Responding to pressure from newcomers to the storage SaaS market, Amazon announced yesterday that its S3 online storage service will offer a monthly uptime SLA of 99.9%, effective from Oct. 1.

This matches an offer first made by new online storage service player Nirvanix, which came out of stealth last month with its own 99.9% SLA, which at the time Amazon did not match.

It will also come as good news for users of the service, who in the past have complained of unplanned outages and performance issues with the service.