[lustre-discuss] Unexpected result with overstriping

John Bauer bauerj at iodoctors.com
Fri May 17 07:48:10 PDT 2024


Good morning all,

I am playing around with overstriping a bit and I found a behavior that, 
to me, would seem unexpected.  The documentation for -C -1  indicates 
that the file should be striped over all available OSTs.  The pool, 
which happens to be the default, is ssd-pool which has 32 OSTs.  I got a 
stripeCount of 2000.  Is this as expected?

pfe20.jbauer2 213> rm -f /nobackup/jbauer2/ddd.dat
pfe20.jbauer2 214> lfs setstripe -C -1 /nobackup/jbauer2/ddd.dat
pfe20.jbauer2 215> lfs getstripe /nobackup/jbauer2/ddd.dat
/nobackup/jbauer2/ddd.dat
lmm_stripe_count:  2000
lmm_stripe_size:   1048576
lmm_pattern:       raid0,overstriped
lmm_layout_gen:    0
lmm_stripe_offset: 119
lmm_pool:          ssd-pool
     obdidx         objid         objid         group
        119          52386287        0x31f59ef                 0
        123          52347947        0x31ec42b                 0
        127          52734487        0x324aa17                 0
        121          52839396        0x32643e4                 0
        131          52742709        0x324ca35                 0
        116          52242659        0x31d28e3                 0
        117          51831125        0x316e155                 0
        124          52425218        0x31ff202                 0
        125          52402722        0x31f9a22                 0
        106          52700581        0x32425a5                 0

edited for brevity

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