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Jim Mock 2001-08-11 20:35:41 +00:00
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Notes: svn2git 2020-12-08 03:00:23 +00:00 
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22
en_US.ISO8859-1/books/handbook/backups/chapter.sgml
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<!-- <!--
The FreeBSD Documentation Project 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"> <chapter id="backups">
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drives in a single cabinet with automatic tape changing. Library drives in a single cabinet with automatic tape changing. Library
capacities reach 240 GB.</para> capacities reach 240 GB.</para>
<para>The DDS-3 standard now supports tape capacities up to 12GB (or <para>The DDS-3 standard now supports tape capacities up to 12 GB (or
24GB compressed).</para> 24 GB compressed).</para>
<para>4mm drives, like 8mm drives, use helical-scan. All the benefits <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> and drawbacks of helical-scan apply to both 4mm and 8mm drives.</para>
@ -66,7 +66,7 @@
</indexterm> </indexterm>
<para>8mm tapes are the most common SCSI tape drives; they are the best <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 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). 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 One downside of 8mm tape is relatively short head and tape life due to
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with 6 drives and 120 tapes in a single cabinet. Tapes are changed with 6 drives and 120 tapes in a single cabinet. Tapes are changed
automatically by the unit. Library capacities reach 840+ GB.</para> automatically by the unit. Library capacities reach 840+ GB.</para>
<para>The Exabyte <quote>Mammoth</quote> model supports 12GB on one tape <para>The Exabyte <quote>Mammoth</quote> model supports 12 GB on one tape
(24GB with compression) and costs approximately twice as much as (24 GB with compression) and costs approximately twice as much as
conventional tape drives.</para> conventional tape drives.</para>
<para>Data is recorded onto the tape using helical-scan, the heads are <para>Data is recorded onto the tape using helical-scan, the heads are
@ -156,13 +156,13 @@
itself.</para> itself.</para>
<para>Data throughput is approximately 1.5MB/s, three times the throughput of <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 for a single drive. Drives are available in both multi-tape changers
and multi-tape, multi-drive tape libraries containing from 5 to 900 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> 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> capacity.</para>
<para>Data is recorded onto the tape in tracks parallel to the direction <para>Data is recorded onto the tape in tracks parallel to the direction
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<secondary>AIT</secondary> <secondary>AIT</secondary>
</indexterm> </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 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 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 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> &man.ssh.1;.</para>
<example> <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 \ <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> targetuser@targetmachine.example.com dd of=/mybigfiles/dump-usr-l0.gz</userinput></screen>