FSCONFIG(8) FSCONFIG(8) NAME fsconfig - configuring a file server SYNOPSIS service name config device filsys name device ream name recover name ip ipaddr ipgw ipaddr ipmask ipaddr ipauth ipaddr end DESCRIPTION When a file server's configuration has not been set, or by explicit request early in the server's initialization (see fs(8)), the server enters `config mode'. The commands described here apply only in that mode. They establish con- figuration constants that are typically valid for the life of the server, and therefore need be run only once. If the non-volatile RAM on the server gets erased, it will be nec- essary to recreate the configuration. In these commands, ipaddr is an IP address in the form 220.127.116.11 and name is a text string without white space. The syntax of a device is more complicated: wn1.n2.n3 A SCSI disk on target id n2, unit n1, and partition n3. A single number specifies a unit, while two numbers specify unit.partition, with the missing numbers defaulting to zero. Any one of the numbers may be replaced by <m-n> to represent the values m through n inclusive. For example, (w<1-4>) is the concatenation of SCSI targets 1 through 4. rn1.n2.n3 A SCSI WORM disk on unit n1, target n2, and partition n3. The values are as in w. FSCONFIG(8) FSCONFIG(8) (device...) A pseudo-device formed from the concatenation of the devices in the list. The devices are not blank- or comma-separated. [device...] A pseudo-device formed from the block-wise interleaving of the devices in the list. The size of the result is the number of devices times the size of the smallest device. pdevice.n1.n2 A partition starting at n1% from the beginning of device with a length n2% of the size of the device. Parenthesize device if it contains periods. fdevice A pseudo-WORM disk: blocks on device can be written only once and may not be read unless written. cdevice1device2 A cached WORM. The first device is the cache, the sec- ond the WORM. o (Letter o) The read-only (dump) file system of the pre- viously defined cached WORM file system. The service command sets the textual name of the server as known in the network databases. The configuration information is stored in block zero on a device whose device string is written in non-volatile RAM. The config command identifies the device on which the infor- mation is recorded. The filsys command configures a file system on device and calls it name. Name is used as the specifier in attach mes- sages to connect to that file system. (The file system is the one attached to if the specifier is null; see attach(5)). The ream command initializes the named file system. It overwrites any previous file system on the same device and creates an empty root directory on the device. If name is main, the file server, until the next reboot, will accept wstat messages (see stat(5)) that change the owner and group of files, to enable initializing a fresh file system from a mkfs(8) archive. For the recover command, the named file system must be a cached WORM. Recover clears the associated magnetic cache and initializes the file system, effectively resetting its FSCONFIG(8) FSCONFIG(8) contents to the last dump. The rest of the commands record IP addresses: the file server's address (ip), the local gateway's (ipgw), the local authentication server's (ipauth), and the local subnet mask (ipmask). Ipauth should be 0.0.0.0 if the system is doing its own authentication rather than calling an external authentication server. The various configuration commands only record what to do; they write no data to disk. The command end exits config mode and begins running the file server proper. The server will then perform whatever I/O is required to establish the configuration. EXAMPLE Initialize a file server kgbsun with a single file system interleaved between SCSI targets 3 and 4. service kgbsun config w3 filsys main [w<3-4>] ream main Initialize a file server kremvax with a single disk on tar- get 0 partitioned as a cached pseudo-WORM file system with the cache on the third quarter of the drive and the pseudo- WORM on the interleave of the first, second, and fourth quarters. service kremvax config p(w0)50.1 filsys main cp(w0)50.25f[p(w0)0.25p(w0)25.25p(w0)75.25] filsys dump o ream main SOURCE /sys/src/fs/port/config.c SEE ALSO Ken Thompson, ``The Plan 9 File Server''.