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Full Discussion: Why is restore slower than backup?
Operating Systems Solaris Why is restore slower than backup? Post 68915 by RTM on Friday 8th of April 2005 10:28:24 AM
Old 04-08-2005
Restores slower than backups - Part of the explaination I don't totally agree with (an assumption that there is a backup server
Quote:
Essentially, a backup is not much more that a read operation. Data is simply read from the backup client and sent to the backup server.
) Data is sometimes read and then written to the backup tape from the same server. And writing to tape could be a blockage but otherwise his points are good.
 

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LEARN ABOUT CENTOS

tapeinfo

TAPEINFO(1)						      General Commands Manual						       TAPEINFO(1)

NAME

       tapeinfo - report SCSI tape device info

SYNOPSIS

       tapeinfo -f <scsi-generic-device>

DESCRIPTION

       The  tapeinfo  command  reads  various information from SCSI tape drives that is not generally available via most vendors' tape drivers. It
       issues raw commands directly to the tape drive, using either the  operating  system's  SCSI  generic  device  (	e.g.  /dev/sg0	on  Linux,
       /dev/pass0 on FreeBSD) or the raw SCSI I/O ioctl on a tape device on some operating systems.

       One  good  time	to  use 'tapeinfo' is immediately after a tape i/o operation has failed. On tape drives that support HP's 'tapealert' API,
       'tapeinfo' will report a more exact description of what went wrong.

       Do be aware that 'tapeinfo' is not a substitute for your operating system's own 'mt' or similar tape driver control program. It is intended
       to supplement, not replace, programs like 'mt' that access your operating system's tape driver in order to report or set information.

OPTIONS

       The first argument, given following -f , is the SCSI generic device corresponding to your tape drive.  Consult your operating system's doc-
       umentation for more information (for example, under Linux these are generally start at /dev/sg0 under FreeBSD these start at /dev/pass0).

       Under FreeBSD, 'camcontrol devlist' will tell you what SCSI devices you have, along with which 'pass' device controls  them.  Under  Linux,
       "cat /proc/scsi/scsi" will tell you what SCSI devices you have.

BUGS AND LIMITATIONS

       This program has only been tested on Linux with a limited number of tape drives (HP DDS4, Seagate AIT).

AVAILABILITY

       tapeinfo  is  currently	being maintained by Robert Nelson <robertnelson@users.sourceforge.net> as part of the 'mtx' suite of programs. The
       'mtx' home page is http://mtx.sourceforge.net  and  the	actual	code  is  currently  available	there  and  via  SVN  from  http://source-
       forge.net/projects/mtx.

SEE ALSO

       mt(1),mtx(1),scsitape(1),scsieject(1),loaderinfo(1)

								    TAPEINFO1.0 						       TAPEINFO(1)
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