03-10-2009
Another thought: You said, that you use an inter policy of maximum spreading the LV over 185 LUNs thus. Try to change the policy back to minumum and then try to reduce size again. This is worth a try as the inter policy seems to influence allocp considerably.
(Depending on your SAN you might not need to use an inter policy of maximum if you spread your LUNs evenly over many disks already.E.g. if you spread a number of LUNs over the same rank/shelve/whatever the LV on those LUNs utilise all physical disks already. Hence no need to add another layer of complexity for data distribution. It might even be that I/O speeds up if you spare LVM from doing this extra work.)
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LEARN ABOUT NETBSD
resize_lfs
RESIZE_LFS(8) BSD System Manager's Manual RESIZE_LFS(8)
NAME
resize_lfs -- resize a mounted log-structured filesystem
SYNOPSIS
resize_lfs [-v] [-s new-size] mounted-file-system
DESCRIPTION
resize_lfs grows or shrinks a mounted log-structured filesystem to the specified size. mounted-file-system is the name of the filesystem to
be resized, and new-size is the desired new filesystem size, in sectors. If new-size is not specified, resize_lfs will default to the cur-
rent size of the partition containing the filesystem in question.
When growing, the partition must be large enough to contain a filesystem of the specified size; when shrinking, resize_lfs must first
``clean'' the segments that will be invalid when the filesystem is shrunk. If this cleaning process results in these segments becoming
redirtied, this indicates that the given new size is not large enough to contain the existing filesystem data, and resize_lfs will return an
error.
EXAMPLES
To resize the file system mounted at /home to 32576 sectors:
resize_lfs -s 32576 /home
SEE ALSO
fsck_lfs(8), lfs_cleanerd(8), newfs_lfs(8)
HISTORY
The resize_lfs command first appeared in NetBSD 3.0.
AUTHORS
Konrad Schroder <perseant@NetBSD.org>
BUGS
resize_lfs should be able to resize an unmounted filesystem as well.
BSD
September 4, 2006 BSD