1. RESTful Edit Management Interface for Oracle WebLogic Server
  2. Tasks
  3. Default File Store
  4. Server Templates
  5. Default File Store

Modify This Default File Store

post

/management/weblogic/{version}/edit/serverTemplates/{name}/defaultFileStore

Modify this default file store.

Request

Supported Media Types
Path Parameters
Header Parameters
  • The 'X-Requested-By' header is used to protect against Cross-Site Request Forgery (CSRF) attacks. The value is an arbitrary name such as 'MyClient'.
Body ()

Must contain the modified default file store model.

Root Schema : Default File Store
Type: object
Show Source
  • Minimum Value: -1
    Maximum Value: 8192
    Default Value: -1

    The smallest addressable block, in bytes, of a file. When a native wlfileio driver is available and the block size has not been configured by the user, the store selects the minimum OS specific value for unbuffered (direct) I/O, if it is within the range [512, 8192].

    A file store's block size does not change once the file store creates its files. Changes to block size only take effect for new file stores or after the current files have been deleted. See "Tuning the Persistent Store" in Tuning Performance of Oracle WebLogic Server

  • Default Value: oracle.doceng.json.BetterJsonNull@75723fe1

    The location of the cache directory for Direct-Write-With-Cache, ignored for other policies.

    When Direct-Write-With-Cache is specified as the SynchronousWritePolicy, cache files are created in addition to primary files (see Directory for the location of primary files). If a cache directory location is specified, the cache file path is CacheDirectory/WLStoreCache/StoreNameFileNum.DAT.cache. When specified, Oracle recommends using absolute paths, but if the directory location is a relative path, then CacheDirectory is created relative to the WebLogic Server instance's home directory. If "" or Null is specified, the Cache Directory is located in the current operating system temp directory as determined by the java.io.tmpdir Java System property (JDK's default: /tmp on UNIX, %TEMP% on Windows) and is TempDirectory/WLStoreCache/DomainNameunique-idStoreNameFileNum.DAT.cache. The value of java.io.tmpdir varies between operating systems and configurations, and can be overridden by passing -Djava.io.tmpdir=My_path on the JVM command line.

    Considerations:

    • Security: Some users may want to set specific directory permissions to limit access to the cache directory, especially if there are custom configured user access limitations on the primary directory. For a complete guide to WebLogic security, see "Securing a Production Environment for Oracle WebLogic Server."

    • Additional Disk Space Usage: Cache files consume the same amount of disk space as the primary store files that they mirror. See Directory for the location of primary store files.

    • Performance: For the best performance, a cache directory should be located in local storage instead of NAS/SAN (remote) storage, preferably in the operating system's temp directory. Relative paths should be avoided, as relative paths are located based on the domain installation, which is typically on remote storage. It is safe to delete a cache directory while the store is not running, but this may slow down the next store boot.

    • Preventing Corruption and File Locking: Two same named stores must not be configured to share the same primary or cache directory. There are store file locking checks that are designed to detect such conflicts and prevent corruption by failing the store boot, but it is not recommended to depend on the file locking feature for correctness. See Enable File Locking

    • Boot Recovery: Cache files are reused to speed up the File Store boot and recovery process, but only if the store's host WebLogic Server instance has been shut down cleanly prior to the current boot. For example, cache files are not re-used and are instead fully recreated: after a kill -9, after an OS or JVM crash, or after an off-line change to the primary files, such as a store admin compaction. When cache files are recreated, a Warning log message 280102 is generated.

    • Fail-Over/Migration Recovery: A file store safely recovers its data without its cache directory. Therefore, a cache directory does not need to be copied or otherwise made accessible after a fail-over or migration, and similarly does not need to be placed in NAS/SAN storage. A Warning log message 280102, which is generated to indicate the need to recreate the cache on the new host system, can be ignored.

    • Cache File Cleanup: To prevent unused cache files from consuming disk space, test and developer environments should periodically delete cache files.

    Constraints

    • legal null
  • Default Value: oracle.doceng.json.BetterJsonNull@301f5aaf

    The path name to the file system directory where the file store maintains its data files.

    • When targeting a file store to a migratable target, the store directory must be accessible from all candidate server members in the migratable target.

    • For highest availability, use either a SAN (Storage Area Network) or other reliable shared storage.

    • Use of NFS mounts is discouraged, but supported. Most NFS mounts are not transactionally safe by default, and, to ensure transactional correctness, need to be configured using your NFS vendor documentation in order to honor synchronous write requests.

    • For SynchronousWritePolicy of Direct-Write-With-Cache, see Cache Directory.

    • Additional O/S tuning may be required if the directory is hosted by Microsoft Windows, see Synchronous Write Policy for details.

    Constraints

    • legal null
  • Read Only: true
    Default Value: false

    Return whether the MBean was created dynamically or is persisted to config.xml

  • Default Value: true

    Determines whether OS file locking is used.

    When file locking protection is enabled, a store boot fails if another store instance already has opened the store files. Do not disable this setting unless you have procedures in place to prevent multiple store instances from opening the same file. File locking is not required but helps prevent corruption in the event that two same-named file store instances attempt to operate in the same directories. This setting applies to both primary and cache files.

  • Read Only: true

    Return the unique id of this MBean instance

  • Minimum Value: 0
    Default Value: 0

    The initial file size, in bytes.

    • Set InitialSize to pre-allocate file space during a file store boot. If InitialSize exceeds MaxFileSize, a store creates multiple files (number of files = InitialSizeMaxFileSize rounded up).

    • A file store automatically reuses the space from deleted records and automatically expands a file if there is not enough space for a new write request.

    • Use InitialSize to limit or prevent file expansions during runtime, as file expansion introduces temporary latencies that may be noticeable under rare circumstances.

    • Changes to initial size only take effect for new file stores, or after any current files have been deleted prior to restart.

    • See Maximum File Size

  • Minimum Value: -1
    Maximum Value: 67108864
    Default Value: -1

    The I/O buffer size, in bytes, automatically rounded down to the nearest power of 2.

    • For the Direct-Write-With-Cache policy when a native wlfileio driver is available, IOBufferSize describes the maximum portion of a cache view that is passed to a system call. This portion does not consume off-heap (native) or Java heap memory.

    • For the Direct-Write and Cache-Flush policies, IOBufferSize is the size of a per store buffer which consumes off-heap (native) memory, where one buffer is allocated during run-time, but multiple buffers may be temporarily created during boot recovery.

    • When a native wlfileio driver is not available, the setting applies to off-heap (native) memory for all policies (including Disabled).

    • For the best runtime performance, Oracle recommends setting IOBufferSize so that it is larger than the largest write (multiple concurrent store requests may be combined into a single write).

    • For the best boot recovery time performance of large stores, Oracle recommends setting IOBufferSize to at least 2 megabytes.

    See AllocatedIOBufferBytes to find out the actual allocated off-heap (native) memory amount. It is a multiple of IOBufferSize for the Direct-Write and Cache-Flush policies, or zero.

  • Minimum Value: 1048576
    Maximum Value: 2139095040
    Default Value: 1342177280

    The maximum file size, in bytes, of an individual data file.

    • The MaxFileSize value affects the number of files needed to accommodate a store of a particular size (number of files = store size/MaxFileSize rounded up).

    • A file store automatically reuses space freed by deleted records and automatically expands individual files up to MaxFileSize if there is not enough space for a new record. If there is no space left in exiting files for a new record, a store creates an additional file.

    • A small number of larger files is normally preferred over a large number of smaller files as each file allocates Window Buffer and file handles.

    • If MaxFileSize is larger than 2^24 * BlockSize, then MaxFileSize is ignored, and the value becomes 2^24 * BlockSize. The default BlockSize is 512, and 2^24 * 512 is 8 GB.

    • The minimum size for MaxFileSize is 10 MB when multiple data files are used by the store. If InitialSize is less than MaxFileSize then a single file will be created of InitialSize bytes. If InitialSize is larger than MaxFileSize then (InitialSize / MaxFileSize) files will be created of MaxFileSize bytes and an additional file if necessary to contain any remainder.

    • See Initial Size

  • Minimum Value: -1
    Maximum Value: 1073741824
    Default Value: -1

    The maximum amount of data, in bytes and rounded down to the nearest power of 2, mapped into the JVM's address space per primary store file. Applies to synchronous write policies Direct-Write-With-Cache and Disabled but only when the native wlfileio library is loaded.

    A window buffer does not consume Java heap memory, but does consume off-heap (native) memory. If the store is unable to allocate the requested buffer size, it allocates smaller and smaller buffers until it reaches MinWindowBufferSize, and then fails if cannot honor MinWindowBufferSize

    Oracle recommends setting the max window buffer size to more than double the size of the largest write (multiple concurrently updated records may be combined into a single write), and greater than or equal to the file size, unless there are other constraints. 32-bit JVMs may impose a total limit of between 2 and 4GB for combined Java heap plus off-heap (native) memory usage.

    • See store attribute AllocatedWindowBufferBytes to find out the actual allocated Window Buffer Size.

    • See Maximum File Size and Minimum Window Buffer Size

  • Minimum Value: -1
    Maximum Value: 1073741824
    Default Value: -1

    The minimum amount of data, in bytes and rounded down to the nearest power of 2, mapped into the JVM's address space per primary store file. Applies to synchronous write policies Direct-Write-With-Cache and Disabled, but only when a native wlfileio library is loaded. See Maximum Window Buffer Size

  • Read Only: true

    The user-specified name of this MBean instance.

    This name is included as one of the key properties in the MBean's javax.management.ObjectName

    Name=user-specified-name

    Constraints

    • legal null

  • Optional information that you can include to describe this configuration.

    WebLogic Server saves this note in the domain's configuration file (config.xml) as XML PCDATA. All left angle brackets (<) are converted to the xml entity <. Carriage returns/line feeds are preserved.

    Note: If you create or edit a note from the Administration Console, the Administration Console does not preserve carriage returns/line feeds.

  • Default Value: Direct-Write
    Allowed Values: [ "Disabled", "Cache-Flush", "Direct-Write", "Direct-Write-With-Cache" ]

    The disk write policy that determines how the file store writes data to disk.

    This policy also affects the JMS file store's performance, scalability, and reliability. Oracle recommends Direct-Write-With-Cache which tends to have the highest performance. The default value is Direct-Write. The valid policy options are:

    • Direct-Write Direct I/O is supported on all platforms. When available, file stores in direct I/O mode automatically load the native I/O wlfileio driver. This option tends to out-perform Cache-Flush and tend to be slower than Direct-Write-With-Cache. This mode does not require a native store wlfileio driver, but performs faster when they are available.

    • Direct-Write-With-Cache Store records are written synchronously to primary files in the directory specified by the Directory attribute and asynchronously to a corresponding cache file in the Cache Directory. The Cache Directory provides information about disk space, locking, security, and performance implications. This mode requires a native store wlfileiocode driver. If the native driver cannot be loaded, then the write mode automatically switches to Direct-Write. See Cache Directory

    • Cache-Flush Transactions cannot complete until all of their writes have been flushed down to disk. This policy is reliable and scales well as the number of simultaneous users increases.Transactionally safe but tends to be a lower performer than direct-write policies.

    • Disabled Transactions are complete as soon as their writes are cached in memory, instead of waiting for the writes to successfully reach the disk. This is the fastest policy because write requests do not block waiting to be synchronized to disk, but, unlike other policies, is not transactionally safe in the event of operating system or hardware failures. Such failures can lead to duplicate or lost data/messages. This option does not require native store wlfileio drivers, but may run faster when they are available. Some non-WebLogic JMS vendors default to a policy that is equivalent to Disabled

    Notes:

    • When available, file stores load WebLogic wlfileio native drivers, which can improve performance. These drivers are included with Windows, Solaris, Linux, and AIX WebLogic installations.

    • Certain older versions of Microsoft Windows may incorrectly report storage device synchronous write completion if the Windows default Write Cache Enabled setting is used. This violates the transactional semantics of transactional products (not specific to Oracle), including file stores configured with a Direct-Write (default) or Direct-Write-With-Cache policy, as a system crash or power failure can lead to a loss or a duplication of records/messages. One of the visible symptoms is that this problem may manifest itself in high persistent message/transaction throughput exceeding the physical capabilities of your storage device. You can address the problem by applying a Microsoft supplied patch, disabling the Windows Write Cache Enabled setting, or by using a power-protected storage device. See http://support.microsoft.com/kb/281672 and http://support.microsoft.com/kb/332023.

    • NFS storage note: On some operating systems, native driver memory-mapping is incompatible with NFS when files are locked. Stores with synchronous write policies Direct-Write-With-Cache or Disabled, and WebLogic JMS paging stores enhance performance by using the native wlfileio driver to perform memory-map operating system calls. When a store detects an incompatibility between NFS, file locking, and memory mapping, it automatically downgrades to conventional read/write system calls instead of memory mapping. For best performance, Oracle recommends investigating alternative NFS client drivers, configuring a non-NFS storage location, or in controlled environments and at your own risk, disabling the file locks (See Enable File Locking). For more information, see "Tuning the WebLogic Persistent Store" in Tuning Performance of Oracle WebLogic Server

  • Items
    Title: Items

    Return all tags on this Configuration MBean

  • Read Only: true

    Returns the type of the MBean.

    Constraints

    • unharvestable
Nested Schema : Items
Type: array
Title: Items

Return all tags on this Configuration MBean

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Security
  • Type: basic
    Description: A user in the Admin security role.
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Response

200 Response

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