AIX Version 4.3 Differences Guide

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Creating the Local Cache File System A local cache file system is created by using the cfsadmin command with the -c flag, as shown in the following steps: 1. Login as root. 2. Create a cache using the -c flag of the cfsadmin command # cfsadmin -c -o where parameters specify resource parameters, and cache-directory is the name of the directory where the cache should be created. A list of configurable parameters is shown in Table 40 on page 185. Although the cache is referred to as a cache filesystem, it is not a filesystem in the true sense. It is, in fact, a cache directory, which resides on a normal JFS. For this reason, if you are creating a large cache filesystem, it is advisable to create a dedicated JFS to be used for this purpose. This is because the cache filesystem is created with parameters that indicate the percentage of the underlying filesystem it is allowed to use. 3. Mount the back file system in the cache # mount -V cachefs -o backfstype=nfs,cachedir=/ \ remhost:/ where remhost:/ is the name of the remote host and file system where the data resides, and is the mount point on the client where the remote file system should be mounted. CacheFS can also be administered using SMIT. Cached File Systems Consistency Checking To ensure that the cached directories and files are kept up to date, CacheFS periodically checks consistency of files stored in the cache. To check consistency, CacheFS compares the current modification time to the previous modification time. If the modification times are different, all data and attributes for the directory or file, are purged from the cache, and new data and attributes are retrieved from the back file system. When a user requests an operation on a directory or file, CacheFS checks if it is time to verify consistency. If so, CacheFS obtains the modification time from the back file system and performs the comparison. Note: It is important to remember that CacheFS is intended to be used as a mechanism for reducing network and server workload. Because the remote file system data is held locally on the client, and consistency is only checked at intervals, it means that the data on the server can change, and the client is unaware of this for a period of time. You should, therefore, only use it for read-only, or read-mostly, file systems where the file system contents do not change rapidly. One example where CacheFS would be suitable is in a CAD environment where master-copies of drawing components can be held on the server and cached-copies kept on the client workstation when in use. 184 AIX Version 4.3 Differences Guide
7.14.1.3 CacheFS Commands New commands specific to CacheFS are: • cfsadmin • fsck_cachefs cfsadmin The cfsadmin command provides for the following CacheFS administration functions: • Creating cached file systems • Deleting cached file systems • Listing cache contents and statistics • Changing CacheFS resource parameters The cfsadmin command syntax is: cfsadmin -c [ -o cachefs-parameters ] cache_directory cfsadmin -d [ cache_id | all ] cache_directory cfsadmin -l cache_directory cfsadmin -s [ mount point | all ] cache_directory cfsadmin -u [ -o cachefs-parameters ] Table 40 details the cfsadmin options. Table 40. cfsadmin Options Flag Description -c Creates a cache under the directory specified by cache_directory. The directory must not exist prior to cache creation. -d Removes the file system specified by cache_id and releases its resources or removes all file systems if all is specified. -l Lists file systems stored in the specified cache with their statistics. -s Requests a consistency check on the specified file system, or all file systems, if all is specified. -u Updates resource parameters of the specified cache directory. Note that parameter values can only be increased, decreasing requires cache removal and recreation. -o CacheFS resource parameters see Table Table 41 for details. Table 41 details CacheFS resource parameters. Table 41. CacheFS Resource Parameters Parameter maxblocks=n minblocks=n Description Maximum amount of storage space that CacheFS can use, expressed as a percentage of the total number of blocks in the front file system. Default=90% Minimum amount of storage space that CacheFS is always allowed to use, expressed as a percentage of the total number of blocks in the front file system. Default=0% Networking Enhancements 185
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AIX Version 4.3 Differences Guide R
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Take Note! Before using this inform
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2.12.5 Boot Logical Volume Scaling
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Chapter 6. System Management and Ut
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7.1.8 Commands and Applications Ena
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8.2.23.1 Input Method Values . . .
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10.6 National Language Enhancements
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xiv AIX Version 4.3 Differences Gui
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51. Documentation Search Service. .
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51. List of Locales for Euro-Specif
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The authors of the First Edition ar
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xxii AIX Version 4.3 Differences Gu
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The RS/6000 Enterprise Server Model
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• 1 MB of Level 2 (L2) cache. •
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The Model 260 is designed for custo
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Table 3 is a comparison of various
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1.6 Gigabit Fibre Channel Adapter A
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12 AIX Version 4.3 Differences Guid
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work as on previous releases of AIX
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For AIX systems using AIX Version 3
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destructive overlay can be caught w
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The maximum number of file descript
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2.12.1.2 Network Memory Buffer Pool
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2.12.3 Larger Pipe Buffer Pool The
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The nice value has a much greater i
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Table 9. Old Priority Algorithm, sc
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where it can be directly manipulate
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one trillion terabytes. Other 64-bi
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ecently used mappings of segment nu
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• Executable data and BSS Followi
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Figure 6. Interfacing 64-Bit Proces
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that can be larger than 2 32 for la
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The addr struct is a library-side s
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It is also possible to have a situa
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A single remap struct fits into a s
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Depending on the execution environm
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3.2.4.2 Parameter Passing Examples
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On AIX 4.3, the same algorithm is u
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All of the following services are e
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UNIX98 interface will add very litt
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cases, the user is free to override
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These ANSI types are defined throug
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The following libraries and APIs ar
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symbols exported with svc3264 are a
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In general, no command user interfa
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mlockall() mq_getattr() mq_open() m
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from the address space. Termination
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4.3.2 The M:N Model In the M:N mode
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sharing the VPs. When the mutex loc
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4.4 Pthreads Suspend and Resume (4.
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4.6.1 Opening Files for Direct I/O
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performance of network memory buffe
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The send_file call only supports th
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• The volume group's disks must b
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The relationship of factor -t, PP n
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The LVM in AIX 4.3.2 supports both
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MAX LVs: 256 FREE PPs: 81 (324 mega
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extended to 511 logical volumes and
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Note Although the chlvcopy command
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Figure 11. Default SMIT Menu SMIT p
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• NIM Install Manager Figure 13 s
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interface. Web-Based System Manager
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configuration change tasks in which
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Find Close Exit Opens a search dial
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Tree Changes the presentation of ic
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6.2.5.11 Status Line The status lin
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Note: The Web-Based System Manager
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A multiple selection is enabled for
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Figure 23. Example of Container Win
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6.4.3 Registered Applications This
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6.5 Daylight Savings Time Before AI
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keep the data and index files synch
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At the end of the install a volume
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cloned alt_inst_rootvg. The default
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6.8.4 Alternate Disk Installation E
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hdisk0 00006091aef8b687 rootvg hdis
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Support in SMIT was updated to allo
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6.10 System Resource Controller Sub
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The browser must be a forms-capable
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Figure 50. Documentation Search Ser
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If you have not run Netscape previo
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Previously, the man command had to
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Single-Byte Character Set Support (
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abandoning its standards-based inte
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• __mblen_std() - For all other c
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Locale method Unicode locales ISO88
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Unicode Locale Chinese (Traditional
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10.5 Euro Symbol Support for AIX (4
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Any UTF-8 based locale installed on
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Encoding UTF-8 multi-byte: Byte S
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Keyword p_sign_posn n_sign_posn Des
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Table 54 summarizes the AIX keyboar
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10.5.4 Input Methods for the Euro S
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A selection menu can be closed by p
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Figure 55. UNIVERSAL Input Method:
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Table 56 summarizes the new iconv c
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Converter Type Fileset UCS-2_IBM-11
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• X11.loc.XX_XX.Dt.rte • X11.lo
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Figure 56. German UTF-8: Add Additi
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SMIT uses the chlang command to set
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os.loc.iso.de_DE bos.loc.iso.en_US
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• Thai Cultural Conventions (Unic
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In Japan, most of operating systems
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X11.base.rte This fileset ships the
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Documentation Search Service does n
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Figure 59. Searching Japanese Docum
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Figure 61. A Japanese Book 10.7.3.2
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Figure 63. Input Chinese Character
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Figure 65. A Chinese Book for Insta
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Client 3 capabilities. In this case
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Figure 67. Stand-Alone LDAP Directo
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provides encryption of data and tra
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Changes to schema definitions previ
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304 AIX Version 4.3 Differences Gui
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environments may vary significantly
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• AIX Version 4 Getting Started,
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• http://www.lexmark.com • http
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How Customers Can Get ITSO Redbooks
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LDIF LFT LID LP LPI LPP LPR/LPD LDA
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authentication 300 authentication h
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E ed command 141 EDTMPDIR 141 effec
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kernel changes. crash command 17 de
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-command security 166 RDB glue 299
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web based systems management 95 arc
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SG24-2014-01 Printed in the U.S.A.
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