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  1. Lustre
  2. LU-12328

FLR mirroring on 2.12.1-1 not usable if OST is down

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Details

    • Bug
    • Resolution: Fixed
    • Major
    • Lustre 2.13.0, Lustre 2.12.4
    • Lustre 2.12.1
    • None
    • RHEL 7.6
    • 3
    • 9223372036854775807

    Description

      See below for stripe details on the file "mirror10". If OST idx 1 is unmounted and made unavailable, performance drops down to 1/10th of expected performance. The client has to timeout on OST idx1 before it tries to read from OST idx 7. This happens for each 1MB block as that is the block size being used resulting in very poor performance. 

       

       

      $ lfs getstripe mirror10
      mirror10
       lcm_layout_gen: 5
       lcm_mirror_count: 2
       lcm_entry_count: 2
       lcme_id: 65537
       lcme_mirror_id: 1
       lcme_flags: init
       lcme_extent.e_start: 0
       lcme_extent.e_end: EOF
       lmm_stripe_count: 1
       lmm_stripe_size: 1048576
       lmm_pattern: raid0
       lmm_layout_gen: 0
       lmm_stripe_offset: 1
       lmm_pool: 01
       lmm_objects:
       - 0: { l_ost_idx: 1, l_fid: [0x100010000:0x280a8:0x0] }
      
      lcme_id: 131074
       lcme_mirror_id: 2
       lcme_flags: init
       lcme_extent.e_start: 0
       lcme_extent.e_end: EOF
       lmm_stripe_count: 1
       lmm_stripe_size: 1048576
       lmm_pattern: raid0
       lmm_layout_gen: 0
       lmm_stripe_offset: 7
       lmm_pool: 02
       lmm_objects:
       - 0: { l_ost_idx: 7, l_fid: [0x100070000:0x28066:0x0] }
      

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              bobijam Zhenyu Xu
              raot Joe Frith
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                Created:
                Updated:
                Resolved: