HP-UX VxFS tuning and performance - filibeto.org

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18 Creating your file system When you create a file system using newfs(1m) or mkfs(1m), you need to be aware of several options that could affect performance. Block size The block size (bsize) is the smallest amount of space that can be allocated to a file extent. Most applications will perform better with an 8 KB block size. Extent allocations are easier and file systems with an 8 KB block size are less likely to be impacted by fragmentation since each extent would have a minimum size of 8 KB. However, using an 8 KB block size could waste space, as a file with 1 byte of data would take up 8 KB of disk space. The default block size for a file system scales depending on the size of the file system when the file system is created. The fstyp(1M) command can be used verify the block size of a specific file system using the f_frsize field. The f_bsize can be ignored for VxFS file systems as the value will always be 8192. # fstyp -v /dev/vg00/lvol3 vxfs version: 6 f_bsize: 8192 f_frsize: 8192 The following table documents the default block sizes for the various VxFS versions beginning with VxFS 3.5 on 11.23: Table 2. Default FS block sizes FS Size DLV 4 DLV 5 >= DLV6
Table 3. Default intent log size FS Size VxFS 3.5 or 4.1 or DLV = 6
Page 1 and 2: HP-UX VxFS tuning and performance T
Page 3 and 4: Understanding VxFS In order to full
Page 5 and 6: File system reorganization attempts
Page 7 and 8: Read ahead with VxVM stripes The de
Page 9 and 10: Figure 4. Flush behind As data is w
Page 11 and 12: The read flush behind feature has t
Page 13 and 14: Note The OnlineJFS license is requi
Page 15 and 16: Concurrent I/O The main problem add
Page 17: Zero Filled On Demand (ZFOD) extent
Page 21 and 22: Using datainlog has no affect on no
Page 23 and 24: Table 4. Intent log flush behavior
Page 25 and 26: ead_ahead The default read_ahead va
Page 27 and 28: Unified File Cache on HP-UX 11i v3
Page 29 and 30: Note When setting vx_ninode to redu
Page 31 and 32: Patches Performance problems are of

HP-UX VxFS tuning and performance - filibeto.org

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