Re: [lustre-discuss] lfs setstripe with stripe_count=0

2023-02-24 Thread Andreas Dilger via lustre-discuss 
On Feb 21, 2023, at 10:26, John Bauer 
mailto:bau...@iodoctors.com>> wrote:

Something doesn't make sense to me when using lfs setstripe when specifying 0 
for the stripe_count .  This first command works as expected.  The pool is the 
one specified, 2_hdd, and the -c 0 results in a stripe_count of 1 which I 
believe is the default for the file-system default ( per the lfs setstripe 
manpage ).

pfe24.jbauer2 1224> lfs setstripe -c 0 -p 2_hdd /nobackupp18/jbauer2/testing/
pfe24.jbauer2 1225> lfs getstripe -d /nobackupp18/jbauer2/testing/
stripe_count:  1 stripe_size:   1048576 pattern:   raid0 stripe_offset: -1 
pool:  2_hdd


If I do not specify the pool and only specify the stripe_count as 0, the 
resulting striping is what I believe is the pfl striping from the root 
directory of the file system.  Is this what is expected?  I would expect a 
stripe_count of 1, as above, with the pool from the parent directory's striping.

pfe24.jbauer2 1226> lfs setstripe -c 0 /nobackupp18/jbauer2/testing/

If you specify "-c 0" the "specified" file layout ends up being the same "all 
default values" as if nothing was specified for the layout at al (i.e. "-c 0 -i 
-1 -S 0")l, which results in the default filesystem layout being used.  If any 
non-default value is specified then the rest of the layout is filled in from 
the default values.

pfe24.jbauer2 1227> lfs getstripe -d /nobackupp18/jbauer2/testing/
  lcm_layout_gen:0
  lcm_mirror_count:  1
  lcm_entry_count:   3
lcme_id: N/A
lcme_mirror_id:  N/A
lcme_flags:  prefer
lcme_extent.e_start: 0
lcme_extent.e_end:   268435456
  stripe_count:  1   stripe_size:   16777216 pattern:   raid0   
stripe_offset: -1 pool:  ssd-pool

lcme_id: N/A
lcme_mirror_id:  N/A
lcme_flags:  prefer
lcme_extent.e_start: 268435456
lcme_extent.e_end:   5368709120
  stripe_count:  -1   stripe_size:   16777216 pattern:   raid0  
 stripe_offset: -1 pool:  ssd-pool

lcme_id: N/A
lcme_mirror_id:  N/A
lcme_flags:  0
lcme_extent.e_start: 5368709120
lcme_extent.e_end:   EOF
  stripe_count:  16   stripe_size:   16777216 pattern:   raid0  
 stripe_offset: -1 pool:  hdd-pool

pfe24.jbauer2 1228>

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Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud







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[lustre-discuss] lfs setstripe with stripe_count=0

2023-02-21 Thread John Bauer 
Something doesn't make sense to me when using lfs setstripe when 
specifying 0 for the stripe_count .  This first command works as 
expected.  The pool is the one specified, 2_hdd, and the -c 0 results in 
a stripe_count of 1 which I believe is the default for the file-system 
default ( per the lfs setstripe manpage ).


pfe24.jbauer2 1224> lfs setstripe -c 0 -p 2_hdd 
/nobackupp18/jbauer2/testing/

pfe24.jbauer2 1225> lfs getstripe -d /nobackupp18/jbauer2/testing/
stripe_count:  1 stripe_size:   1048576 pattern:   raid0 
stripe_offset: -1 pool:  2_hdd


pfe24.jbauer2 1226>


If I do not specify the pool and only specify the stripe_count as 0, the 
resulting striping is what I believe is the pfl striping from the root 
directory of the file system.  Is this what is expected?  I would expect 
a stripe_count of 1, as above, with the pool from the parent directory's 
striping.


pfe24.jbauer2 1226> lfs setstripe -c 0 /nobackupp18/jbauer2/testing/
pfe24.jbauer2 1227> lfs getstripe -d /nobackupp18/jbauer2/testing/
  lcm_layout_gen:    0
  lcm_mirror_count:  1
  lcm_entry_count:   3
    lcme_id: N/A
    lcme_mirror_id:  N/A
    lcme_flags:  prefer
    lcme_extent.e_start: 0
    lcme_extent.e_end:   268435456
  stripe_count:  1   stripe_size:   16777216 pattern:   
raid0   stripe_offset: -1 pool:  ssd-pool


    lcme_id: N/A
    lcme_mirror_id:  N/A
    lcme_flags:  prefer
    lcme_extent.e_start: 268435456
    lcme_extent.e_end:   5368709120
  stripe_count:  -1   stripe_size:   16777216 pattern:   
raid0   stripe_offset: -1 pool:  ssd-pool


    lcme_id: N/A
    lcme_mirror_id:  N/A
    lcme_flags:  0
    lcme_extent.e_start: 5368709120
    lcme_extent.e_end:   EOF
  stripe_count:  16   stripe_size:   16777216 pattern:   
raid0   stripe_offset: -1 pool:  hdd-pool


pfe24.jbauer2 1228>

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