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In general, I've heard nothing bad about tape alert cleaning. The mistake,
usually, is library-based cleaning. If you use library-based cleaning, then
the library, without any alert to Netbackup, can chose to clean a tape
drive, usually using a pseudo-hidden cleaning tape from a reserved slot. If
the library cleans the tape drive & Netbackup doesn't know about it, then NB
can try to use the drive when a cleaning is occurring. The tape mount will
fail & NB will down the drive.
For an SSO environment, your only NB-based option is tape alert cleaning.
Frequency-based (at least in v5.x & down) doesn't work in SSO because the
media servers make no attempt to coordinate hours of run time for each
drive.
-M
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Justin
Piszcz
Sent: Thursday, February 02, 2006 11:45 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] No response concerning tape alert?
Anyone have any response to this e-mail concerning the tape alert flag?
Hi,
I have recently moved to new environment, which actively uses the tape alert
setting in Veritas and has cleaning tapes assigned etc.
The drives used are HP-Ultrium2-LTO2, the same in the previous environment,
which I was responsible for.
As I recall in the NetBackup with LTO2 drives I read somewhere or a previous
thread on this mailing list, it is not recommended to turn this feature on
as it causes more probolems than it fixes? Can using the TapeAlert settings
cause more drives to go down than normal?
I am trying to figure that part out as my previous main environment had 8
LTO2 drives which did not use tapealert.
The new environment has many more drives but they all use tape alert, does
anyone have any experience in large or small environments using tape alert?
I've always seen and followed the standard placing the NO_TAPE_ALERT file in
/usr/openv/volmgr/somewhere as it had never run in the past in the previous
environment so I saw no reason to run it. I realize the drives will get
dirty after a certain amount of use and need to be cleaned. However, I have
spoken with StorageTek in the past and they do not recommend cleaning the
drives very often; although I guess that would depend on the use the drives
see as well.
Ultimately, I'd like to know:
1) Who uses tape alert?
2) Have you tried backups for an extended period of time with it on and off?
3) Does it create more problems than it fixes?
Thanks,
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<DIV><SPAN class=662162120-02022006><FONT face=Arial color=#0000ff size=2>In
general, I've heard nothing bad about tape alert cleaning. The mistake,
usually, is library-based cleaning. If you use library-based cleaning,
then the library, without any alert to Netbackup, can chose to clean a tape
drive, usually using a pseudo-hidden cleaning tape from a reserved slot.
If the library cleans the tape drive & Netbackup doesn't know about it,
then
NB can try to use the drive when a cleaning is occurring. The tape mount
will fail & NB will down the drive.</FONT></SPAN></DIV>
<DIV><SPAN class=662162120-02022006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=662162120-02022006><FONT face=Arial color=#0000ff size=2>For
an
SSO environment, your only NB-based option is tape alert cleaning.
Frequency-based (at least in v5.x & down) doesn't work in SSO because the
media servers make no attempt to coordinate hours of run time for each
drive.</FONT></SPAN></DIV>
<DIV><SPAN class=662162120-02022006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=662162120-02022006><FONT face=Arial color=#0000ff
size=2>-M</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]<B>On Behalf Of
</B>Justin
Piszcz<BR><B>Sent:</B> Thursday, February 02, 2006 11:45 AM<BR><B>To:</B>
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> [Veritas-bu] No
response
concerning tape alert?<BR><BR></FONT></DIV>
<DIV>Anyone have any response to this e-mail concerning the tape alert
flag?</DIV>
<DIV> </DIV>
<DIV>Hi,</DIV>
<DIV> </DIV>
<DIV>I have recently moved to new environment, which actively uses the tape
alert setting in Veritas and has cleaning tapes assigned etc.</DIV>
<DIV>The drives used are HP-Ultrium2-LTO2, the same in the previous
environment, which I was responsible for.</DIV>
<DIV> </DIV>
<DIV>As I recall in the NetBackup with LTO2 drives I read somewhere or a
previous thread on this mailing list, it is not recommended to turn this
feature on as it causes more probolems than it fixes? Can using the
TapeAlert settings cause more drives to go down than normal? </DIV>
<DIV> </DIV>
<DIV>I am trying to figure that part out as my previous main environment had
8
LTO2 drives which did not use tapealert.</DIV>
<DIV> </DIV>
<DIV>The new environment has many more drives but they all use tape alert,
does anyone have any experience in large or small environments using tape
alert? I've always seen and followed the standard placing the
NO_TAPE_ALERT file in /usr/openv/volmgr/somewhere as it had never run in the
past in the previous environment so I saw no reason to run it. I
realize
the drives will get dirty after a certain amount of use and need to be
cleaned. However, I have spoken with StorageTek in the past and they do
not recommend cleaning the drives very often; although I guess that would
depend on the use the drives see as well. </DIV>
<DIV> </DIV>
<DIV>Ultimately, I'd like to know:</DIV>
<DIV> </DIV>
<DIV>1) Who uses tape alert?</DIV>
<DIV>2) Have you tried backups for an extended period of time with it on and
off?</DIV>
<DIV>3) Does it create more problems than it fixes?</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV></BLOCKQUOTE></BODY></HTML>
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