System and Startup Files

This section explains the files necessary for DiskSuite to operate correctly. For the most part, you do not have to worry about these files because DiskSuite accesses (updates) them automatically (with the exception of md.tab).

• /etc/lvm/mddb.cf

  A file that records the locations of state database replicas. When state database replica locations change, DiskSuite makes an entry in the mddb.cf file that records the locations of all state databases. Similar information is entered into the /etc/system file.

• /etc/lvm/md.tab

  An input file that you can use along with the command line utilities metainit(1M), metadb(1M), and metahs(1M) to create metadevices, state database replicas, or hot spares. A metadevice, group of state database replicas, or hot spare may have an entry in this file.

The configuration information in the /etc/lvm/md.tab file may differ from the current metadevices, hot spares, and state database replicas in use. It is only used at metadevice creation time, not to recapture the DiskSuite configuration at boot.

• /etc/lvm/md.cf

  A backup file of a "local" diskset's configuration. DiskSuite provides the md.cf file for recovery. When you change the DiskSuite configuration, DiskSuite automatically updates the md.cf file (except for hot sparing).

You should not directly edit either the mddb.cf or md.cf files.

• /kernel/drv/md.conf

  DiskSuite uses this configuration file at startup. You can edit two fields in this file: nmd, which sets the number of metadevices that the configuration can support, and md_nsets, which is the number of disksets. The default value for nmd is 128, which can be increased to 1024. The default value for md_nsets is 4, which can be increased to 32. The total number of disksets is always one less than the md_nsets value, because the local set is included in md_nsets.

• /etc/lvm/mdlodg.cf

  DiskSuite uses this file to control the behavior of the DiskSuite mdlogd SNMP trap generating daemon. It is an editable ASCII file that specifies where the SNMP trap data should be sent when the DiskSuite driver detects a specified condition.

• /etc/rcS.d/S35lvm.init

  For automatic reloading of metadevice configuration at boot.

• /etc/rc2.d/S95lvm.sync

  For automatic resyncing of metadevices.

For more information on DiskSuite system files, refer to the man pages.