Resolved @ 10:54 CST Database connectivity to all stores on server4400.bigcommerce.com has been restored. All stores are now up and operational. BigCommerce System Administrators have determined that the outage was caused by uncorrectable memory errors in the server and will be working with our data center to have emergency maintenance on the server scheduled for later in the week and the bad memory replaced.
Update @ 10:44 CST The file system check on server4400.bigcommerce.com has completed successfully. We are now in the process of restoring database connectivity to all stores.
Update @ 10:33 CST The file system integrity check on server4400.bigcommerce.com is continuing to progress.
Update @ 10:07 CST server4400.bigcommerce.com appears to have automatically rebooted for an unknown reason and has initiated a file system integrity check. All stores will be unavailable while this occurs. We are still investigating the cause of the reboot.
Post @ 10:00 CST BigCommerce System Administrators have been alerted of availability issues on server4400.bigcommerce.com. Investigations are currently underway.

