[OpenAFS] tapeconfig settings for LTO-5 tape drive

John Sopko sopko@cs.unc.edu
Tue, 28 May 2013 13:56:07 -0400


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I am upgrading our tape drives from LTO-3 to LTO-5.
The native uncompressed capacity of LTO-3 tape is 400GigaBytes.
The native uncompressed capacity of LTO-5 tape is 1.5 TeraBytes.

I have always used the compressed mode on the current LTO-3.
And you can get 2 times or more compression.

According to the docs and the output from butc the max tape size
in the /usr/afs/backup/tapeconfig file is 2TB. I set to 8TB and labeled
a tape and it appears to be limited to 2TB as shown below.

I do a full dump then append the incrementals to the same tape.
Does anyone have a recommendation on the tapeconfig settings
for LTO-5?

Also is there a recommended setting for the BUFFERSIZE in the
/usr/afs/backup/CFG_st0 file for LTO-5 tape drives? Thanks for any
help on this matter.

Here is the tapeconfig for our LTO-3 drives:

1500G 0 /dev/st0 0

and the CFG_st0 setting:

BUFFERSIZE 16M

Tried this for the new LTO-5 drive:

8T 0 /dev/st0 3

and get this butc output when labeling a LTO-5 tape:

Labeltape
******* OPERATOR ATTENTION *******
Device :  /dev/st0
Please put in tape to be labelled as <NULL> and hit return when done

Thanks, now proceeding with tape labelling operation.
**********************************
Tape blocks read in 10240 Byte chunks.
Labelled tape <NULL> size 2147483648 Kbytes





-- 
John W. Sopko Jr.                    University of North Carolina
email: sopko AT cs.unc.edu      Computer Science Dept., CB 3175
Phone: 919-962-1844                Fred Brooks Building; Room 140
Fax:   919-962-1799                 Chapel Hill, NC 27599-3175

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<div dir=3D"ltr"><div style>I am upgrading our tape drives from LTO-3 to LT=
O-5.</div><div style>The native uncompressed capacity of LTO-3 tape is 400G=
igaBytes.=A0<br></div>The native uncompressed capacity of LTO-5 tape is 1.5=
 TeraBytes.=A0<div>
<br></div><div>I have always used the compressed mode on the current LTO-3.=
</div><div style>And you can get 2 times or more compression.</div><div sty=
le><br></div><div style>According to the docs and the output from butc the =
max tape size</div>
<div style>in the /usr/afs/backup/tapeconfig file is 2TB. I set to 8TB and =
labeled</div><div style>a tape and it appears to be limited to 2TB as shown=
 below.</div><div style><br></div><div style>I do a full dump then append t=
he incrementals to the same tape.</div>
<div style>Does anyone have a recommendation on the tapeconfig settings</di=
v><div style>for LTO-5?</div><div style><br></div><div style><div>Also is t=
here a recommended setting for the=A0BUFFERSIZE in the</div><div>/usr/afs/b=
ackup/CFG_st0 file for LTO-5 tape drives? Thanks for any</div>
<div>help on this matter.</div></div><div style><br></div><div style>Here i=
s the tapeconfig for our LTO-3 drives:<br></div><div style><br></div><div s=
tyle>1500G 0 /dev/st0 0<br></div><div style><br></div><div style>and the=A0=
CFG_st0 setting:</div>
<div style><br></div><div style>BUFFERSIZE 16M<br></div><div style><br></di=
v><div style>Tried this for the new LTO-5 drive:</div><div><div><br></div><=
div>8T 0 /dev/st0 3</div><div><br></div><div style>and get this butc output=
 when labeling a LTO-5 tape:</div>
<div style><br></div><div style><div>Labeltape</div><div>******* OPERATOR A=
TTENTION *******</div><div>Device : =A0/dev/st0=A0</div><div>Please put in =
tape to be labelled as &lt;NULL&gt; and hit return when done</div><div><br>
</div><div>Thanks, now proceeding with tape labelling operation.</div><div>=
**********************************</div><div>Tape blocks read in 10240 Byte=
 chunks.</div><div>Labelled tape &lt;NULL&gt; size 2147483648 Kbytes</div>
</div><div><br></div><div><br></div><div style><br></div><div style><br></d=
iv><div style><br></div>-- <br>John W. Sopko Jr. =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0University of North Carolina<br>email: sopko AT <a href=3D"h=
ttp://cs.unc.edu" target=3D"_blank">cs.unc.edu</a> =A0 =A0 =A0Computer Scie=
nce Dept., CB 3175<br>
Phone: 919-962-1844 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Fred Brooks Building; Ro=
om 140<br>Fax: =A0 919-962-1799 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Chapel Hill=
, NC 27599-3175
</div></div>

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