SALVAGESERVER(8) AFS Command Reference SALVAGESERVER(8)NAMEsalvageserver - Initializes the Salvageserver component of the dafs
process
SYNOPSISsalvageserver [initcmd] [-partition <name of partition to salvage>]
[-volumeid <volume id to salvage>] [-debug] [-nowrite]
[-inodes] [-force] [-oktozap] [-rootinodes]
[-salvagedirs] [-blockreads]
[-parallel <# of max parallel partition salvaging>]
[-tmpdir <name of dir to place tmp files>]
[-showlog] [-showsuid] [-showmounts]
[-orphans (ignore | remove | attach)]
[-client] [-help]
DESCRIPTION
In its typical mode of operation, the salvageserver is a daemon process
responsible for salvaging volumes. It is a component of the "dafs"
process type. In the conventional configuration, its binary file is
located in the /usr/afs/bin directory on a file server machine.
The Salvageserver daemon is responsible for scheduling and executing
volume salvage operations on behalf of client processes. The
fileserver acts as the primary salvageserver client: any failed volume
attach operation results in a salvageserver scheduling request. The
salvageserver also accepts periodic volume activity messages in order
to update its salvage request priority queue. Other clients of the
salvageserver daemon include the salvsync-debug utility, and the
salvageserver command itself by passing the -client flag.
The salvage operations performed on vice partition data are nearly
identical to those performed by the standalone Salvager command. The
key differences between the two commands are:
· The Salvageserver is a daemon process which runs concurrently with
the fileserver. In contrast, the Salvager is a stand-alone
application which is invoked when the fileserver and volserver are
not running.
· The Salvageserver is incapable of performing whole partition
salvage operations; it operates at volume group granularity.
The Salvageserver normally creates new inodes as it repairs damage. If
the partition is so full that there is no room for new inodes, use the
-nowrite argument to bringing undamaged volumes online without
attempting to salvage damaged volumes. Then use the vos move command to
move one or more of the undamaged volumes to other partitions, freeing
up the space that the Salvageserver needs to create new inodes.
By default, multiple Salvageserver subprocesses run in parallel: one
for each volume group. By default, four concurrent salvage operations
are permitted. You may alter this default by providing a positive
integer value for the -parallel argument. The maximum permitted value
is 32 concurrent salvageserver subprocesses.
By default, the salvageserver enables a heuristic which attempts to
stop disk head thrashing by concurrent salvageserver subprocesses.
Unfortunately, this heuristic significantly degrades performance in
many cases. In at least the following environments, passing the "all"
string to the -parallel argument is strongly encouraged:
· On NAMEI fileservers
· When a vice partition is backed by multiple disks (e.g. RAID)
· When a vice partition is backed by SAN-attached storage, LVM, or
some other form of storage virtualization which would cause unix
device id numbers to be unpredictable.
The Salvageserver creates temporary files as it runs, by default
writing them to the partition it is salvaging. The number of files can
be quite large, and if the partition is too full to accommodate them,
the Salvageserver terminates without completing the salvage operation
(it always removes the temporary files before exiting). Other
Salvageserver subprocesses running at the same time continue until they
finish salvaging all other partitions where there is enough disk space
for temporary files. To complete the interrupted salvage, reissue the
command against the appropriate partitions, adding the -tmpdir argument
to redirect the temporary files to a local disk directory that has
enough space.
The -orphans argument controls how the Salvageserver handles orphaned
files and directories that it finds on server partitions it is
salvaging. An orphaned element is completely inaccessible because it is
not referenced by the vnode of any directory that can act as its parent
(is higher in the filespace). Orphaned objects occupy space on the
server partition, but do not count against the volume's quota.
To generate a list of all mount points that reside in one or more
volumes, rather than actually salvaging them, include the -showmounts
flag.
This command does not use the syntax conventions of the AFS command
suites. Provide the command name and all option names in full.
OPTIONS
[initcmd]
Accommodates the command's use of the AFS command parser, and is
optional.
-partition <name of partition to salvage>
Specifies the name of the partition to salvage. Specify the full
partition name using the form /vicepx or /vicepxx. Omit this
argument to salvage every partition on the file server machine.
-volumeid <volume id to salvage>
Specifies the volume ID of a specific read/write volume to salvage.
The -partition argument must be provided along with this one and
specify the volume's actual site.
-debug
This flag should be considered deprecated. Its primary purpose was
to disable forking and parallelization of the Salvager so that log
messages were not interleaved. Due to the manner in which
/usr/afs/logs/SalSrvLog is written, log messages from subprocesses
are never interleaved; the entire log for a volume group salvage is
appended to the master log as one atomic transaction.
-nowrite
Brings all undamaged volumes online without attempting to salvage
any damaged volumes.
-inodes
Records in the /usr/afs/logs/SalSrvLog file a list of all AFS
inodes that the Salvageserver modified.
-force
Inspects all volumes for corruption, not just those that are marked
as having been active when a crash occurred.
-oktozap
Removes a volume that is so damaged that even issuing the vos zap
command with the -force flag is ineffective. Combine it with the
-partition and -volumeid arguments to identify the volume to
remove. Using this flag will destroy data that cannot be read, so
use only with caution and when you're certain that nothing in that
volume is still needed.
-rootinodes
Records in the /usr/afs/logs/SalSrvLog file a list of all AFS
inodes owned by the local superuser "root".
-salvagedirs
Salvages entire directory structures, even if they do not appear to
be damaged. By default, the Salvageserver salvages a directory only
if it is flagged as corrupted.
-blockreads
Forces the Salvageserver to read a partition one disk block (512
bytes) at a time and to skip any blocks that are too badly damaged
to be salvaged. This allows it to salvage as many volumes as
possible. By default, the Salvageserver reads large disk blocks,
which can cause it to exit prematurely if it encounters disk
errors. Use this flag if the partition to be salvaged has disk
errors.
-parallel <# of max parallel partition salvaging>
Specifies the maximum number of Salvageserver subprocesses to run
in parallel. Provide one of three values:
· An integer from the range 1 to 32. A value of 1 means that a
single Salvageserver subprocess salvages the volume groups
sequentially. The disk partition heuristic (see above) based
upon unix device ids is enabled.
· The disk partition heuristic (see above) based upon unix device
ids is disabled.
· The string "all" followed immediately (with no intervening
space) by an integer from the range 1 to 32, to run the
specified number of Salvageserver subprocesses in parallel on
volume groups. The disk partition heuristic (see above) based
upon unix device ids is disabled.
If this argument is omitted, up to four Salvageserver subprocesses
run in parallel.
-tmpdir <name of dir to place tmp files>
Names a local disk directory in which the Salvageserver places the
temporary files it creates during a salvage operation, instead of
writing them to the partition being salvaged (the default). If the
Salvageserver cannot write to the specified directory, it attempts
to write to the partition being salvaged.
-showlog
Displays on the standard output stream all log data that is being
written to the /usr/afs/logs/SalSrvLog file.
-showsuid
Displays a list of the pathnames for all files that have the setuid
or setgid mode bit set.
-showmounts
Records in the /usr/afs/logs/SalSrvLog file all mount points found
in each volume. The Salvageserver does not repair corruption in the
volumes, if any exists.
-orphans (ignore | remove | attach)
Controls how the Salvageserver handles orphaned files and
directories. Choose one of the following three values:
ignore
Leaves the orphaned objects on the disk, but prints a message
to the /usr/afs/logs/SalSrvLog file reporting how many orphans
were found and the approximate number of kilobytes they are
consuming. This is the default if the -orphans argument is
omitted.
remove
Removes the orphaned objects, and prints a message to the
/usr/afs/logs/SalSrvLog file reporting how many orphans were
removed and the approximate number of kilobytes they were
consuming.
attach
Attaches the orphaned objects by creating a reference to them
in the vnode of the volume's root directory. Since each
object's actual name is now lost, the Salvageserver assigns
each one a name of the following form:
"__ORPHANFILE__.index" for files.
"__ORPHANDIR__.index" for directories.
where index is a two-digit number that uniquely identifies each
object. The orphans are charged against the volume's quota and
appear in the output of the ls command issued against the
volume's root directory.
-client
Salvageserver runs in client Mode. The requested volume on the
requested partition will be scheduled for salvaging by the
Salvageserver daemon.
-help
Prints the online help for this command. All other valid options
are ignored.
EXAMPLES
The following command instructs the Salvageserver to schedule the
salvage of the volume with volume ID 258347486 on /vicepg on the local
machine.
% /usr/afs/bin/salvageserver -partition /vicepg -volumeid 258347486 -client
PRIVILEGE REQUIRED
To issue the command at the shell prompt, the issuer must be logged in
as the local superuser "root".
SEE ALSOBosConfig(5), SalvageLog(5), Salvager(8), bos_create(8), bos_getlog(8),
bos_salvage(8), vos_move(1)COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved. Sine
Nomine Associates 2008. All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0.
It was converted from HTML to POD by software written by Chas Williams
and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
This document was adapted from the Salvager POD documentation.
OpenAFS 2013-10-09 SALVAGESERVER(8)
