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2.3. Questions

  1. From the following information calculate the stripe unit and width:
    meta-data=/dev/sda4              isize=256    agcount=16, agsize=923264 blks
             =                       sectsz=512   attr=0
    data     =                       bsize=2048   blocks=14771760, imaxpct=25
             =                       sunit=128    swidth=256 blks, unwritten=1
    naming   =version 2              bsize=4096
    log      =internal log           bsize=2048   blocks=7296, version=1
             =                       sectsz=512   sunit=0 blks
    realtime =none                   extsz=65536  blocks=0, rtextents=0
  2. What would be the conseqence of not aligning a filesystem on a stripe unit correctly?
  3. What are the advantages of an external log?
  4. Why would having very few or very many allocation groups be a bad idea?