optimized simultaneous copy to multiple local destinations
optimized simultaneous copy to multiple local destinations
I want to create a copy of my NAS hosted media folder that is about 30TB. I have a bunch of 4-8TB local (most USB3, some SATA) disks, and I would like to copy these files to the various destinations maximizing space used and time required. Since I have a 10GBE network, I can read data far faster than I can write to any of the destinations, so multiple simultaneous file copies is required at the same time to maximize this activity. doing this manually is painful. trying to select the maximum number of files that can fit (but not go over) each destination is a pain. Any thoughts on a script or an app I can use to assist here is appreciated. I want to leave the files in their native format, so I am looking for a file copy, not block-based backup etc.
Assuming Windows, Robocopy has a multithread option that might be able to do multiple copies simultaneously. Haven't used it. Not sure. Free. Worth looking into.
If you’re only looking to copy every file to a new server, cut everything to a local directory that you know will fit. So rather than copying one and going to the next, split the mass into local directories first and check each one for size requirements. Once you know exactly which ones to copy and when, you could transfer them all at once. And one of the best ways to accomplish it is to copy your directory trees. Make sure you are only copying top directories though since they’re easiest. The directories that take up too much stance and have lots of folders are best to be put in one place. If you do it correctly, once you’ve finished, you can just merge all the folders back into place.
trapexit/mergerfs: a featureful union filesystem
mergerfs is a union filesystem geared towards simplifying storage and management of files across numerous commodity storage devices. It is similar to mhddfs, unionfs, and aufs.
FEATURES
- Configurable behaviors / file placement
- Ability to add or remove filesystems at will
- Resistance to individual filesystem failure
- Support for extended attributes (xattrs)
- Support for file attributes (chattr)
- Runtime configurable (via xattrs)
- Works with heterogeneous filesystem types
- Moving of file when filesystem runs out of space while writing
- Ignore read-only filesystems when creating files
- Turn read-only files into symlinks to underlying file
- Hard link copy-on-write / CoW
- Support for POSIX ACLs
- Misc other things
HOW IT WORKS mergerfs logically merges multiple paths together. Think a union of sets. The file/s or directory/s acted on or presented through mergerfs are based on the policy chosen for that particular action.
https://github.com/trapexit/mergerfs
[Users like you provide all of the content and decide, through voting, what's good and what's junk.]
This is an interesting option but is it suitable for a one time copy?