topic Re: About Large File Support in Operating System - HP-UX

About Large File Support

Dhipu — Tue, 11 Nov 2008 11:46:41 GMT

I have one RX6600 with HPUX 11.23 without Online JFS(ie only with VXFS).I have created a partition using the command
#mkfs -F vxfs /dev/vg01/lvol4
but now I want to include the option called large file support in this partition(2GB support).Can I do it without destroying the filesystem in it.

Re: About Large File Support

likid0 — Tue, 11 Nov 2008 11:52:39 GMT

Yes, you can do it with out any problem:

fsadm -o largefiles /mountPOINT

Re: About Large File Support

Ivan Krastev — Tue, 11 Nov 2008 11:53:19 GMT

You can change it with:

#fsadm -F vxfs -o largefiles /mountpoint

regards,
ivan

Re: About Large File Support

Suraj K Sankari — Tue, 11 Nov 2008 11:54:51 GMT

Hi,

You can use mount command
mount -o largfiles /dev/vg01/lvol4 /mountpoint

Suraj

Re: About Large File Support

Dhipu — Tue, 11 Nov 2008 11:57:26 GMT

What you were mentioning is when we have Online JFS installed, in my case I have only VXFS support.

Is it true?

Re: About Large File Support

Ganesan R — Tue, 11 Nov 2008 12:26:55 GMT

Hi Dhipu,

Online JFS is need if you want to do it online. i.e on mounted filesystem.

But without online JFS also you can enable largefiles by using fsadm. but the filesystem should be unmounted.

See the quote from HP.

Changing from a Large-Files File System:

You can change a file system back and forth between large files and no large files using the fsadm command. It is important to realize that the conversion of these file systems must be done on an unmounted file system, and fsck will be called after a successful conversion.

The following example shows how to convert a no-large-files file system to a large-files file system.

/usr/sbin/fsadm -F hfs -o largefiles /dev/vg02/rlvol1

The mount Command and Large-Files File Systems:

The mount command supports large-files file systems and provides you with a method of ensuring that no large-files file systems are mounted on the system.

The mount command uses the same two options as the mkfs, newfs, and fsadm commands (largefiles and nolargefiles). mount will not mount a large-files file system if the -o nolargefiles option is specified. Conversely, the mount command will not mount a no-large-files file system if the -o largefiles option is specified. If no option is provided to mount, it will use the state of the file system itself to determine if it is mounted as largefiles or nolargefiles.

Re: About Large File Support

Sagar Sirdesai — Wed, 12 Nov 2008 07:46:42 GMT

Hi Dhipu

you will need Online JFS with a valid license to add the largefile option using fsadm command on a mounted filesystem.

Check if you can get a demo license for Online JFS from HP.

Sagar

Re: About Large File Support

Johnson Punniyalingam — Wed, 12 Nov 2008 08:21:56 GMT

# newfs -F vxfs -o largefiles /dev/vg01/rlvol4

mkdir /
cp -p /etc/fstab /etc/fstab.bk
vi /etc/fstab

/dev/vg01/lvol4 / vxfs rw,suid,largefiles,delaylog,datainlog 0 2

mount /

Thanks,
Johnson