The maximum number of lightweight processes (LWPs) or pthreads the File Server uses to handle requests for data; corresponds to the -p argument. The File Server always uses a minimum of 32 KB of memory for these processes.
The maximum number of directory blocks the File Server caches in memory; corresponds to the -b argument. Each cached directory block (buffer) consumes 2,092 bytes of memory.
The maximum number of large vnodes the File Server caches in memory for tracking directory elements; corresponds to the -l argument. Each large vnode consumes 292 bytes of memory.
The maximum number of small vnodes the File Server caches in memory for tracking file elements; corresponds to the -s argument. Each small vnode consumes 100 bytes of memory.
The maximum volume cache size, which determines how many volumes the File Server can cache in memory before having to retrieve data from disk; corresponds to the -vc argument.
The maximum number of callback structures the File Server caches in memory; corresponds to the -cb argument. Each callback structure consumes 16 bytes of memory.
The maximum number of Rx packets the File Server uses; corresponds to the -rxpck argument. Each packet consumes 1544 bytes of memory.
The default values are:
Parameter (Argument) Small (-S) Medium Large (-L) --------------------------------------------------------------------- Number of LWPs (-p) 6 9 128 Number of cached dir blocks (-b) 70 90 120 Number of cached large vnodes (-l) 200 400 600 Number of cached small vnodes (-s) 200 400 600 Maximum volume cache size (-vc) 200 400 600 Number of callbacks (-cb) 20,000 60,000 64,000 Number of Rx packets (-rxpck) 100 150 200
To override any of the values, provide the indicated argument (which can be combined with the -S or -L flag).
The amount of memory required for the File Server varies. The approximate default memory usage is 751 KB when the -S flag is used (small configuration), 1.1 MB when all defaults are used (medium configuration), and 1.4 MB when the -L flag is used (large configuration). If additional memory is available, increasing the value of the -cb and -vc arguments can improve File Server performance most directly.
By default, the File Server allows a volume to exceed its quota by 1 MB when an application is writing data to an existing file in a volume that is full. The File Server still does not allow users to create new files in a full volume. To change the default, use one of the following arguments:
Set the -spare argument to the number of extra kilobytes that the File Server allows as overage. A value of
0 allows no overage.
Set the -pctspare argument to the percentage of the volume's quota the File Server allows as overage.
By default, the File Server implicitly grants the
a (administer) and
l (lookup) permissions to system:administrators on the access control list (ACL) of every directory in the volumes stored on its file server machine. In other words, the group's members can exercise those two permissions even when an entry for the group does not appear on an ACL. To change the set of default permissions, use the -implicit argument.
The File Server maintains a host current protection subgroup (host CPS) for each client machine from which it has received a data access request. Like the CPS for a user, a host CPS lists all of the Protection Database groups to which the machine belongs, and the File Server compares the host CPS to a directory's ACL to determine in what manner users on the machine are authorized to access the directory's contents. When the pts adduser or pts removeuser command is used to change the groups to which a machine belongs, the File Server must recompute the machine's host CPS in order to notice the change. By default, the File Server contacts the Protection Server every two hours to recompute host CPSs, implying that it can take that long for changed group memberships to become effective. To change this frequency, use the -hr argument.
The File Server stores volumes in partitions. A partition is a filesystem or directory on the server machine that is named
/vicepXX where XX is "a" through "z" or "aa" though "iv". Up to 255 partitions are allowed. The File Server expects that the /vicepXX directories are each on a dedicated filesystem. The File Server will only use a /vicepXX if it's a mountpoint for another filesystem, unless the file
/vicepXX/AlwaysAttach exists. A partition will not be mounted if the file
/vicepXX/NeverAttach exists. If both
/vicepXX/NeverAttach are present, then
/vicepXX/AlwaysAttach wins. The data in the partition is a special format that can only be access using OpenAFS commands or an OpenAFS client.
The File Server generates the following message when a partition is nearly full:
No space left on device
This command does not use the syntax conventions of the AFS command suites. Provide the command name and all option names in full.