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sys_attrs_cfs(5)
NAME
sys_attrs_cfs - cfs subsystem attributes
DESCRIPTION
This reference page lists and describes attributes for the cluster file
system (cfs) kernel subsystem. Refer to the sys_attrs(5) reference page for
an introduction to the topic of kernel subsystem attributes.
cnode_hash_size
Size of the hash table used to hold CFS-type vnodes (cnodes).
Set this attribute relative to the maximum number of vnodes (files)
allowed in the system. You can learn this number with the following
command:
sysconfig -q vfs max-vnodes
Supported operations: Query; Configure at boot time
Default value: If a value is not explicitly set in /etc/sysconfigtab, a
value is calculated by dividing the value of max-vnodes by 12. If the
result is even, 1 is added to it to make cnode_hash_size odd. This is
done to improve hashing performance. The result is 12 cnodes on each
hash chain (on average). This is appropriate for most cases.
Minimum value: 64
Maximum value: 16384
blkrsrv_save_percent
The percent of total space saved for block reservation. If free space
reaches this number, all write operations are sent to the CFS server.
Supported operations: Query; Configure at boot time
Default value: 10
Minimum value: 5
Maximum value: 100
cfsdbg_place
Enables and disables the debugging of certain sections of CFS client
and server code.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 768
Minimum value: -9223372036854775808
Maximum value: 9223372036854775807
cfsdbg_flags
Specifies which code sections are to be debugged and how the debug
messages are output.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 0
Minimum value: -9223372036854775808
Maximum value: 9223372036854775807
cfslog_max_size
Maximum size of the CFS event trace log.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Default value: 81920
Minimum value: 8192
Maximum value: 1638400
cfslog_timestamp
If set to 1, prepend timestamp, command name and thread ID to messages
written to the CFS event trace log.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 1
Minimum value: -2147483648
Maximum value: 2147483647
cfsdbg_timeout
Number of seconds before a CFS thread that is hung waiting for a token
is timed out.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 4
Minimum value: -9223372036854775808
Maximum value: 9223372036854775807
cfsdbg_dopanic
When set to 1, panics this member on certain CFS failures. Otherwise,
the failures are logged to the CFS event trace log.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 0
Minimum value: -9223372036854775808
Maximum value: 9223372036854775807
cfsdbg_tokenlog
When set to 1, turns on CFS client and server token logging.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 3
Minimum value: -2147483648
Maximum value: 2147483647
cfsdbg_svrtok_size
Size in bytes of server token log.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 2000
Minimum value: -2147483648
Maximum value: 2147483647
cfsdbg_clitok_size
Size in bytes of client token log.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 1000
Minimum value: -2147483648
Maximum value: 2147483647
svrcfstok_max_percent
Percentage of memory that can be used by the token data structures on a
CFS server.
The svrcfstok_max_percent attribute sets an upper limit on the amount
of memory used by a CFS server to track vnode caching on clients.
Without this attribute, the only limit is the number of vnodes that can
be created at CFS client nodes. If the number of CFS clients is large
and a single cluster member serves many file systems, the server could
run out of memory and hang.
Supported operations: Query; Configure at boot time
Default value: 25
Minimum value: 5
Maximum value: 50
The default value is well suited for most situations. For more
information, see the TruCluster Server Administration manual.
no_sync_on_panic
On large configurations, the synchronization of file systems can take
considerable time, slowing failover. However, if no synchronization is
done, data not flushed to disk is lost if the data originated from an
application on the panicking member. Data originating from an
application on a remote, surviving member still exist on that member
and is rescheduled when a new server for the file system is selected.
The default, 0 (zero), allows writing buffers when the system panic.
When no_sync_on_panic is 1, the normal process of attempting to write
modified buffers back to disk when the system panics is disabled. File
corruption can result.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 0
Minimum value: 0
Maximum value: 1
cfstok_ctokhold_cache_limit
Maximum number of cached objects on the token hold freelist.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time
Default value: 1024
Minimum value: -2147483648
Maximum value: 2147483647
cfstok_ctok_req_cache_limit
Maximum number of cached objects on the token request freelist.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time
Default value: 512
Minimum value: -2147483648
Maximum value: 2147483647
cfstok_ctok_rev_cache_limit
Maximum number of cached objects on the token revoke freelist.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time
Default value: 256
Minimum value: -2147483648
Maximum value: 2147483647
bread
The bread attribute enables an optimization that eliminates a data copy
for NFS read requests. There should be no reason to change this
attribute from its default value.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 1
Minimum value: 0
Maximum value: 1
cfs_async_biod_threads
Controls the number of threads on the member that do read-aheads for
applications that perform sequential reads. The read aheads are
performed only on CFS clients (not the CFS server).
Setting this attribute may be useful in an environment in which
sequential read performance of large files is important. By default,
CFS reads in 64 KB chunks. A read-ahead thread is useful when a file
has multiple 64 KB chunks that are read sequentially. If there are more
than 15 such files that are being read at the same time, increasing the
value of this attribute may be useful.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 15
Minimum value: 0
Maximum value: 128
cfsiosize
The cfsiosize attribute controls the amount of data that is processed
per pass through the client side I/O code path. The value is in
kilobytes. Making cfsiosize large results in more data being proceesed
per pass. Typically, this yields better performance.
To set the I/O size for a specific file system, overriding the effect
of cfsiosize on that file system, use the cfsmgr command to set the
FSBSIZE attribute for the file system.
See cfsmgr(8) for more information.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 65536
Minimum value: 8192
Maximum value: 131072
SEE ALSO
sys_attrs(5), cfsmgr(8)
TruCluster Server Cluster Administration
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