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Start copying large file while its still being restored from tape

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Top Forums Shell Programming and Scripting Start copying large file while its still being restored from tape
# 8  
Old 07-15-2011
I'd still recommend some way to verify the entire file made it across, like an md5 sum on both sides.

Read-behind-write is fraught with lots of chances to not get the entire file. You pretty much have to know that your entire software stack is set up properly. Even in the sleep-then-cat example, and even if the network is supposedly guaranteed to be slower than the tape, any hiccup reading the tape - or in the data path from tape to disk - could allow the cat to catch up with the file end.

Never mind what happens if you run into a restore process that sets the file length prior to actually writing out the data....
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LEARN ABOUT REDHAT

amlabel

AMLABEL(8)						      System Manager's Manual							AMLABEL(8)

NAME

       amlabel - label an Amanda tape

SYNOPSIS

       amlabel [-f] config label [ slot slot ]

DESCRIPTION

       All Amanda tapes must be pre-labeled before they are used.  Amanda verifies the label in amdump and amflush before writing to make sure the
       proper tape is loaded.

       Amlabel writes an Amanda label on the tape in the device specified by the amanda.conf file in /etc/amanda/config.  Label may be any  string
       that does not contain whitespace and that matches the amanda.conf labelstr regular expression option.  It is up to the system administrator
       to define a naming convention.

       Amlabel appends the new tape to the tapelist file so it will be used by Amanda before it reuses any other tapes.  When you amlabel multiple
       tapes, they will be used in the order you amlabel them.

       Amlabel will not write the label if the tape contains an active Amanda tape or if the label specified is on an active tape.  The -f (force)
       flag bypasses these verifications.

       An optional slot may be specified after the tape label.	If a tape changer is in use, amlabel will label the tape  in  the  specified  slot
       instead of the currently loaded tape.

       See the amanda(8) man page for more details about Amanda.

EXAMPLE

       Write  an  Amanda  label  with  the  string  "DMP000"  on  the  tape loaded in the device named in the tapedev option in /etc/amanda/Daily-
       Set1/amanda.conf:

	      % amlabel DailySet1 DMP000

       Label the tape in slot 3 of the currently configured tape changer with the string "DMP003":

	      % amlabel DailySet1 DMP003 slot 3

MESSAGES

       label label doesn't match labelstr "str"
	      Label label on the command line does not match the labelstr regular expression str from amanda.conf.

       label label already on a tape
	      Label label is already listed as an active Amanda tape.

       no tpchanger specified in "path", so slot command invalid
	      The command line has the slot parameter but the amanda.conf file in path does not have a tape changer configured.

       reading label label, tape is in another amanda configuration
	      This tape appears to be a valid Amanda tape, but label does not match labelstr for this configuration so it is probably  part  of  a
	      different Amanda configuration.

       reading label label, tape is active
	      Tape label appears to already be part of this Amanda configuration and active, i.e. has valid data on it.

       no label found, are you sure tape is non-rewinding?
	      While  checking  that  the  label  was written correctly, amlabel got an error that might be caused by mis-configuring Amanda with a
	      rewinding tape device name instead of a non-rewinding device name for tape.

AUTHOR

       James da Silva <jds@cs.umd.edu>
       University of Maryland, College Park

SEE ALSO

       amanda(8) amdump(8) amflush(8)

																	AMLABEL(8)