SUMMARY: Limiting the number of Superblock duplicates on newfs of huge filesystem

From: Chris Ruhnke (ruhnke@us.ibm.com)
Date: Thu Sep 15 2005 - 08:09:13 EDT


Thanks for responding to: Jeff Woolsey, Dave Mitchell, David Markowitz,
and Dan Stromburg.

Comments centered on reducing the number of cylinder groups using the -c
option and the number of inodes using -i option. Unfortunately, newfs had
already minmax'ed these options and I had nowhere to go.

Other suggestions were to examine the "new" filesystems from Sun - QFS and
ZFS.

I will live with it the way it is...

> I don't have to newfs filesystems very often so I don't run into this
> problem that much.
>
> I have just built a 500+ GByte RAID-5 user data filesystem. I am
running
> "newfs" against it and it has been running for almost an hour now.
Because
> of the amount of data space available, newfs is creating a gazillion
> superblock duplicates. Now, I am quite happy to have superblock
> duplicates in the event of loss of the primary superblock. But this is
a
> failure that rarely happens any more. Usually the entire filesystem
gets
> corrupted beyond redemption. I don't mind giving up some space to a few

> -- even a few hundred -- superblock clones. But there comes a point
when
> duplicate superblocks are just a waste of space and fragementation of
the
> data area.
>
> Does anyone have any suggestions about how to limit the number of
> superblock duplicates that get created on a ufs filesystem. I am
> restricted by the customer to using UFS and do not have the luxury of
> looking into Veritas or any other "smart" volume/filesystem manager. I
> haven't found anything promising in the man pages.

--CHRis

Chris H. Ruhnke
Technical Services Professional
IBM Global Services
Dallas, TX

Office: (972) 980-0474 ext. 234
Cell: (214) 704-3749
Text messaging: mail to 2147043749@mmode.com (128 character max)

O'Toole's Law: Murphy is an optimist.
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