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Jim Mock 2001-08-11 20:35:41 +00:00
parent f43590590d
commit a1c6393eb2
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=10310
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22
en_US.ISO8859-1/books/handbook/backups/chapter.sgml
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@ -1,7 +1,7 @@
<!--
The FreeBSD Documentation Project
$FreeBSD: doc/en_US.ISO8859-1/books/handbook/backups/chapter.sgml,v 1.39 2001/08/06 22:59:23 chern Exp $
$FreeBSD: doc/en_US.ISO8859-1/books/handbook/backups/chapter.sgml,v 1.40 2001/08/10 22:58:09 chern Exp $
-->
<chapter id="backups">
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drives in a single cabinet with automatic tape changing. Library
capacities reach 240 GB.</para>
<para>The DDS-3 standard now supports tape capacities up to 12GB (or
24GB compressed).</para>
<para>The DDS-3 standard now supports tape capacities up to 12 GB (or
24 GB compressed).</para>
<para>4mm drives, like 8mm drives, use helical-scan. All the benefits
and drawbacks of helical-scan apply to both 4mm and 8mm drives.</para>
@ -66,7 +66,7 @@
</indexterm>
<para>8mm tapes are the most common SCSI tape drives; they are the best
choice of exchanging tapes. Nearly every site has an exabyte 2 GB 8mm
choice of exchanging tapes. Nearly every site has an Exabyte 2 GB 8mm
tape drive. 8mm drives are reliable, convenient and quiet. Cartridges
are inexpensive and small (4.8 x 3.3 x 0.6 inches; 122 x 84 x 15 mm).
One downside of 8mm tape is relatively short head and tape life due to
@ -79,8 +79,8 @@
with 6 drives and 120 tapes in a single cabinet. Tapes are changed
automatically by the unit. Library capacities reach 840+ GB.</para>
<para>The Exabyte <quote>Mammoth</quote> model supports 12GB on one tape
(24GB with compression) and costs approximately twice as much as
<para>The Exabyte <quote>Mammoth</quote> model supports 12 GB on one tape
(24 GB with compression) and costs approximately twice as much as
conventional tape drives.</para>
<para>Data is recorded onto the tape using helical-scan, the heads are
@ -156,13 +156,13 @@
itself.</para>
<para>Data throughput is approximately 1.5MB/s, three times the throughput of
4mm, 8mm, or QIC tape drives. Data capacities range from 10GB to 20GB
4mm, 8mm, or QIC tape drives. Data capacities range from 10 GB to 20 GB
for a single drive. Drives are available in both multi-tape changers
and multi-tape, multi-drive tape libraries containing from 5 to 900
tapes over 1 to 20 drives, providing from 50GB to 9TB of
tapes over 1 to 20 drives, providing from 50 GB to 9 TB of
storage.</para>
<para>With compression, DLT Type IV format supports up to 70GB
<para>With compression, DLT Type IV format supports up to 70 GB
capacity.</para>
<para>Data is recorded onto the tape in tracks parallel to the direction
@ -179,7 +179,7 @@
<secondary>AIT</secondary>
</indexterm>
<para>AIT is a new format from Sony, and can hold up to 50GB (with
<para>AIT is a new format from Sony, and can hold up to 50 GB (with
compression) per tape. The tapes contain memory chips which retain an
index of the tape's contents. This index can be rapidly read by the
tape drive to determine the position of files on the tape, instead of
@ -289,7 +289,7 @@ sa0(ncr1:4:0): Logical unit is in process of becoming ready</screen>
&man.ssh.1;.</para>
<example>
<title>Using <command>rdump</command> over ssh</title>
<title>Using <command>rdump</command> over <application>ssh</application></title>
<screen>&prompt.root; <userinput>/sbin/dump -0uan -f - /usr | gzip -2 | ssh1 -c blowfish \
targetuser@targetmachine.example.com dd of=/mybigfiles/dump-usr-l0.gz</userinput></screen>