[Veritas-bu] LTO drive won't run at full speed

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The reboot fixed the problem.
 
Thanks all!
 
 
-----Original Message-----
From: Karl.Rossing AT Federated DOT CA [mailto:Karl.Rossing AT Federated DOT 
CA] 
Sent: August 14, 2003 5:43 PM
Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: Re: [Veritas-bu] LTO drive won't run at full speed





veritas-bu-admin AT mailman.eng.auburn DOT edu wrote on 08/14/2003 04:19:53 PM:

> I believe this has been mentioned here before, and I've experienced this 
> myself.  The LTO drives on our backup system are SCSI connected.  On at 
> least two occasions, the scsi bus has experienced some kind of  
> disruption to cause it to slow down to SE speeds.  When I could normally 
> get 20+ MB/sec, the affected drive would not write at speeds above 5 
> MB/sec.  Rebooting the server fixed the problem.  If this happens 
> frequently, then it's likely a hardware fault.  I was able to confirm 
> the slowdown by checking the system logs or dmesg.  It would clearly 
> show the scsi bus error, the devices affected, and would give the exact 
> speed or mode that the card was now operating.
> 
> -Jon

Same thing happend with our exabyte mammoth drives. 

Reboot fixed the problem. 

Karl


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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=483083315-15082003>The 
reboot fixed the problem.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN 
class=483083315-15082003></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN 
class=483083315-15082003>Thanks 
all!</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN 
class=483083315-15082003></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN 
class=483083315-15082003></SPAN></FONT>&nbsp;</DIV>
<DIV></DIV>
<DIV><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> 
Karl.Rossing AT Federated DOT CA [mailto:Karl.Rossing AT Federated DOT CA] 
<BR><B>Sent:</B> 
August 14, 2003 5:43 PM<BR><B>Cc:</B> 
'veritas-bu AT mailman.eng.auburn DOT edu'<BR><B>Subject:</B> Re: [Veritas-bu] 
LTO 
drive won't run at full speed<BR><BR></DIV></FONT>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px"><BR><BR><FONT 
  size=2><TT>veritas-bu-admin AT mailman.eng.auburn DOT edu wrote on 08/14/2003 
  04:19:53 PM:<BR><BR>&gt; I believe this has been mentioned here before, and 
  I've experienced this <BR>&gt; myself. &nbsp;The LTO drives on our backup 
  system are SCSI connected. &nbsp;On at <BR>&gt; least two occasions, the scsi 
  bus has experienced some kind of &nbsp;<BR>&gt; disruption to cause it to 
slow 
  down to SE speeds. &nbsp;When I could normally <BR>&gt; get 20+ MB/sec, the 
  affected drive would not write at speeds above 5 <BR>&gt; MB/sec. 
  &nbsp;Rebooting the server fixed the problem. &nbsp;If this happens <BR>&gt; 
  frequently, then it's likely a hardware fault. &nbsp;I was able to confirm 
  <BR>&gt; the slowdown by checking the system logs or dmesg. &nbsp;It would 
  clearly <BR>&gt; show the scsi bus error, the devices affected, and would 
give 
  the exact <BR>&gt; speed or mode that the card was now operating.<BR>&gt; 
  <BR>&gt; -Jon<BR></TT></FONT><BR><FONT size=2><TT>Same thing happend with our 
  exabyte mammoth drives.</TT></FONT> <BR><BR><FONT size=2><TT>Reboot fixed the 
  problem.</TT></FONT> <BR><BR><FONT 
size=2><TT>Karl</TT></FONT></BLOCKQUOTE></BODY></HTML>

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