IBM Aspera HST Admin Manual page 246

--tags64=string
User-defined metadata tags in JSON format and base64-encoded that can be used in transfer session
reporting and searches.
--transfer-threads=N[:size]
Use the specified number of dedicated transfer threads and optionally specify the file size at which
files are assigned groups of threads. The number of threads should not exceed the number of
available CPU cores (the lower value of the client and server computers). If no size is specified,
infinity is used as an upper bound.
For example, to use two transfer threads to transfer files smaller than or equal to 128 bytes and six
transfer threads for all other files (those larger than 128 bytes), use the following options:
--transfer-threads=2:128 --transfer-threads=6
-u, --preserve-uid
Preserve the file owner's uid when synchronizing files between Unix-like operating systems. async
must be run as root to use this option. Default: disabled.
--user=user
Authenticate the transfer with the specified username. With this option, the characters "@" and ":"
are not treated specially in the argument to -r or --remote-dir.
-W token_string, --token=token_string
Use the specified authorization token. The token type (sync-push, sync-pull, or sync-bidi) must
match the direction (push, pull, or bidi) of the requested transfer. The token path must match the
remote directory of the requested transfer. If an invalid token is provided, the requested transfer will
be denied.
-w pass, --pass=pass
Authenticate the transfer with the specified password.
--write-uid=uid
--write-gid=gid
Write files as the user uid or the group gid. uid and gid can be numeric, or by name. If by name, the
name is looked up on the host performing the write. Failure to set the uid or gid is logged, but is
not an error. The uid or gid is set after ascp completes and before moving the file from the staging
directory to the final location.
--write-uid conflicts with --preserve-uid, and --write-gid conflicts with --
preserve-gid.
-X size, --rexmsg-size=size
Use the specified size (in bytes) for a retransmission request. Maximum: 1440.
-x, --reset
Clear the Aspera Sync database and rescan the synchronized directories and files to create a fresh
database. Default: off.
-Z mtu, --datagram-size=mtu
Use the specified datagram size. Value is an integer. Default: detected-path MTU.
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