[Lustre-discuss] specifying OST

[Kilian CAVALOTTI]

Hi Mag, 

On Friday 11 July 2008 04:38:40 am Mag Gam wrote:
> is it possible to create a file on a particular OST?

I guess you can do so using the "lfs setstripe" command. You can set the 
stripping information on a file or directory so that it only uses one 
OST. That's the case by default, but you need to use setstripe to 
specify which OST you want to use.

For instance, the following command will put "yourfile" of the first OST 
(id 0):
	
	$ lfs setstripe --count 1 --index 0 yourfile

	$ dd if=/dev/zero of=yourfile count=1 bs=100M
	1+0 records in
	1+0 records out

	$ lfs getstripe yourfile
	OBDS:
	0: home-OST0000_UUID ACTIVE
	[...]
	yourfile
        	obdidx           objid          objid            group
        	     0        33459243      0x1fe8c2b                0

Cheers,
-- 
Kilian