Article ID: 125505, created on May 14, 2015, last review on May 14, 2015

  • Applies to:
  • Virtuozzo 6.0

Symptoms

Under certain circumstances, PStorage cluster get "freezing" when "rm-cs" is called.

  • Read\write speed to the cluster storage slows down.

  • virtual machines can get into PAUSED state until replication completes.

Cause

Chunk removing increases replication load to the nodes in cluster.

Resolution

This behavior will be optimized in scope of the product issue PSBM-31616 to coordinate replication speed with the cluster activity.

Workaround

It is suggested to perform rm-cs operations in the maintenance window when IO load is low.

In case if it is needed to decrease replication load, the minimum replication limit may be set to a lower value, e.g.:

# pstorage -c pcs01 get-attr /pstorage/pcs01 |grep replicas
connected to MDS#5
  replicas=3:2

# pstorage -c pcs01 set-attr -R /pstorage/pcs01 replicas=3:1

Search Words

remove cs

remove chunk server

rm-cs

replication speed

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