My backup has this as the instruction block, for my first file on the tape
(after the label block):
AMANDA: SPLIT_FILE 20190624200002 <node.FQDN> /boot part 1/-1 lev 1 comp
.gz program /
sbin/dump
ORIGSIZE=52
DLE=<<ENDDLE
<dle>
<program>DUMP</program>
<disk>/boot</disk>
<level>1</level>
<auth>krb5</auth>
<compress>SERVER-FAST</compress>
<record>YES</record>
<index>YES</index>
<datapath>AMANDA</datapath>
</dle>
ENDDLE
To restore, position tape at start of file and run:
dd if=<tape> bs=512k skip=1 | /bin/gzip -dc | /sbin/restore -xpGf - …
I’m running amanda 3.3.8 so yes, it mentions the block size.
However, you have to already know it (or guess at something bigger?)
to get the block off tape.
I used dd and “more" to look at that info. I store an empty reminder file
(in my recovery temp area)
titled USE-BS-512k
to remind myself what to use. I had to guess at several sizes & try them,
before
I decided to create that reminder file.
Deb Baddorf
Fermilab
> On Jun 24, 2019, at 7:22 PM, Jon LaBadie <[email protected]> wrote:
>
> I sent the following note to Steve. I don't have facilities
> to check if my comments are correct. Anyone care to comment
> or check?
>
> On Wed, Jun 19, 2019 at 07:37:23PM +0200, Stefan G. Weichinger wrote:
> ...
>>
>> $ amrestore --config abt -b 2097152 /dev/nst0 jupi smb_revision
>>
>> seems to work now ... at least it starts searching.
>>
>> I don't know why I have to tell that ... but it seems I have a mismatch:
>>
>> tapetype says 32 kbytes:
>>
>> define tapetype LTO-4 {
>> comment "Created by amtapetype; compression disabled; 2017-10-31
>> sgw"
>> length 698510208 kbytes
>> filemark 0 kbytes
>> speed 36696 kps
>> blocksize 32 kbytes
>> }
>>
>> changer def sets "2 mbytes":
>>
>> define changer robot {
>> tpchanger "chg-robot:/dev/sg1"
>> property "tape-device" "0=tape:/dev/nst0"
>> device-property "BLOCK_SIZE" "2 mbytes"
>> device-property "READ_BLOCK_SIZE" "2 mbytes"
>> property "eject-before-unload" "no"
>> property "use-slots" "1-24"
>> changerfile "/etc/amanda/abt/chg-robot-dev-sg1"
>> }
>>
>> storage def pulls in both:
>>
>> define storage abt {
>> tapepool "abt"
>> tapetype "LTO-4"
>> tpchanger "robot"
>> [..]
>> }
>>
>> Maybe then amrecover would also work (bailed out before as well)
>>>> End of included message <<<
>
> I don't think LTO-4 will use a 32K blocksize. Minimum is probably
> over 1M. 32K in tapetype is just what you said via command line
> or letting it default. Amrestore is probably just reading this
> and knowing, or testing, that LT0-4 won't take 32K BS.
>
> Pull off of a tape the first file. It will be named "00000.<tapename>".
> I think it will be 1 tape block in size. But contain < 32K of data.
>
> Pull off the first data file of a DLE and look at the first 32K.
> One of mine ends with this:
>
> To restore, position tape at start of file and run:
> dd if=<tape> bs=32k skip=1 | /usr/bin/gzip -d | /usr/libexec/
> amanda/application/amgtar restore [./file-to-restore]+
>
> The "bs=32K" in my command line may be the BS actually used.
>
> Jon
> --
> Jon H. LaBadie [email protected]
> 11226 South Shore Rd. (703) 787-0688 (H)
> Reston, VA 20190 (703) 935-6720 (C)
