VERITAS File SystemÖ 3.5 (HP OnlineJFS/JFS3.5) AdministratorÆs Guide (December 2002)

Appendix A
VERITAS File System Quick Reference
Mounting a File System
98
Mount Options
The mount command has numerous options to tailor a file system for various functions and environments.
Some specific_options are listed below.
• Security feature
If security is important, use blkclear to ensure that deleted files are completely erased before the space
is reused.
• Support for large files
If you specify the largefiles option, you can create files larger than two gigabytes on the file system.
• Support for cluster file systems
If you specify the cluster option, the file system is mounted in shared mode. Cluster file systems depend
on several other VERITAS products that must be correctly configured before a complete clustering
environment is enabled.
• Using Storage Checkpoints
The -o ckpt=checkpoint_name option mounts a Storage Checkpoint of a mounted file system that was
previously created by the fsckptadm command.
• Using databases
If you are using databases with VxFS and if you have installed a license key for the VERITAS Quick I/O
for Databases feature, the mount command enables Quick I/O by default (the same as specifying the qio
option). The noqio option disables Quick I/O. If you do not have Quick I/O, mount ignores the qio option.
Alternatively, you can increase database performance using the mount option convosync=direct, which
utilizes direct I/O. See “Quick I/O for Databases” on page 77 for more information.
• News file systems
If you are using cnews, use delaylog (or tmplog), mincache=closesync because cnews does an fsync()
on each news file before marking it received. The fsync() is performed synchronously as required, but
other options are delayed.
• VERITAS QuickLog
If you are using QuickLog, you can improve I/O performance by moving logging to a seperate disk device
by using qlog=[
dev ]. See “VERITAS QuickLog” on page 87 for more information.
• Temporary file systems
For a temporary file system such as /tmp, where performance is more important than data integrity, use
tmplog, mincache=tmpcache.
See “Choosing mount Command Options” on page 19 and the following manual pages for more information
about the mount command and its available options:
fstab (4)
fsckptadm (1M)
mount (1M)
mount_vxfs (1M)
Example To mount the file system /dev/vx/dsk/fsvol/vol1 on the /ext directory with read/write access
and delayed logging, enter:
# mount -F vxfs -o delaylog /dev/vx/dsk/fsvol/vol1 /ext