Decreasing The Size Of A Software Raid; Decreasing The Size Of The File System - Novell LINUX ENTERPRISE SERVER 10 SP3 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

ReiserFS
As with Ext2 and Ext3, a ReiserFS file system can be increased in size while mounted or
unmounted. The resize is done on the block device of your RAID array.
1 Open a terminal console, then log in as the
2 Increase the size of the file system on the software RAID device called
the following methods:
To extend the file system size to the maximum available size of the device, enter
resize_reiserfs /dev/md0
When no size is specified, this grows the volume to the full size of the partition.
To extend the file system to a specific size, enter
resize_reiserfs -s size /dev/md0
Replace size with the desired size in bytes. You can also specify units on the value, such as
50000K (kilobytes), 250M (megabytes), or 2G (gigabytes). Alternatively, you can specify
an increase to the current size by prefixing the value with a plus (+) sign. For example, the
following command increases the size of the file system on
resize_reiserfs -s +500M /dev/md0
Wait until the resizing is completed before continuing.
3 If the file system is not mounted, mount it now.
For example, to mount an ReiserFS file system for a RAID named
, enter
raid
mount -t reiserfs /dev/md0 /raid
4 Check the effect of the resize on the mounted file system by entering
df -h
The Disk Free (
the number of blocks available on the file system. The -h option print sizes in human-readable
format, such as 1K, 234M, or 2G.

8.3 Decreasing the Size of a Software RAID

Before you begin, review the guidelines in
page 109.
Section 8.3.1, "Decreasing the Size of the File System," on page 114
Section 8.3.2, "Decreasing the Size of Component Partitions," on page 116
Section 8.3.3, "Decreasing the Size of the RAID Array," on page 117

8.3.1 Decreasing the Size of the File System

When decreasing the size of the file system on a RAID device, make sure the new size satisfies the
following conditions:
The new size must be greater than the size of the existing data; otherwise, data loss occurs.
The new size must be equal to or less than the current RAID size because the file system size
cannot extend beyond the space available.
114 SLES 10 SP3: Storage Administration Guide
) command shows the total size of the disk, the number of blocks used, and
df
Section 8.1, "Understanding the Resizing Process," on
user or equivalent.
root
/dev/md0
/dev/md0
, using one of
/dev/md0
by 500 MB:
at mount point
/