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PowerScale OneFS 9.8.0.0 Web Administration Guide

Etag

S3 may use an MD5 checksum as an ETag. This value is specified in the HTTP header "Content-MD5."

The Etag consistency is implemented to S3 on OneFS protocol to calculate an MD5 hash for a single PUT object operation when no Etag is provided. This feature provides compatibly with AWS S3 behavior and helps the S3 service to calculate and return the MD5 hash for single object PUT operations when an Etag is not supplied by the client.

Two new configuration options, use-md5-for-etag and validate-content-md5 are added to control when the MD5 hash is calculated. The options are in the S3 zone settings and can be configured on a per-zone basis. By default, both options are disabled and the MD5 hash is not calculated. If the validate-content-md5 is set to true, then the MD5 hash is calculated provided the PUT object request has a Content-MD5 to check the content integrity. If use-md5-for-etag is set to true, then the MD5 hash is calculated on request if no Content-MD5 is provided to store as the Etag . If both options are set to true , the MD5 hash is always calculated.


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