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тАО07-12-2002 04:25 AM
тАО07-12-2002 04:25 AM
EMC Split Mirror and VxFS
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тАО07-12-2002 04:29 AM
тАО07-12-2002 04:29 AM
Re: EMC Split Mirror and VxFS
When you say "BLOCK" your database, do you mean you are putting it into HOT-BACKUP mode, stopping the database, or just preventing the users from using it by stopping the applications?
live free or die
harry
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тАО07-12-2002 04:34 AM
тАО07-12-2002 04:34 AM
Re: EMC Split Mirror and VxFS
We use Informix so we put a block on the instance which allows users to read the database but writes are paused while the split is occuring. In addition a checkpoint is executed. This allows for a clean recovery point.
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тАО07-12-2002 10:59 AM
тАО07-12-2002 10:59 AM
Re: EMC Split Mirror and VxFS
I wonder if the split is occuring before the host had a chance to flush all of its buffers.
Do a sync before splitting.
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тАО07-12-2002 01:01 PM
тАО07-12-2002 01:01 PM
Re: EMC Split Mirror and VxFS
We do the following:
block on DB
Unix "sync" command on DB server
split
unblock
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тАО07-12-2002 01:11 PM
тАО07-12-2002 01:11 PM
Re: EMC Split Mirror and VxFS
Before we do a split we put the databse in backup mode on the orginal server so that there are no activities which take place for updation of data , and the split is clean , this also cut some archive logs whichare copied back after the fielsystems come up . The standard practice is to do a vgchgid , vgimport and then do a fsck on the mount points , incas eoyu need the scripts which we use I can share them too.
Manoj Srivastava
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тАО07-12-2002 02:35 PM
тАО07-12-2002 02:35 PM
Re: EMC Split Mirror and VxFS
I assume that you are using raw logical volumes for Informix and not not cooked files. You could try putting Informix into quiescent mode, issue the symmir command to split the device group and then bring Informix up into online mode.
If you were using Oracle, this is not a problem as all you need to do is put the database in to backup mode before issuing the split command.
Cheers,
Joseph.
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тАО07-15-2002 12:03 AM
тАО07-15-2002 12:03 AM
Re: EMC Split Mirror and VxFS
Apart from unmounting the filesystem, are there any VxFS commands/utilities I can use to prevent file loss by fsck after the split?
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тАО07-15-2002 11:01 AM
тАО07-15-2002 11:01 AM
Re: EMC Split Mirror and VxFS
Can you verify for us that you are using a "sync" command before you execute the BCV split? In my experience, this is key to avoiding file loss/big fsck problems.
M????a
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тАО07-15-2002 12:53 PM
тАО07-15-2002 12:53 PM
Re: EMC Split Mirror and VxFS
HTH
Marty