topic Re: Kernel parameter in Operating System - HP-UX

Kernel parameter

Nagaraju Gudala — Wed, 18 Jun 2003 11:13:48 GMT

I want to know what are the tunable parameters and their value in HP11 for opening files of large size,to ftp files of size upto 3GB .Is it possible to ftp files of such large size.

Re: Kernel parameter

Stefan Farrelly — Wed, 18 Jun 2003 11:19:57 GMT

Yes, it is possible to ftp files of 3Gb or more, no problems. I dont believe you need to adjust any kernel parameter for this to work.

All you need to ensure is the filesystem you are ftp'ing to has largefiles set so it can support a single file > 2Gb. (see man fsadm).

Re: Kernel parameter

James R. Ferguson — Wed, 18 Jun 2003 11:24:29 GMT

Hi:

There are no tunable parameters for 'largefiles' support, per se.
Have a look at the "HP-UX Large Files" whitepaper for a better understanding of the programmatic handling. Yes, 'ftp' supports transfer of very large files.

http://docs.hp.com/hpux/onlinedocs/os/lgfiles4.pdf

Regards!

...JRF...

Re: Kernel parameter

T G Manikandan — Wed, 18 Jun 2003 11:24:48 GMT

Just do a cat /etc/fstab and check whether the large files are enabled for the file system.

If then it should support files >2GB

Re: Kernel parameter

Dario_1 — Wed, 18 Jun 2003 11:24:49 GMT

Hi!!

I think you will only have to make sure the filesystem you are ftp'ing is set for largefiles.

# fsadm -F vxfs -o largefiles /mountpoint

You can determine whether or not 'largefiles' is set by doing:

# fsadm -F vxfs /mountpoint

...you will see "largefiles" or "nolargefiles" as appropriate

Regards,

Dario

Re: Kernel parameter

K.Vijayaragavan. — Wed, 18 Jun 2003 11:30:12 GMT

Does your file system support largefiles. check the /etc/fstab, and see if largefiles option is specified for the corrresponding FS.

Re: Kernel parameter

K.Vijayaragavan. — Wed, 18 Jun 2003 11:49:28 GMT

Check if this URL is useful.

http://docs.hp.com/hpux/onlinedocs/939/KCParms/KCparams.OverviewAll.html

Re: Kernel parameter

Jdamian — Wed, 18 Jun 2003 11:51:46 GMT

Hi.

Dario's suggestions are right.

Checking /etc/fstab is wrong.

Re: Kernel parameter

Geoff Wild — Wed, 18 Jun 2003 11:59:31 GMT

Sure it's possible - no tunable parameter that I'm aware of though....

Are you looking to ftp interanlly? If so, and if possible, use rcp to copy files between systems - I have found rcp to be faster then ftp....

Rgds...Geoff

Re: Kernel parameter

Ian Dennison_1 — Wed, 18 Jun 2003 12:01:09 GMT

J. Damian,

Both answers are right, Dario's is just better practice. Try this,....

Create a file system with largefiles option
Create an entry for it in /etc/fstab with no "largefiles" entry.
Try mounting it.

You will receive an error message stating mount options are incompatible.

The reason 'fsadm' is better is because it interrogates the filesystem directly, rather than assuming that the /etc/fstab entry was the one used when mounting the filesystem.

Share and Enjoy! Ian

Re: Kernel parameter

Dave La Mar — Wed, 18 Jun 2003 16:40:32 GMT

Just an FYI. If the ftp is to a Linux machine, without patching, Linux, at least older versions, has a 2gb limit.

Regards,
dl

Re: Kernel parameter

Paula J Frazer-Campbell — Wed, 18 Jun 2003 16:43:51 GMT

Hi

Ftp of large files:-

zip the file first -- gzip -9

Or split it up and ftp in smaller bits.

Paula

Re: Kernel parameter

Caesar_3 — Wed, 18 Jun 2003 17:12:43 GMT

Hello!

You should enable support for large files
on the dist. machine and then is no problem.

Caesar