Event Handles for fsm.exe on a Windows Metadata Server

Event Handles for fsm.exe on a Windows Metadata Server

The metadata server (FSM) has many data structures that are used internally. Each of the data structures has some locks (pthread_mutex_lock). Each lock is initialized as “uninitialized.”

The first time the lock is used, a small amount of memory and an event (i.e., handle) are allocated. The memory and event/handle are retained by the system until the data structure is destroyed. Some locks that are part of structures are seldom used, and exist for rare conditions. If the lock is not used, the memory/event for that structure will never be allocated.

Some data structures are not destroyed during the life of the FSM. These include in-memory inodes and buffers and others.

When the system starts, handle use is minimal. After the FSM has been up for a while, the handle count increases as the inode and buffer cache are used. After a while, the system stabilizes at some number of handles. This occurs after all inodes and buffers have been used.

The maximum number of used handles can be reduced by shrinking the inode and/or buffer cache. However, changing these variables could significantly reduce system performance.

FSBlockSize, Metadata Disk Size, and JournalSize Settings

The FsBlockSize (FSB), metadata disk size, and JournalSize settings all work together. For example, the FsBlockSize must be set correctly in order for the metadata sizing to be correct. JournalSize is also dependent on the FsBlockSize.

For FsBlockSize the optimal settings for both performance and space utilization are in the range of 16K or 64K.

Settings greater than 64K are not recommended because performance will be adversely impacted due to inefficient metadata I/O operations.

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Quantum 6-01658-05 manual Event Handles for fsm.exe on a Windows Metadata Server
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