Veritas File System 5.1 SP1 Release Notes

then upgrade to Version 7 on a mounted file system. Use the vxfsconvert (1M) command to
convert an unmounted file system to VxFS DLV 7.
NOTE: A DLV 8 file system created with VxFS 5.1 SP1 software is not accessible if the VxFS
5.1 SP1 file system software is removed and the system is reverted to VxFS 5.0, which is the
default supported with the HP-UX 11i v3 release.
Tuning VxFS for Performance
• Tuning down the inode cache
VxFS allocates and releases inodes based on the file system load. Generally, larger inode
caches help the file system to perform better in the case of a file server or web server load.
The global tunable, vx_ninode, determines the maximum possible size of the VxFS inode
cache. If the default value of vx_ninode is set to zero, VxFS automatically tunes the size of
the inode cache at boot time, based on the size of the physical memory on the system. On
systems with a RAM size of less than or equal to 1 GB, you can manually tune down
vx_ninode to a value not less than that of ninode. If the user does not manually tune the
value of vx_ninode, then VxFS calculates vx_ninode value based on system memory. VxFS
ensures that the value of vx_ninode is not less than ninode. For more information on these
commands, see vx_ninode(5).
• Tuning down the buffer cache
VxFS 5.1 SP1 implements a private buffer cache to use exclusively for metadata. The allocations
to this buffer cache vary during system usage based on the file system load and the maximum
cache size specified in the global (static) tunable, vxfs_bc_bufhwm. If the value of
vxfs_bc_bufhwm is set to zero, VxFS automatically tunes the maximum size of the metadata
buffer cache at boot time, based on the system memory size. On systems with a RAM size of
1 GB or less, you can manually tune down the value of vxfs_bc_bufhwm to a minimum of
6144 (6 MB). If the user does not manually tune the value of vxfs_bc_bufhwm then VxFS
calculates vxfs_bc_bufhwm value based on system memory. VxFS ensures that the value
of vxfs_bc_bufhwm is not less than 800 KB.
For more information on tuning VxFS, see the following documents:
• Common Misconfigured HP-UX Resources
• Veritas File System 5.1 SP1 Administrator’s Guide
To locate these documents, go to the HP-UX Core docs page at: www.hp.com/go/hpux-core-docs.
On this page, select HP-UX 11i v3.
NOTE: VxFS consumes a fixed percentage of memory for storing the default values of tunables,
such as vx_ninode and vxfs_bc_bufhwm. For example, VxFS consumes nearly 10% of the
total physical memory for the default value of vx_ninode. If the system has 512 MB of memory,
VxFS requires up to 52 MB to store the VxFS inode cache. Therefore, it is necessary to tune the
tunables according to the type of load on the system.
Product Licensing
Following are the features enabled by the HP OnlineJFS and HP Serviceguard Storage Management
licenses:
• HP OnlineJFS License
Table 1 (page 7) lists the features enabled by the HP OnlineJFS license.
6 Veritas File System 5.1 SP1 Release Notes