This editorial was originally published on Jan 28, 2011. It is being re-run as Steve is out of town.
I wrote a blog recently about downtime and SLAs, and the need to have not only downtime SLAs, but also a data loss SLA. Thanks to Paul Randal (blog | @PaulRandal) for clueing me in to the need for having both. In the comments someone mentioned that scheduled downtime ought not be counted against your uptime measurements. That’s a debate I’ve had in the past with employers, and I thought it would be a good Friday poll:
Should scheduled maintenance be counted against your downtime SLA?
There’s an argument that says since the outage is scheduled, and people are informed, that this shouldn’t really count against your work in keeping servers running. The flip side is that when the database instance is down, it’s not useable, and of limited use to the business.
I know that companies that calculate the usage of their vehicles, and maintenance counts against usage time. While it’s necessary, the idea is that mechanics should be looking to minimize it, and perhaps ensure that extra checks are done when the vehicle is being worked on to help prevent future issues. A similar argument could be made for database servers.
Do you feel that scheduled maintenance is downtime? Is it calculated that way at your employer? Let us know this Friday.