05-24-2017
The answer will always be 'It depends.'
- What is the data like (how much can it compress)?
- Are the file attributes set to compress them? This will cause delays in itself.
- Is the target on the same server?
- For a local copy, there could be disk contention.
- What is you disk infrastructure like? Do you have multiple controllers, SAN disk (how many paths etc.) or simple disks with logical volume mirrors?
- How much data are you copying?
- How many files are there? A file creation takes several IO operations beyond the volume of data so many small files can copy slower than few bigger ones.
- How much memory do you have? For a copy to the same server with lots of free memory, you might be able to cache the files to reduce IO contention something like this:
find /path/to/source -type f -exec cat {} \; /dev/null
- For a remote copy, what is your network like - and that could be endless........
What can you tell us about the server(s) and data? It will probably be trial and error.
If this is a regular process, consider
rsync which will only copy differences. It might still be slower if you have milliions over small files though. If there is lots of data change, perhaps you should consider snapshots, but then you haven't told us what OS you have, so i don't know if that's available to you in any useful way.
Robin
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CFS(4) Kernel Interfaces Manual CFS(4)
NAME
cfs - cache file system
SYNOPSIS
cfs -s [-rd] [-f partition]
cfs -a netaddr [-rd] [-f partition] [mtpt]
DESCRIPTION
Cfs is a user-level file server that caches information about remote files onto a local disk. It is normally started by the kernel at boot
time, though users may start it manually. Cfs is interposed between the kernel and a network connection to a remote file server to improve
the efficiency of access across slow network connections such as modem lines. On each open of a file cfs checks the consistency of cached
information and discards any old information for that file.
Cfs mounts onto mtpt (default /) after connecting to the file server.
The options are:
s the connection to the remote file server is on file descriptors 0 and 1.
a netaddr
dial the destination netaddr to connect to a remote file server.
r reformat the cache disk partition.
d turn on debugging
f partition
use file partition as the cache disk partition.
All 9P messages except read, clone, and walk (see intro(5)) are passed through cfs unchanged to the remote server. A clone followed imme-
diately by a walk is converted into a clwalk. If possible, a read is satisfied by cached data. Otherwise, the file server is queried for
any missing data.
FILES
/dev/hd0cache
Default file used for storing cached data.
SOURCE
/sys/src/cmd/cfs
CFS(4)