Ceph CBT simulate down OSDs

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Hi all,

CBT documentation states that this can be achieved. If so, how do I set it up? What do I add in the yaml file? Below is an EC example. Thanks.

cluster:

  head: "ceph@head"

  clients: ["ceph@client"]

  osds: ["ceph@osd"]

  mons: ["ceph@mon"]

  osds_per_node: 1

  fs: xfs

  mkfs_opts: -f -i size=2048

  mount_opts: -o inode64,noatime,logbsize=256k

  conf_file: /home/ceph/ceph-tools/cbt/example/ceph.conf

  ceph.conf: /home/ceph/ceph-tools/cbt/example/ceph.conf

  iterations: 3

  rebuild_every_test: False

  tmp_dir: "/tmp/cbt"

  pool_profiles:

    erasure:

      pg_size: 4096

      pgp_size: 4096

      replication: 'erasure'

      erasure_profile: 'myec'

benchmarks:

  radosbench:

    op_size: [ 4194304, 524288, 4096 ]

    write_only: False

    time: 300

    concurrent_ops: [ 128 ]

    concurrent_procs: 1

    use_existing: True

    pool_profile: erasure

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