[Veritas-bu] Some drives running slower than others ? Anyone seen this,

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One of the classic problems with DLT drives (not SDLT) is that most
contamination is environmental and is drawn into the drive by the forced
air cooling system in the case or library. The leader that pulls the
tape through the tape path to the take-up reel gets as dirty as the head
and tape path, but because there is no way for the cleaning tape to
clean the leader it just gets dirtier as time passes. This leader is
passing over the R/W head on every load and unload, depositng dirt back
onto the head. This is why you often see the cleaning light come back on
after one or two tape loads following a clean. The only solution is to
get your hardware engineer to clean the leader or replace it.
=20
Mike Wright

Morgan Stanley

Data Protection Engineering

20 Cabot Square | Canary Wharf | London W14 4QW

Tel +44 207 6774728 | Mob +44 7921 777992

=20

________________________________

From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of len boyle
Sent: 08 November 2005 14:17
To: Richard Hellier; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Some drives running slower than others ?
Anyone seen this, please?


We have seen this when the tape drive  and/or tape cart are failing. Do
you see the cleaning light on the tape drive. With the dlt7000 the
cleaning light came on when the drive had an ioerror. Cleaning may or
may not clear up the problem. I believe that most of the time cleaning
does not clear up the problem.=20
The ce can check the error logs in the drive and let you know if
multiple tapes are having the same problem.
=20
len

        ----- Original Message -----=20
        From: Richard Hellier <mailto:richard_hellier AT hotmail DOT com> =20
        To: veritas-bu AT mailman.eng.auburn DOT edu=20
        Sent: Tuesday, November 08, 2005 4:44 AM
        Subject: [Veritas-bu] Some drives running slower than others ?
Anyone seen this, please?


        We have an ATL P3000 library with 5 DLT drives.  Just recently,
backups that happen to land on two particular drives among the five seem
to run much more slowly than expected. Anyone else seen anything like
this, please, and can suggest a remedy?

        =20

        Thanks!

        =20

        Richard.
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D860123611-09112005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>One of the classic problems with DLT drives =
(not SDLT) is=20
that most contamination is environmental and is drawn into the drive by=20
the&nbsp;forced air cooling system in the case or library. The leader =
that pulls=20
the tape through the tape path to the take-up reel gets as dirty as the =
head and=20
tape path, but because there is no way for the cleaning tape to clean =
the leader=20
it just gets dirtier as time passes. This leader is passing over the R/W =
head on=20
every load and unload, depositng dirt back onto the head. This is why =
you often=20
see the cleaning light come back on after one or two tape loads =
following a=20
clean. The only solution is to get your hardware engineer to clean the =
leader or=20
replace it.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D860123611-09112005><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
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size=3D3>Mike=20
Wright<o:p></o:p></FONT></SPAN></U></B></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt"><B=20
style=3D"mso-bidi-font-weight: normal"><SPAN lang=3DEN-GB=20
style=3D"FONT-SIZE: 8pt; FONT-FAMILY: Arial; mso-ansi-language: =
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Stanley<o:p></o:p></SPAN></B></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt"><B=20
style=3D"mso-bidi-font-weight: normal"><SPAN lang=3DEN-GB=20
style=3D"FONT-SIZE: 8pt; FONT-FAMILY: Arial; mso-ansi-language: =
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Protection Engineering<o:p></o:p></SPAN></B></P>
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|=20
<st1:PlaceName w:st=3D"on">Canary</st1:PlaceName> <st1:PlaceType=20
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style=3D"FONT-SIZE: 8pt; FONT-FAMILY: Arial; mso-ansi-language: =
EN-GB">Tel +44 207=20
6774728 | Mob +44 7921 777992<o:p></o:p></SPAN></P></FONT></DIV>
<DIV>&nbsp;</DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> =
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of </B>len 
=

boyle<BR><B>Sent:</B> 08 November 2005 14:17<BR><B>To:</B> Richard =
Hellier;=20
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> Re: [Veritas-bu] =
Some=20
drives running slower than others ? Anyone seen this,=20
please?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=3DArial size=3D2>We have seen this when the tape=20
drive&nbsp;&nbsp;and/or tape cart are failing. Do you see the cleaning =
light on=20
the tape drive. With the dlt7000 the cleaning light came on when the =
drive had=20
an ioerror. Cleaning may or may not&nbsp;clear up the problem. I believe =
that=20
most of the time cleaning does not clear up the problem. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The ce can check the error logs in the =
drive and=20
let you know if multiple tapes are having the same problem.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>len</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Drichard_hellier AT hotmail DOT com=20
  href=3D"mailto:richard_hellier AT hotmail DOT com">Richard Hellier</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
  title=3Dveritas-bu AT mailman.eng.auburn DOT edu=20
  =
href=3D"mailto:veritas-bu AT mailman.eng.auburn DOT edu">veritas-bu AT mailman 
DOT eng.=
auburn.edu</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, November 08, =
2005 4:44=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Veritas-bu] Some =
drives running=20
  slower than others ? Anyone seen this, please?</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier New'">We =
have an ATL=20
  P3000 library with 5 DLT drives. &nbsp;Just recently, backups that =
happen to=20
  land on two particular drives among the five seem to run much more =
slowly than=20
  expected. Anyone else seen anything like this, please, and can suggest =
a=20
  remedy?<o:p></o:p></SPAN></FONT></P>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'">Thanks!<o:p></o:p></SPAN></FONT></P>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'">Richard.<o:p></o:p></SPAN></FONT></P>
  <P style=3D"MARGIN-LEFT: 32.25pt"><FONT face=3D"Courier New" =
color=3Dnavy=20
  size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P><FONT face=3D"Courier New" color=3Dnavy size=3D1><SPAN=20
  style=3D"FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: 'Courier =
New'"><o:p>&nbsp;</o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></DIV>
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[Veritas-bu] Some drives running slower than others ? Anyone seen this, please?
