SUMMARY: growing a ufs drive

From: Jeff Kennedy <>
Date: Fri Jun 21 2002 - 17:15:10 EDT
Yes you can grow a ufs; and it is *not* required to have SDS in order to
do this.  SDS merely includes a script (growfs) that uses an
undocumented flag for mkfs (-G).

You can do the following on a Solaris system without SDS:

/usr/lib/fs/ufs/mkfs -G -M /current/mount /dev/rdsk/cXtYdZsA newsize

There were many people that responded to this and each fell into one of
2 camps; (1) you need SDS to do this and (2) you do not need SDS to do
this.  Surprisingly, even some people from SUN thought you needed SDS to
grow a ufs.  Now, the main issue with growing ufs is contiguous disk
space (which I assume is greatly alleviated with SDS, hence why it's
seen as a requirement).  The second biggy is that new inodes are not
allocated so this better be on a filesystem with fewer, larger files as
opposed to alot of little files.

Also, as I understand it, you cannot do this on a system partition.

Here are some links that were sent to me as well.

Many thanks to all who replied.


-------- Original Message --------
Subject: growing a ufs drive
Date: Tue, 18 Jun 2002 11:59:05 -0700
From: "Jeff Kennedy" <>
To: Sun-Managers List <>

I have heard that ufs has been able to be grown for some time now (from
2.6 up) with "growfs".  I cannot find this command nor can I confirm the
ability to do this.
Can anyone confirm yes or no that ufs can be grown?
sunmanagers mailing list
Received on Fri Jun 21 17:25:03 2002

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