Organization in a big file system Post: 100422

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Operating Systems AIX Organization in a big file system Post 100422 by Perderabo on Monday 27th of February 2006 12:07:40 PM

02-27-2006

Administrator Emeritus

If you create a large filesystem and then load it with data, the data will be distributed more of less evenly across the entire filesystem. If you extend a filesystem, the free space is mostly at the end of the disk. Either one could be better than the other under various circumstances. Suppose you never add any data...the heads never will need to move to the last 25% (or so) of the disk. Suppose a file near the beginning of the disk grows... it will probably be extended into cylinder groups at the end of the disk. Now the heads must move from one end of the disk to the other end of the disk just to read that file. Because this is Oracle, you need an Oracle expert to comment on this.

But even if you simply extend the filesystem.... (Or even if you leave it at the same size!) you absolutely need a backup! What if you try to extend it and the process fails? If the size of this filesystem is so large that you are having trouble making backups, maybe you should not extend it. Maybe it is time for a new filestem instead. And talk to your DBA. You probably need to use some kind of Oracle backup. You cannot just backup the dbf files of a live database.

Perderabo

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idevicebackup2

idevicebackup2(1)					      General Commands Manual						 idevicebackup2(1)

NAME

       idevicebackup2 - Create or restore backups for devices running iOS 4 or later.

SYNOPSIS

       idevicebackup2 [OPTIONS] CMD [CMDOPTIONS] DIRECTORY

DESCRIPTION

       Create or restore backup from the current or specified directory.

OPTIONS

       -u, --udid UDID
	      target specific device by its 40-digit device UDID.

       -s, --source UDID
	      use backup data from device specified by UDID.

       -i, --interactive
	      request passwords interactively on the command line.

       -d, --debug
	      enable communication debugging.

       -h, --help
	      prints usage information.

COMMANDS

       backup create backup for the device.

       restore
	      restore last backup to the device.

	    --system
	      restore system files, too.

	    --reboot
	      reboot the system when done.

	    --copy
	      create a copy of backup folder before restoring.

	    --settings
	      restore device settings from the backup.

	    --remove
	      remove items which are not being restored.

	    --password PWD
	      supply the password of the source backup.

       info   show details about last completed backup of device.

       list   list files of last completed backup in CSV format.

       encryption on|off [PWD]
	      enable or disable backup encryption.

       changepw [OLD NEW]
	      change backup password on target device.

AUTHORS

       Martin Szulecki

       Nikias Bassen

SEE ALSO

       idevicebackup(1)

																 idevicebackup2(1)