hcheck

NAME

hcheck - Cluster checker

SYNOPSIS

hcheck {backend options...} [algorithm options...] [reporting options...]

hcheck –version

Backend options:

{ -m cluster | -L[ path ] | **-t data-file | -I path }

Algorithm options:

[ –no-simulation ] [ –max-cpu *cpu-ratio* ] [ –min-disk *disk-ratio* ] [ -l *limit* ] [ -e *score* ] [ -g *delta* ] [ –min-gain-limit *threshold* ] [ -O *name...* ] [ –no-disk-moves ] [ –no-instance-moves ] [ -U *util-file* ] [ –ignore-dynu ] [ –ignore-soft-errors ] [ –evac-mode ] [ –select-instances *inst...* ] [ –exclude-instances *inst...* ] [ –no-capacity-checks ]

Reporting options:

[–machine-readable**[=*CHOICE*] **] [ -p[ *fields* ] ] [ –print-instances ] [ -v... | -q ]

DESCRIPTION

hcheck is the cluster checker. It prints information about cluster’s health and checks whether a rebalance done using hbal would help.

This information can be presented in both human-readable and machine-readable way.

Note that it does not take any action, only performs a rebalance simulation if necessary.

For more information about the algorithm details check hbal(1).

Additionally, hcheck also checks if the cluster is globally N+1 redundant. That is, it checks for every node, if after failing over the DRBD instances all instances on that node that with disks externally stored can be restarted on some other node.

OPTIONS

–no-simulation

Only perform checks based on current cluster state, without trying to simulate rebalancing.

–no-capacity-checks

Do not check for global N+1 redundancy, i.e., do not warn if the shared-storage instances of one node cannot be moved to the others should that node fail.

For a detailed description about the options listed above have a look at htools(1), hspace(1) and hbal(1).