Synology Parity Consistency Controle to control and check with terminal commands the process

Synology parity consistency controle terminal commands. How to see the status of the check and control it for example to let it run faster. Also to see where logging takes places.

Running this commands are at your own risk!  

start ssh session with Synology NAS.

as root:

To check the status of the running parity consistency check:

cat /proc/mdstat

You can also see the speed.  speed=

Showing the running speed:

cd /sys/block/md<X>/md

Where X is your volume, md0 and md1 are system partitions. So md2 would be the first volume

cat sync_speed will show the running speed

To control speed:

cd /sys/block/md<X>/md :

Where X is your volume, md0 and md1 are system partitions. So md2 would be the first volume

cat sync_speed_min

cat sync_speed_max

By changing this values you can control the speed.

echo <value> >sync_speed_max

The standard value sync_speed_max is high so there is no limit.  By lowering this value you can max the speed and slow down the process.

The standard value sync_speed_min is set low By making this value higher you can try to speed up the process. Just check the current speed and try to make this setting higher and check what happens.

Start/Stop and Pause the parity check

cd /sys/block/md<X>/md :

Where X is your volume, md0 and md1 are system partitions. So md2 would be the first volume

Start:

echo check > /sys/block/mdX/md/sync_action

Pause:

There is no actual pause, since you will still fall back a little bit or resume from the beginning if you reboot the unit. But below is the closest one.

#echo idle > /sys/block/mdX/md/sync_action

Stop:

#echo frozen > /sys/block/mdX/md/sync_action

You will need to replace mdX with your volume. For example, md2, md3... ( md0, md1 are system partitions. )

Where logging takes place? 

/var/log/kern.log

To change debug setting:

cd /sys/block/md<X>/md :

Where X is your volume, md0 and md1 are system partitions. So md2 would be the first volume

echo 1 > sync_debug

tail -f /var/log/kern.log will show the last messages

Messages like this to watch for:

md: data-check of RAID array md2

md: md2: data-check stop due to MD_RECOVERY_INTR set.

md: md_do_sync() got signal ... exiting

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