RE: Mirroring REDO logs to an nfs drive

From: <Jared.Still_at_radisys.com>
Date: Fri, 25 Jan 2002 11:43:07 -0800
Message-ID: <F001.003FBA1F.20020125113833@fatcity.com>

If the SA's would soft-mount the drives instead of hard-mounting them, they wouldn't have to reboot.

Jared

"Browett, Darren" <dbrowett_at_city.coquitlam.bc.ca> Sent by: root_at_fatcity.com
01/25/02 10:31 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: Mirroring REDO logs to an nfs drive

I have experienced problems in the past when using NFS drives to dump large amounts of data. No sure if having the redo logs there will cause the
same problem.

I am running a tru64 4.0f environment, and what I was doing ( needed the disk
space at the time) was export my production databases to a NFS mounted drive.

>From what I understand, due to the amount of data being dumped to the NFS drive,
I basically over-saturated the connection, which caused the "automount" daemon on
my other systems to drop the NFS drive periodically and without warning.

To fix the problem was to simply stop the export processes going to the NFS
drives (which were running
every 2nd night) and reboot the NFS master.

Darren

-----Original Message-----
Sent: January 24, 2002 11:49 AM
To: Multiple recipients of list ORACLE-L

Our site is preparing to fail over to our backup server. We need to do maintenance on our production server, and will be running on the backup for
about 24 hours. One issue I brought up was that our backup server is not equiped with mirrored drives, thus there was the possibility that a drive failure could destroy an online redo log. On our production box the logs are not software mirrored, because of the physical mirroring in our drive cabinet.

As a result I was told to multiplex the redo logs once we had failed over to
the backup server. Furthermore I would add the new members to an nfs drive,
so that even a pesky controller couldn't foil our mirrored log files.

I have some questions about this. First, am I just looking for problems by
doing this? I would appreciate any tips or warnings on this subject. Secondly, researching this topic made me curious as to my DB's settings for
MAXLOGFILES and MAXLOGMEMBERS. Where can I find these parameters? I was sure I would find them in v$parameter, but they were not there.

Thanks for any response,
Steve McClure

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Author: Steve McClure
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Author: Browett, Darren
INET: dbrowett_at_city.coquitlam.bc.ca

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Author:
INET: Jared.Still_at_radisys.com

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