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Meta-data operations from a single client node B–13

B.9 Meta-data operations from a single client node

Figure B-11 shows the numbers of meta-data operations that are possible to a Lustre file system from a single

client node.

Figure B-11 Meta-data operations from a single client node.

The results shown in Figure B-11are based on the following configuration:

• File system with one OST service (that is, a file stripe of one) on a system using SFS20 storage

• Mirrored MDS service

The four tests were performed with an aggregate population of three million files, distributed as follows in

the tests:

• 30 directories, each containing 100,000 files

• 6 directories, each containing 500,000 files

• 3 directories, each containing 1 million files

• 2 directories, each containing 1.5 million files

• A single directory containing 3 million files

The results demonstrate that there is a correlation between the directory population and the aggregate

number of operations possible—that is, the smaller the individual directory population, the higher the

aggregate number of operations possible.

Note the following points:

• mknod() operations are faster than creat() operations because mknod() operations do not

require activity at the Object Storage Servers (whereas creat() operations create objects on the

OST service); mknod() operations represent the high-water mark of I/O operations.

• The rate at which files created by mknod() operations and files created by creat() operations can

be removed by the unlink() operation is also shown. This represents the high-water mark for file

removal; rates obtainable with the rm -rf command can be lower than this. Refer to Chapter 6 of

1000

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7000

Operations/sec

100000 500000 1 million 1.5 million 3 million

Directory Populations

HP SFS Meta-data Operations (3M files)

mknods

unlinks (mknod)

creats

unlinks (creat)

stats

1 2 ... 336 337 338 339 340 341 342 343 344 345 346 ... 361 362

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Hp StorageWorks Scalable File Share Manual de usuario Pagina 341