How to extend the size of an LVM volume RHEL5?

[Dave Martini <martini1@xxxxxxxx>]

Trying to extend the size of a mirrored lvm volume but get this error

# lvextend -L+3G /dev/appsdata/apps1
 Extending 2 mirror images.
 Mirrors cannot be resized while active yet.

I tried unmounting the file system but get the same error.
Anyone know how to do this?
Thanks.
Dave Martini

# lvdisplay
 --- Logical volume ---
 LV Name                /dev/appsdata/apps1
 VG Name                appsdata
 LV UUID                ViPcM1-x20X-fzBG-Og7c-pzvP-ddJa-DLB0lL
 LV Write Access        read/write
 LV Status              available
 # open                 1
 LV Size                21.49 GB
 Current LE             5502
 Segments               1
 Allocation             inherit
 Read ahead sectors     0
 Block device           253:3

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