05-08-2014
Its just more to this than file system size reduction.
You have around 1.1TB of storage, you have emc MPIO. Now,
1. How are the disks configured? NPIV or vscsi or direct fibre (Have you configured the fscsiX setting?)
2. Disk allocation is absolutely wrong, 500 GB disk will definitely degrade the performance.
3. Did you configure the disks queue depth values?
4. What version of OS are you using?
5. What version of oracle are you using?
If the version of Oracle and OS require you to enable CIO, was it done.
Frankly %tm_act is way beyond, generally it should be within 30
You want to reduce the size of disks and evenly strip the LV across them.
These are few of the many question to ask.
Also, can you paste the %utilization of each File system (using df -g),
Is this a production system?
There is other way, by bringing down (and if required umount and remount the FS) the DB and try to reduce the FS (which I don't do/recommend in realtime)
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LEARN ABOUT REDHAT
lvmdiskscan
LVMDISKSCAN(8) System Manager's Manual LVMDISKSCAN(8)
NAME
lvmdiskscan - scan for all disks / multiple devices / partitions available
SYNOPSIS
lvmdiskscan [-d|--debug] [-h|--help] [-l|--lvmpartitions] [-v|--verbose]
DESCRIPTION
To give an overview about online peripherals usable to LVM, lvmdiskscan scans all SCSI, (E)IDE disks, multiple, loop and network block
devices in the system and lists them on standard output with name, size and type (text/hex). The size is the real device size, not the size
stored in the VGDA (See pvcreate(8) ) for details.
OPTIONS
-d/--debug
Enables additional debugging output (if compiled with DEBUG).
-h, --help
Print a usage message on standard output and exit successfully.
-l, --lvmpartition
Gives an overview about all LVM system identified partitions only.
-v, --verbose
Gives verbose runtime information about lvmdiskscan's activities.
DIAGNOSTICS
lvmdiskscan returns an exit code of 0, if disks / multiple devices / partitions where found and > 0 for error:
1 no special files found
2 no disks / multiple devices / disk partitions found
95 driver/module not in kernel
96 invalid I/O protocol version
97 error locking logical volume manager
98 invalid lvmtab (run vgscan(8))
99 invalid command line
See also
lvm(8), pvcreate(8), pvdisplay(8), pvscan(8)
AUTHOR
Heinz Mauelshagen <Linux-LVM@Sistina.com>
Heinz Mauelshagen LVM TOOLS LVMDISKSCAN(8)