On this page you will find some useful commands to troubleshoot ESOS. This list is not complete and may become larger in the future.

Log management

Check the boot print (log)

# dmesg

Watch content of files with a refresh rate of 2 seconds

# watch cat /sys/block/bcache0/bcache/dirty_data

Performance management

Check load

# top

# iostat -x 

System file checks and repairs

# fdisk -l | less

Check file systems

# e2fsck

# fsck.xfs /dev/bcache0

Repair file systems

# xfs_repair /dev/bcache0

Cache management

Bcache

Flush (dirty) cache of the caching device to the backing device:

# echo 0 > /sys/block/bcache0/bcache/writeback_percent

When cache is clean you may want to set writeback_percent back to its default value 10:

# echo 10 > /sys/block/bcache0/bcache/writeback_percent

Switch cache mode between writethrough and writeback:

# echo writethrough > /sys/block/bcache0/bcache/cache_mode

# echo writeback > /sys/block/bcache0/bcache/cache_mode

For SSD cache performance testing disable the default 4 MB sequential_cutoff by executing:

# echo 0 > /sys/block/bcache0/bcache/sequential_cutoff

After benchmarking set the value back to:

# echo 4M > /sys/block/bcache0/bcache/sequential_cutoff