
-tape drive (e.g. an EXABYTE or DAT tape). This becomes the "tape server
-host". All the computers you are going to dump are the "backup client
-hosts". The server host can also be a client host.
-
-Amanda works best with one or more large "holding disk" partition on the
-server host available to it for buffering dumps before writing to tape.
-The holding disk allows Amanda to run backups in parallel to the disk, only
-writing them to tape when the backup is finished. Note that the holding
-disk is not required: without it Amanda will run backups sequentially to
-the tape drive. Running it this way kills the great performance, but still
-allows you to take advantage of Amanda's other features.
-
-As a rule of thumb, for best performance the holding disk should be larger
-than the dump output from your largest disk partitions. For example, if
-you are backing up some full gigabyte disks that compress down to 500 MB,
-then you'll want 500 MB on your holding disk. On the other hand, if those
-gigabyte drives are partitioned into 500 MB filesystems, they'll probably
-compress down to 250 MB and you'll only need that much on your holding
-disk. Amanda will perform better with larger holding disks. We use 800 MB
-for our holding disk.
-
-Actually, Amanda will still work if you have full dumps that are larger
-than the holding disk: Amanda will send those dumps directly to tape one at
-a time. If you have many such dumps you will be limited by the dump speed
-of those machines.
-