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GFPCOPY(1) Gfarm GFPCOPY(1)

NAME

gfpcopy - copy Gfarm files in parallel

SYNOPSIS

gfpcopy [-nqvdpPU] [-X regexp] [-S source-domainname] [-h source-hostfile] [-D destination-domainname] [-H destination-hostfile] [-j num-of-processes] [-J num-of-processes] [-M limit-byte] [-z minimum-byte] [-Z maximum-byte] [-w way-of-scheduling] [-W kilobytes-for-threshold] [-s KB/s-to-simulate] [-F num-for-readahead] [-b bufsize] [-f] [-e] [-k] source-path destination-path

DESCRIPTION

gfpcopy copies files in parallel.

When the source-path is a directory, files under the directory will be copied recursively.

When the destination-path does not exist, the directory is created. When the destination-path exists, a directory of the same name as the source-path is created under the destination-path.

A set of source/destination hosts can be specified by a domain name and/or a hostlist file. When both a domain name and a hostlist file are specified, a set of hosts is determined by both conditions. When a set of source hosts is specified, only files stored on the source hosts are copied.

gfpcopy also retrieves the directory entries in parallel.

SOURCE PATH

source-path must be one of the following formats. Files on HPSS cannot be copied.

path-name

is a relative path or an absolute path of a local file system. When the path is a mount point on gfarm2fs, files are copied without passing through the gfarm2fs.

gfarm:...

is a Gfarm URL.

file:...

is an URL of a local file system.

DESTINATION PATH

destination-path must be one of the following formats.

path-name

is a relative path or an absolute path of a local file system. When the path is a mount point on gfarm2fs, files are copied without passing through the gfarm2fs.

gfarm:...

is a Gfarm URL of a directory.

file:...

is an URL of a directory on a local file system.

hpss:...

is an URL of a directory on HPSS. If the same directory as the source-path exists under this directory, the source-path cannot be copied. The differential copy is not supported for HPSS. Relative path such as "hpss:". and "hpss:dir" can be specified.

GFPCOPY OPTIONS

These are options only for gfpcopy.

-b bufsize

Specifies the buffer size in bytes to copy.

The default value is 64 KiB (64 * 1024).

-f

With the -f option, existing files will be overwritten when the size is different or the modification time (mtime) is different from the source file.

Without the -f option, existing files will be overwritten when they are older than the corresponding source files in the modification time.

-e

Skips existing files in order to execute gfpcopy simultaneously.

-k

Does not copy symbolic links.

COMMON OPTIONS

The following options are common options for gfprep and gfpcopy.

-X regexp

Skips files matched by the pattern of regexp. When multiple patterns need to be specified, specify -X options multiple times.

-S source-domainname

Creates file replicas or copies files only stored on the hosts in the specified domain name.

-h source-hostfile

Creates file replicas or copies files only stored on the hosts listed in the specified hostfile. The source-hostfile consists of a file system node name on each line.

If ``-'' is specified, standard input is used to read the host list.

-L

Creates file replicas or copies files from the hosts specified by the -S or -h option.

-D destination-domainname

Specifies the domain name for destination.

If neither this nor the -H option is specified, replicas may be copied to any available host.

-H destination-hostfile

Specifies a file which describes hostnames for destination. The destination-hostfile consists of a file system node name on each line.

If ``-'' is specified, standard input is used to read the host list.

-j num-of-processes

Specifies the maximum number of processes to create file replicas (or copy files) simultaneously.

The default value is the parameter of client_parallel_copy in gfarm2.conf. (see man gfarm2.conf)

The maximum number of process per file system node for source or destination is the number of CPUs (see man gfhost).

-J num-of-processes

Specifies the number of processes to retrieve directory entries in parallel.

The default value is 8.

-M total-byte

Specifies the total file size in bytes to replicate or copy. This option is useful to increase the available capacity by moving the specified bytes of files.

The default value is unlimited.

-z minimum-byte

Specifies the minimum file size in bytes to replicate or copy. This option is useful not to replicate or copy small files.

The default value is unlimited.

-Z maximum-byte

Specifies the maximum file size in bytes to replicate or copy. This option is useful not to replicate or copy large files.

The default value is unlimited.

-w way-of-scheduling

Specifies a scheduling method. ``noplan'' replicates/copies while finding files. ``greedy'' schedules greedily the order of replication/copy beforehand.

The default behavior is ``noplan''.

``greedy'' scheduling cannot use with the -N option and -m option.

-W kibibytes

Specifies a threshold size/cost(KiB) to flat costs of Connections. A Connection means a scheduling information to assign files per a child-process

This option is effective with -w greedy.

The default value is 50*1024 KiB (50 MiB).

-I sec-to-update

Specifies the interval in seconds to collect load average and available capacity.

Default is 300 seconds.

-B

Gfarm 2.6.16 or later does not select high loaded file system nodes. This option disables this feature.

High loaded node is defined by having more CPU load than schedule_busy_load_thresh * number of CPUs. For details of schedule_busy_load_thresh, refer to a manual page of gfarm2.conf.

-U

Disables checking the available disk space of the selected node every time.

-F num-of-dirents

Specifies the number of readahead entries to retrieve the directory entries.

The default value is 10000.

-s kilobytes-per-second

Specifies a throughput(KB/s) to simulate the replication/copy, and does nothing (gets file information only).

-n

Does nothing.

-p

Reports the total performance information.

-P

Reports the performance information for each file and all files.

-q

Suppresses non-error messages.

-v

Displays verbose output.

-d

Displays debug output.

-?

Displays a list of command options.

EXAMPLES

To copy files under the directory recursively.

$ gfpcopy gfarm:///dir file:///tmp/dir

$ gfpcopy file:///tmp/dir gfarm:///dir

$ gfpcopy gfarm:///dir1 gfarm:///dir2

$ gfpcopy gfarm:///dir hpss:///tmp/dir

$ cd /mnt/gfarm2fs
$ gfpcopy dir /tmp/dir

To copy a file.

$ gfpcopy gfarm:///dir/file file:///dir

$ cd /mnt/gfarm2fs
$ gfpcopy file /tmp/dir

NOTES

To retrieve the directory entries efficiently, it is better to execute gfpcopy command near the metadata server. When you need to execute gfpcopy command far from the metadata server, increase the parallelism by the -j and -J options.

SEE ALSO

gfprep(1), gfreg(1), gfexport(1), gfarm2.conf(5)

27 Aug 2015 Gfarm