[lustre-discuss] Usage for lfs setstripe -o ost_indices

[Ms. Megan Larko]

Greetings List!

What is the correct invocation of specifying exact stripe layout in Lustre?

I am attempting to use the --ost | -o option to lfs setstripe.  The
Lustre_Operations_Manual as of 16 May 2018 Section 38.1.3 indicates that
--ost-index "option is used to specify the exact stripe layout on the the
[sic] file system.  ost_indices is a list of OSTs referenced by their
indices and index ranges separated by commas."

A "man lfs setstripe" in Lustre 2.10.1 shows the -o or --ost-list
<ost_indices> may be a range separated by commas with the example of -o
1,2-4,7 (for -c 5).

The "usage" of "lfs setstripe" in Lustre 2.10.1 shows -o or --ost
<ost_indices>.
So all cases indicate "-o" is an acceptable flag for specifying exact
stripe layout.

I have been attempting this command on a directory on a Lustre-2.10.4
storage from a Lustre 2.10.1 client and I fail with the following message:
> lfs setstripe -c 4 -S 1m  -o 1,2-4 custTest/
error on ioctl 0x4008669a for 'custTest' (3): Invalid argument
error: setstripe: create striped file 'custTest' filed: Invalid argument

Permutation "lfs setstripe -c 4 -S 1m --ost 1,2-4 custTest/" returns same
ioctl error.

I receive exactly the same error when varying the specification of -o (1-4,
1,2,3,4 etc).  I have tried using the "lctl dl" index number for the OST
desired--nope.

I noticed the ioctl is always 0x4008669a regardless of the system on which
I run the command using -o or --ost or --ost-list.

What is the correct invocation for "lfs setstripe" using -o?

Cheers,
megan
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