3.4.0 Matrix Server Command Reference

Chapter 1: PolyServe Matrix Server Commands 17

mxsanlk.exe – display status of SAN locks

Synopsis

tools\mxsanlk

Description

PolyServe Matrix Server uses a set of disk-based data structures called

SANlocks to protect filesystem integrity. If a problem causes a matrix to split

into two or more network partitions, the SANlocks ensure that only one of the

resulting network partitions has access to the SAN.

Each SANlock is stored in a membership partition. Before a matrix can begin

accessing the SAN, it must first acquire a majority of the SANlocks. The

SANlocks are acquired in order.

mxsanlk displays the status of the SANlock stored in each membership

partition. It can be used to determine whether any of the membership

partitions need to be repaired. Also, if a network partition occurs, mxsanlk

can be used to determine which network partition has control of the SAN.

Following is some sample output. The command was issued on host

10.10.30.3. The SDMP administrator is the administrator for the matrix to

which the host belongs. There are three membership partitions.

# mxsanlk

This host: 10.10.30.3

This host’s SDMP administrator: 10.10.30.1

Membership Partition SANlock State

-------------------- -------------

psd1p1 held by SDMP administrator

psd2p1 held by SDMP administrator

psd3p3 held by SDMP administrator

Any of these messages can appear in the “SANlock State” column.

• held by SDMP administrator

The SANlock was most recently held by the SDMP administrator of the

matrix to which the host where mxsanlk was run belongs.