VERITAS Storage Foundation 4.1 Cluster File System HP Serviceguard Storage Management Suite Extracts, December 2005

Chapter 6, SFCFS Architecture
About CFS
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LLT links can be added or removed while clients are connected. Shutting down GAB or
the high-availability daemon,
HAD, is not required.
▼ To add a link
# lltconfig -d device -t tag
▼ To remove a link
lltconfig -u tag
Changes take effect immediately and are lost on the next reboot. For changes to span
reboots you must also update /etc/llttab.
Note LLT clients do not recognize the difference unless only one link is available and
GAB declares jeopardy.
I/O Error Handling Policy
I/O errors can occur for several reasons, including failures of Fibre Channel link, host-bus
adapters, and disks. SFCFS disables the file system on the node encountering I/O errors.
The file system remains available from other nodes.
After the hardware error is fixed (for example, the Fibre Channel link is reestablished), the
file system can be force unmounted and the mount resource can be brought online from
the disabled node to reinstate the file system.