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From: "Nelson H. F. Beebe" <beebe@math.utah.edu>
To: The Unix Heritage Society mailing list <tuhs@tuhs.org>
Subject: Re: [TUHS] Abstractions
Date: Tue, 23 Feb 2021 19:23:01 -0700	[thread overview]
Message-ID: <CMM.0.95.0.1614133381.beebe@gamma.math.utah.edu> (raw)
In-Reply-To: <m1lEjKq-0036urC@more.local>

Greg Woods responds to my posting:

>> Hmmmm... you may just be mixing up the names of the archive tools you
>> mean, but on the other hand maybe you don't know that "dump" does whole
>> filesystems, not just sub-directories.

I meant "dump" as a generic verb, not specifically the Unix dump
utility.  Many sites also used tar to backup directory trees: after
all, tar means Tape ARchiver.

>> Original Unix dump(1m) had no trouble asking for additional tapes ...

That was, however, contingent on a reliable signal from the tape unit,
and my strong recollection is that when we moved to various types of
cheap cassette tapes, the end-of-tape indicator was unreliable.  Thus,
we paid attention to both disk and tape sizes.

Today, with 10TB+ on LTO-8 tapes, it isn't an issue for us, and we
also tend to have many different ZFS volumes representing various
parts of the filesystem, allowing different backup and snapshotting
policies.  Besides tapes and snapshots, we also have a live SAN
mirror, and a remote snapshot server, giving plenty of data
replication, and the warm fuzzy feelings from that.  After 20 years of
ZFS, I don't recall us ever losing data.  We have also gone through
two generations of major fileserver upgrades and complete data
migrations without service interruptions (except for a brief interval
for each user account to synchronize data on old and new servers).

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe@math.utah.edu  -
- 155 S 1400 E RM 233                       beebe@acm.org  beebe@computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------

  reply	other threads:[~2021-02-24  2:23 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 19:37 Nelson H. F. Beebe
2021-02-23 21:02 ` Charles H. Sauer
2021-02-23 21:15   ` Henry Bent
2021-02-24  2:47     ` Greg A. Woods
2021-02-24  3:20       ` Warner Losh
2021-02-24 20:05         ` Greg A. Woods
2021-02-24  1:51 ` Greg A. Woods
2021-02-24  2:23   ` Nelson H. F. Beebe [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-02-24  4:18 Rudi Blom
2021-02-21 10:47 Paul Ruizendaal
2021-02-20 23:09 M Douglas McIlroy
2021-02-21  8:15 ` Otto Moerbeek
2021-02-21 11:08 ` Rich Morin
2021-02-21 22:40 ` Dave Horsfall
2021-02-21 23:01   ` Steve Nickolas
2021-02-23  3:31     ` Andrew Warkentin
2021-02-22  0:13   ` Warren Toomey
2021-02-27  2:47     ` Dave Horsfall
2021-02-23  0:25   ` Wesley Parish
2021-02-23  0:38     ` Steve Nickolas
2021-02-23  2:50       ` Theodore Ts'o
2021-02-23  3:19         ` Warner Losh
2021-02-23  1:47     ` Theodore Ts'o
2021-02-21 22:54 ` Clem Cole
2021-02-15 19:56 Jon Steinhart
2021-02-15 21:52 ` Dave Horsfall
2021-02-16  7:13   ` arnold
2021-02-16  8:15 ` Tom Ivar Helbekkmo via TUHS
2021-02-16 10:04   ` Wesley Parish
2021-02-16 19:59   ` Jon Steinhart
2021-02-17  4:01     ` Theodore Ts'o
2021-02-17  6:50     ` Chris Hanson
2021-02-16 12:26 ` Rich Morin
2021-02-16 22:46 ` Steffen Nurpmeso
2021-02-17 12:09 ` David Arnold

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