--- /dev/null
+Overview
+--------
+
+This survey script generates meta-data load on the MDS with varying
+numbers of threads by using the echo_client to drive different layers
+of the MDS stack: mdd,mdt, and osd. Currently, we only support mdd layer.
+
+It can be used with the following classes of operations
+
+1. Open-create/mkdir/create
+2. Lookup/getattr/setxattr
+3. Delete/destroy
+4. Unlink/rmdir
+
+ These operations will be run by a variable number of concurrent
+ threads and will test with the number of directories specified by the user.
+ The run can be executed such that all threads operate in a single
+ directory (dir_count=1) or in private/unique directory
+ (dir_count=x thrlo=x thrhi=x).
+
+ The mdd instance is driven directly. The script automatically
+ loads the obdecho module if required and creates instance of
+ echo_client.
+
+ This script can also create OST objects by providing
+ stripe_count greater than zero.
+
+Running
+-------
+
+The script must be customised according to the components under test and
+where it should keep its working files. Customization variables are
+described as followed:
+
+thrlo threads to start testing. skipped if less than dir_count
+thrhi maximum number of threads to test
+targets MDT instance
+file_count total number of files to test
+dir_count total number of directories to test
+stripe_count number stripe on OST objects
+tests_str test operations. Must have at least "create" and "destroy"
+start_number base number for each thread to prevent name collisions
+
+- Create a Lustre configuraton using your normal methods
+
+1. Run without OST objects creation:
+Setup the Lustre MDS without OST mounted.
+Then invoke the mds-survey script
+e.g. : $ thrhi=64 file_count=200000 sh mds-survey
+
+2. Run with OST objects creation:
+Setup the Lustre MDS with at least one OST mounted.
+Then invoke the mds-survey script with stripe_count parameter
+e.g. : $ thrhi=64 file_count=200000 stripe_count=2 sh mds-survey
+
+Note: a specific mdt instance can be specified using targets variable.
+e.g. : $ targets=lustre-MDT0000 thrhi=64 file_count=200000 stripe_count=2 sh mds-survey
+
+Output files:
+-------------
+
+When the script runs, it creates a number of working files and a pair of
+result files. All files start with the prefix given by ${rslt}.
+
+${rslt}.summary same as stdout
+${rslt}.script_* per-host test script files
+${rslt}.detail_tmp* per-mdt result files
+${rslt}.detail collected result files for post-mortem
+
+The script iterates over the given numbers of threads performing
+all the specified tests and checking that all test processes
+completed successfully.
+
+Note that the script may not clean up properly if it is aborted or if it
+encounters an unrecoverable error. In this case, manual cleanup may be
+required, possibly including killing any running instances of 'lctl' (local
+or remote), removing echo_client instances created by the script and
+unloading obdecho.
+
+
+Script output
+-------------
+
+The summary file and stdout contain lines like...
+
+mdt 1 file 100000 dir 4 thr 4 create 5652.05 [ 999.01,46940.48] destroy 5797.79 [ 0.00,52951.55]
+
+mdt 1 is the total number of MDTs under test.
+file 100000 is the total number of files to operate
+dir 4 is the total number of directories to operate
+thr 4 is the total number of threads operate over all directories
+create
+destroy are the test name. More tests will be displayed on the same line.
+565.05 is the aggregate operations over all MDTs measured by
+ dividing the total number of operations by the elapsed time.
+[999.01,46940.48] are the minimum and maximum instantaneous operation seen on
+ any individual MDT.
git://git.whamcloud.com / fs / lustre-release.git / blobdiff