Rick,
Does this still fail with 2.10.1 or a later client? It may just be a bug in
"lfs" or the client, not an interop problem per-se. If it doesn't fail with a
newer client then it probably isn't worthwhile to track down.
If you _really_ need to get this working with the 2.10.0 client you could try
the "lfs" binary (and possibly liblustreapi.so) from a newer client. Otherwise,
upgrading the kernel modules to 2.10.0+patch is not much different than
upgrading to 2.10.6 or 2.10.7 to fix this problem.
Cheers, Andreas
On Apr 22, 2019, at 15:15, Mohr Jr, Richard Frank wrote:
>
>
> I was trying to play around with some PFL layout today, and I ran into an
> issue. I have a file system running Lustre 2.10.6 and a client with 2.10.0
> installed. I created a PFL with this command:
>
> [rfmohr@sip-login1 rfmohr]$ lfs setstripe -E 4M -c 2 -E 100M -c 4 comp_file
>
> It did not return any errors, so I tried to query the layout:
>
> [rfmohr@sip-login1 rfmohr]$ lfs getstripe comp_file
> comp_file has no stripe info
>
> And if I write any data to it, I end up with a file that uses the system’s
> default stripe count:
>
> [rfmohr@sip-login1 rfmohr]$ dd if=/dev/zero of=comp_file bs=1M count=50
> 50+0 records in
> 50+0 records out
> 52428800 bytes (52 MB) copied, 0.0825892 s, 635 MB/s
>
> [rfmohr@sip-login1 rfmohr]$ lfs getstripe comp_file
> comp_file
> lmm_stripe_count: 1
> lmm_stripe_size: 1048576
> lmm_pattern: 1
> lmm_layout_gen:0
> lmm_stripe_offset: 3
>obdidx objid objid group
> 3265665 0x40dc1 0
>
> I could not find a JIRA ticket that looked similar to this. Is this a known
> bug? Or some odd interop issue? When I tried the command on another file
> system that uses 2.10.3 on the servers and clients, I got the expected
> behavior:
>
> -bash-4.2$ lfs setstripe -E 4M -c 2 -E 64M -c 4 comp_file
>
> -bash-4.2$ lfs getstripe comp_file
> comp_file
> lcm_layout_gen: 2
> lcm_entry_count: 2
>lcme_id: 1
>lcme_flags: init
>lcme_extent.e_start: 0
>lcme_extent.e_end: 4194304
> lmm_stripe_count: 2
> lmm_stripe_size: 1048576
> lmm_pattern: 1
> lmm_layout_gen:0
> lmm_stripe_offset: 6
> lmm_objects:
> - 0: { l_ost_idx: 6, l_fid: [0x10006:0x8f84d:0x0] }
> - 1: { l_ost_idx: 7, l_fid: [0x10007:0x8f72d:0x0] }
>
>lcme_id: 2
>lcme_flags: 0
>lcme_extent.e_start: 4194304
>lcme_extent.e_end: 67108864
> lmm_stripe_count: 4
> lmm_stripe_size: 1048576
> lmm_pattern: 1
> lmm_layout_gen:65535
> lmm_stripe_offset: -1
>
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
>
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> lustre-discuss mailing list
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