2.6TB filesystem to be copied or moved to another FS ? Post: 302481702

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Operating Systems AIX 2.6TB filesystem to be copied or moved to another FS ? Post 302481702 by bakunin on Sunday 19th of December 2010 09:46:35 AM

12-19-2010

Registered User

Quote:

Originally Posted by filosophizer

1) What is the fastest way to copy or mirror it to another filesystem without shutting down production vg ( oracle is using the filesystem )

I suppose that the mirrorlv soution will be on of the fastest methods and probably the one with the least hassle. I would, being in your place, prefer to go for this solution.

In case this is not possible for whatever reason, here is a suggestion, you will have to fill in some blanks. It assumes that there is (almost) nothing else than the DB-files on the filesystem.

1. Set the database into "hot backup" mode. I don't know exactly how this is done, but every Oracle DBA knows for sure what I'm talking about. Basically this is making the database aware that a file-backup is taken while it is running. The file-backup as such will be considered inconsistent but along with the archive logs taken during the backup it can be made consistent. Oracle has special provisions for doing exactly this built in.

Note that the redo-logs created this way contain more info than normal redo-logs and the rate of logswitches will increase. Your DBA should be able to estimate how big the factor of the increase will be.

2. Take a file-backup from the running database. You can use whatever system means there are: TSM, tar, cp , ....

3. After the backup has finished rotate out the active redo-logs and set the database to normal again.

4. After restoring the copy to some other diskspace start the database and make it consistent by applying the archive-logs taken since the start of the backup-process. The DB then is consistent and equal to the original at the time of the end of the backup process.

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xfs_freeze

xfs_freeze(8)						      System Manager's Manual						     xfs_freeze(8)

NAME

       xfs_freeze - suspend access to an XFS filesystem

SYNOPSIS

       xfs_freeze -f | -u mount-point

DESCRIPTION

       xfs_freeze suspends and resumes access to an XFS filesystem (see xfs(5)).

       xfs_freeze  halts  new access to the filesystem and creates a stable image on disk.  xfs_freeze is intended to be used with volume managers
       and hardware RAID devices that support the creation of snapshots.

       The mount-point argument is the pathname of the directory where the filesystem is mounted.  The filesystem must be  mounted  to	be  frozen
       (see mount(8)).

       The  -f flag requests the specified XFS filesystem to be frozen from new modifications.	When this is selected, all ongoing transactions in
       the filesystem are allowed to complete, new write system calls are halted, other calls which modify the	filesystem  are  halted,  and  all
       dirty data, metadata, and log information are written to disk.  Any process attempting to write to the frozen filesystem will block waiting
       for the filesystem to be unfrozen.

       Note that even after freezing, the on-disk filesystem can contain information on files that are still in the process of	unlinking.   These
       files will not be unlinked until the filesystem is unfrozen or a clean mount of the snapshot is complete.

       The  -u	flag  is used to un-freeze the filesystem and allow operations to continue.  Any filesystem modifications that were blocked by the
       freeze are unblocked and allowed to complete.

       One of -f or -u must be supplied to xfs_freeze.

NOTES

       A copy of a frozen XFS filesystem will usually have the same universally unique identifier (UUID) as the original, and  thus  may  be  pre-
       vented from being mounted.  The XFS nouuid mount option can be used to circumvent this issue.

       In  Linux  kernel version 2.6.29, the interface which XFS uses to freeze and unfreeze was elevated to the VFS, so that this tool can now be
       used on many other Linux filesystems.

SEE ALSO

       xfs(5), lvm(8), mount(8).

																     xfs_freeze(8)