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We recommend setting maxpgahead to the maximum of 256. When tuning
maxpgahead you must also adjust the maxfree parameter to allow room for this
data. The maxfree parameter should equal minfree+maxpgahead (or later), as
shown in Example 15-20.
Example 15-20 Tuning pre AIX 5.2 read-ahead algorithms
/usr/samples/kernel/vmtune -R256 -f120 -F376
The vmtune settings do not survive system reboot. Place them in a script run by
/etc/inittab on startup.
On AIX 5.2 and later, the vmtune command is replaced by vmo and ioo commands.
See Example 15-21.
Example 15-21 Tuning AIX 5.2 and later read-ahead algorithms
vmo -o maxfree=376
vmo -o minfree=120
ioo -o maxpgahead=256
ioo -o j2_maxPageReadAhead=256
For more information about the commands, see the AIX documentation or man
pages for vmtune, vmo, and ioo.
15.6.5 Use NTFS partitions for the server
In a Microsoft Windows environment, place the Tivoli Storage Manager server
recovery log, database, and disk storage pool volumes on partitions formatted
using NTFS. NTFS has the following advantages:
It offers support for larger disk partitions than FAT.
It has better data recovery.
It has better file security.
Formatting Tivoli Storage Manager storage pool volumes on NTFS partitions
is much faster than on FAT partitions.
Warning: NTFS file compression must not be used on disk volumes that are
used by the Tivoli Storage Manager server, because of the potential for
performance degradation.
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IBM Tivoli Storage Manager Implementation Guide
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