echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
meta-data=/dev/sdb               isize=512    agcount=4, agsize=1966080 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=1
         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=1
         =                       exchange=0  
data     =                       bsize=4096   blocks=7864320, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
log      =internal log           bsize=4096   blocks=16384, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
append_write
wrote 4096/4096 bytes at offset 0
4 KiB, 1 ops; 0.0000 sec (144.676 MiB/sec and 37037.0370 ops/sec)
wrote 4096/4096 bytes at offset 53248
4 KiB, 1 ops; 0.0000 sec (71.023 MiB/sec and 18181.8182 ops/sec)
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
wrote 4096/4096 bytes at offset 4096
4 KiB, 1 ops; 0.0000 sec (53.510 MiB/sec and 13698.6301 ops/sec)
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
truncate_up
wrote 4096/4096 bytes at offset 0
4 KiB, 1 ops; 0.0000 sec (325.521 MiB/sec and 83333.3333 ops/sec)
wrote 4096/4096 bytes at offset 61440
4 KiB, 1 ops; 0.0000 sec (73.703 MiB/sec and 18867.9245 ops/sec)
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
fallocate
wrote 4096/4096 bytes at offset 0
4 KiB, 1 ops; 0.0000 sec (217.014 MiB/sec and 55555.5556 ops/sec)
wrote 4096/4096 bytes at offset 98304
4 KiB, 1 ops; 0.0000 sec (69.754 MiB/sec and 17857.1429 ops/sec)
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds
echo '1' 2>&1 > /sys/fs/xfs/sdb/error/fail_at_unmount
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/max_retries
echo '0' 2>&1 > /sys/fs/xfs/sdb/error/metadata/EIO/retry_timeout_seconds