Scaling and quotas for SFTP connectors

Quotas for SFTP connectors

The following quotas are in place for SFTP connectors.

Note

More service quotas for SFTP connectors are listed in AWS Transfer Family endpoints and quotas in the Amazon Web Services General Reference.

SFTP connector quotas

Name	Default	Adjustable
Maximum test connection transactions per second (TPS)	1 request per second, per account	No
Maximum queue size for pending file transfers	1000	No
Maximum file size	150 gibibytes (GiB)	No
Maximum transfer time per file	12 hours	No
Maximum request wait time per file	12 hours	No
Maximum bandwidth for connectors per account (both SFTP and AS2 connectors contribute to this value)	50 MBps	No
Maximum number of items for directory listing operations	10,000	No
Maximum number of files per StartFileTransfer request	10	No
Maximum number of transactions per second for StartDirectoryListing request	3	Yes

Note

By default, SFTP connectors process one file at a time, transferring files sequentially. You have an option to accelerate transfer performance by having your connectors create concurrent sessions with remote servers that support concurrent sessions from the same user, and process up to 5 files in parallel.

To enable concurrent connections for any connector, you can edit the Maximum conncurent connections setting when creating or updating a connector. For details, see Create an SFTP connector.

For storing the credentials for SFTP connectors, there are quotas associated with each Secrets Manager secret. If you use the same secret to store multiple types of keys, for multiple purposes, you may encounter these quotas.

• Total length for a single secret: 12,000 characters

• Maximum length of the Password string: 1024 characters

• Maximum length of the PrivateKey string: 8192 characters

• Maximum length of the Username string: 100 characters

Scaling your SFTP connectors

This section describes considerations for how to scale your AWS Transfer Family SFTP connector workloads. You need to take into account the following three quotas that apply when you want to scale your workloads with SFTP connectors.

• The maximum queue size. This refers to the maximum number of pending operations in a connector’s queue that have been requested. A pending operation refers to any previously submitted transfer request that has not yet completed, either successfully or unsuccessfully.

  The maximum queue depth for pending requests is currently set at 1,000 per connector (as defined in AWS Transfer Family service quotas). Your workloads may exceed this service limit when you request thousands of transfer operations over a short duration, and you will receive a ThrottlingException with the message Exceeded maximum pending requests. If your workloads are subject to this quota, contact the Transfer Family service team via AWS Support or your account team to discuss your scalability requirements.

  You can also take either or both of the following actions.

  • Distribute your file volumes across multiple connectors.

  • Have your connectors create concurrent sessions with the remote server to process multiple requests from the queue in parallel.

• The number of concurrent sessions. By default, an SFTP connector transfers one file at a time, transferring files sequentially from its queue.

  You have an option to accelerate transfer performance by having your connectors transfer multiple files in parallel. You can create concurrent sessions with remote servers that support concurrent sessions from the same user, and process up to 5 files in parallel. When you create an SFTP connector, choose a value up to 5 for the Maximum concurrent connections setting when you create or update the connector. For details, see Create an SFTP connector.

• The rate of StartFileTransfer requests. You can request up to 100 file paths per second for transfer with each SFTP connector. The requested file paths are added to your connectors’ queue for processing. You can use the StartFileTransfer command recursively to request up to 100 file paths per second per connector, irrespective of the number of files provided in an individual StartFileTransfer command.