Veritas-bu

[Veritas-bu] disaster recovery techniques

2004-06-23 20:00:12
Subject: [Veritas-bu] disaster recovery techniques
From: Nick.Lefebvre AT datacom.com DOT au (Nick Lefebvre)
Date: Thu, 24 Jun 2004 10:00:12 +1000
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Hi all,
 
We are using Veritas Netbackup Datacentre 3.4.
 
We just had a situation where one of our engineers tried to recover the root
slice of a Solaris client machine.
 
The client's root file system was intact but in a moment of panic the
engineer tried to roll back to the previous night's full backup and restore
the entire root file system on the client.
 
The restore was initiated from our master server and directed to the
original location on the Solaris client, that being everything under / was
to be restored to its original question. 
 
The client only had one system disk as it was a staging server.
 
The restore failed when Netbackup tried to restore a library file
libc_psr.so.1, and from then on Netbackup kept repeating messages failed to
restore fie.
 
My feeling is that Netbackup tried to overwrite a system file that was being
used by the operating system and put the system into a spin.
 
I have read the troubleshooting guide and the only way that is mentioned to
recover a root file system is to rebuild the o/s on an alternate disk, boot
off this alternate disk, recover Netbackup databases on the alternate disk,
and then restore files to the original disk.
 
This recovery system makes sense.
 
My question is, is there a way of recovering a root file system without
causing complications if you only have one disk available and you cannot
build an operating system on an alternate disk??
 
Is this a supported method??
 
Should we be looking at system images in this instance?
 
We are not using Veritas Bare Metal Restore.

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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hi all,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>We are using <span class=3DSpellE>Veritas</span> =
<span
class=3DSpellE>Netbackup</span> <span class=3DSpellE>Datacentre</span> =
3.4.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>We just had a situation where one of our engineers =
tried to
recover the root slice of a Solaris client =
machine.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The client's root file system was intact but in a
moment of panic the engineer tried to roll back to the previous night's
full backup and restore the entire root file system on the client.<o:p><=
/o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The restore was initiated from our master server and
directed to the original location on the Solaris client, that being =
everything
under / was to be restored to its original question. =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The client only had one system disk as it was a =
staging
server.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The restore failed when <span =
class=3DSpellE>Netbackup</span>
tried to restore a library file libc_psr.so.1, and from then on <span
class=3DSpellE>Netbackup</span> kept repeating messages failed to =
restore fie.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>My feeling is that <span =
class=3DSpellE>Netbackup</span> tried
to overwrite a system file that was being used by the operating system =
and put
the system into a spin.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have read the troubleshooting guide and the only =
way that
is mentioned to recover a root file system is to rebuild the o/s on an
alternate disk, boot off this alternate disk, recover <span =
class=3DSpellE>Netbackup</span>
databases on the alternate disk, and then restore files to the original =
disk.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>This recovery system makes =
sense.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>My question is, is there a way of recovering a root =
file
system without causing complications if you only have one disk =
available and
you cannot build an operating system on an alternate =
disk??<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Is this a supported =
method??<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Should we be looking at system images in this =
instance?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>We are not using <span class=3DSpellE>Veritas</span> =
Bare
Metal Restore.<o:p></o:p></span></font></p>

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