Re: crash during backup

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• In reply to: Bill SG: "Re: crash during backup"
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Date: Thu, 21 Oct 2004 13:52:29 -0500

True that when the log files are purged it does not restart with log #1. Not
true that the data from the logs are getting put into the database during
backup. Transactions are written to the log files and to memory
simultaneously. To the log files in case for the need of recovery. It is
written from memory to the database. So in case of a power failure
transactions that are in memory are lost right? Well on a restart
logging/recovery happens and the transactions from the logs are read to
bring the database to a startable state with the missing transactions that
were not applied from memory.

-- 
Tyrone Cowart
Microsoft
"Please do not send email directly to this alias. This alias is for
newsgroup purposes only."
"This posting is provided "AS IS" with no warranties, and confers no
 rights."
"Bill SG" <don't want any spam> wrote in message
news:ezddkhytEHA.2980@tk2msftngp13.phx.gbl...
> I don't know if this post will show up, since I am answering an old one.
If
> not, I'll repost it later.
>
> I had been running the backup onto the C: drive of the exchange server.
The
> C: is also where priv1.edb and the log files are located. The backup would
> crash the entire computer every time the backup file reach the approximate
> size of the priv1.edb file.
>
> Yesterday I got the idea to back up to another computer. The first time it
> worked flawlessly. The backup finished without error. The log files were
> removed. The priv1.edb did not increase in size, confirming that the data
in
> the logs was being put into it all along.
>
> One thing that might be normal or might be odd. Today the new log files
that
> were created did not start over again at number 1. They are continuing
from
> the highest number that was there before the backup.
>
>
> "Tyrone Cowart [MSFT]" <tyronec@online.microsoft.com> wrote in message
> news:e4cGpCVsEHA.224@TK2MSFTNGP15.phx.gbl...
> > If you dismount the stores or shutdown the Information Store in a
graceful
> > state then the transactions in memory should get committed to the
> database.
> > To check this run eseutil /mh <path to the database> |more. Look for the
> > state of the database. If the database shows to be in a "Clean Shutdown"
> > state then you can safely delete the log files.
> >
> > Circular logging is an option if you are concerned with disk space,
> however,
> > this will limit your recovery options. With circular logging enabled you
> can
> > only restore your last full backup and that is it. This means that if
you
> > crash on Friday and your last full backup was on Tuesday you would only
> > recover up until Tuesday. with circular logging disabled you can restore
> > from Tuesday's tape and replay the log files to the point of failure.
> >
> > Unfortunately the only way that I know to validate your backups is to
> > restore it. If you have a recovery server and can test this then that
> would
> > be great.
> >
> >
> > -- 
> > Tyrone Cowart
> > Microsoft
> >
> > "Please do not send email directly to this alias. This alias is for
> > newsgroup purposes only."
> > "This posting is provided "AS IS" with no warranties, and confers no
> >  rights."
> > "Bill SG" <don't want any spam> wrote in message
> > news:Or76MQNsEHA.3200@TK2MSFTNGP09.phx.gbl...
> > > I see. The info in the log files is already in the main database. Is
> there
> > a
> > > safe way to remove the log files besides backing up? There are taking
up
> > > 1.5GB now. I do have plenty of space for now (50GB), but would rather
> have
> > > backups as backups rather than as log files.
> > >
> > > How about using circular logging? Would that help me? Is it safe to
> switch
> > > it on now? Is it safe to switch back and forth?
> > >
> > > Is there a way to tell if the backups I've made are complete and
> > uncorrupt?
> > >
> > > Thanks,
> > >
> > > Bill
> > >
> > >
> > >
> > > "Tyrone Cowart [MSFT]" <tyronec@online.microsoft.com> wrote in message
> > > news:e0AFq7KsEHA.1032@TK2MSFTNGP10.phx.gbl...
> > > > If this is happening then there is something going on at the kernel
> > level.
> > > > It is difficult for a user mode application to bring the kernel
down,
> > but
> > > if
> > > > you have no mouse and you can not bring up task manager then this is
> > what
> > > is
> > > > happening. It may be necessary to take a user dump at the time to
see
> > what
> > > > is actually happening.
> > > > You may also want to verify that there is enough free disk space if
> you
> > > are
> > > > backing up to a file on the disk.
> > > >
> > > > It is correct that the log files are for recovery purposes only. The
> > > backup
> > > > is not trying to commit these transactions to the database, but
during
> a
> > > > full or incremental the backup does purge the log files.
> > > >
> > > >
> > > >
> > > > -- 
> > > > Tyrone Cowart
> > > > Microsoft
> > > >
> > > > "Please do not send email directly to this alias. This alias is for
> > > > newsgroup purposes only."
> > > > "This posting is provided "AS IS" with no warranties, and confers no
> > > >  rights."
> > > > "Bill SG" <don't want any spam> wrote in message
> > > > news:#FNRW#DsEHA.1232@TK2MSFTNGP11.phx.gbl...
> > > > > Hi,
> > > > >
> > > > > I recently created a new Exchange 2000 server setup. I then copied
a
> > lot
> > > > of
> > > > > old data into users' mailboxes. I now have about 300 of those 5 MB
> log
> > > > > files. I know that backing up will put them into the database
where
> > they
> > > > > belong. Problem is, when I use MS backup to do the backup, the
> entire
> > > > > computer crashes. The mouse won't move and CTRL-ALT-DEL won't
work -
> I
> > > > have
> > > > > to reset. The crash occurs after about 3 GB of data is backed up,
> > which
> > > is
> > > > > the size of priv1.edb. So I guess the crash occurs when it is time
> to
> > > > start
> > > > > posting the log files to the database.
> > > > >
> > > > > Is there any way I can solve this?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Bill
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>

• Previous message: Bd26376: "Re: Mailbox Store (SERVER)" cannot be read"
• In reply to: Bill SG: "Re: crash during backup"
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