Power outage which effected few of the servers

[frank]

Hi,

There was power issue at approximately 8 A.M. EST at one of the data centers (Orlando), we are associated with and the issue lasted for a couple of hours.

What happens when there is power loss is that the hardware technicians immediately go into UPS for a few minutes meanwhile the generator powers up. The UPS ensures no service disruption meanwhile the generator turns on. This happened normally but approximately 40% of the servers tripped during this process. Power loss and going into UPS followed by generator power has happened a few times in the past. But we have never experienced what has happened today - the power surge during this outage was extremely high.

The data center is still running on generator as the power in the city could still be unstable and we do not want to risk any further outages.

We deeply apologize for the inconveniences caused to you.

Ahosting Support Team

[Matt]

Dear Valued clients,

Most of the servers are back online now but there are still some out there having the issue
We are monitoring all servers and trying to bring them up shortly
There will official report be posted once we got informed by data center Orlando
Helpdesk is there for you at any issue for 24hrs via http://www.ahostingsupport.biz
Please do not hesitate to contact with us at any issue
We will keep you posted once new info is there....

[Matt]

At the moment there is no issue remaining with any servers in Orlando at this end.
We will be monitoring all servers as usual and will investigate if anything comes up
We will release official technical report once we have been updated by data center managers
Please kindly report to helpdesk if you still having any kind of issue

Once again we do apologize any inconvenience caused at this issue

[Matt]

Dear Valued clients,

There are no words to describe how deeply we apologize about the downtime which occurred on Friday, May 23, 2008. Moreover, because we realize the level of damage this incident has potentially caused you. We know there is neither money nor words which will replace the losses that may have been experienced by each one of you. Our organization is forever in debt to you all for the frustration and grief endured. It is never easy in disasters, but many of you showed your support as we worked non-stop to get things back to normal. We want to thank all of you for your patience, understanding, and support during such a difficult time. In any case, a formal incident report of our investigation is what we wish to rightfully deliver to you. Below is the detailed summary of events as they occurred. Please note some of you may have not experience any outage during this, not all clients were effected but we wanted to keep everyone updated.

What happened:

At approximately 8 A.M. EST our data center experienced a surge followed by a power outage which lasted several minutes from data center electrical utility provider Progressive Energy. The surge tripped facility's main breaker; this main breaker is designed to have a certain level of sensitivity and to trip in the event of a severe surge in order to protect the load (servers and critical equipment) from being burned. Immediately after this occurred, our generator automatically started up within a few seconds. Meanwhile power to our load (servers and equipment) was automatically transitioned from unavailable raw power to generator power by the automatic transfer switch (ATS), uninterruptible power system (UPS) in conjunction with our battery set supply is supposed to automatically sustain continuous power to the load. However, it appeared this did not happen. In any case, generator power was indeed immediately available within the minute of the outage.

Immediately post the outage our engineers and electricians came on site. The diagnosis conducted revealed there was a fault within a battery string which is connected to the UPS. It is this fault that disabled the UPS from being able to fully sustain continuous power to the load meanwhile the ATS transitioned the facility to the generator power lines from the raw power lines. During this time a great portion of the data center experienced a sudden power loss which caused a myriad of servers to power cycle. Unfortunately, at times when some systems experience sudden power loss some require manual administrator intervention to get full function restored. Post the outage, our team immediately started working on checking systems and all servers that may have been adversely affected by the sudden power loss these experienced.

What was done to correct the problem:

Our on call UPS maintenance technician along with our electricians and engineers immediately came together on site to conduct a thorough diagnosis and put together a plan of action to correct any and all possible issues.

While the age of the battery supply being employed was well within the manufacturer's life span expectancy, the entire battery supply was replaced with a new set. In addition, our UPS underwent a thorough in depth inspection and all critical components were individually inspected and reconditioned as necessary. Lastly, the batteries and UPS were load tested before being re-employed to the overall power back up system to ensure 100% reliability. All this was completed within several hours of the incident.

Who was affected:

The power outage experienced was intermittent. However, once power was fully restored to the facility many servers required file system checks (FSCK), some power supply replacements, and a few others hard drive replacements due to excessive I/O errors. Unfortunately, depending on the space on the drive the system occupies a FSCK run time can range from 30 minutes to a nine hours plus (approximately 200 servers counted). Those that were worst affected are the systems that were having excessive I/O errors and needed hard drive replacements (approximately 12 servers total counted). Again, unfortunately, hard drive replacements may take 4-12 hours plus to complete depending on the space being occupied on the drive. Those that were least affected were servers that only required a power supply replacement (approximately 60 servers counted).

For those servers that experienced the greatest downtime was not due directly to power unavailability, but rather due to post sudden power loss adverse effects described above.

What preventative measures are being taken:

All critical power systems in our data center and loads were previously and are regularly inspected and maintained. This includes generator, UPS, breakers, etc. In fact, our UPS underwent an inspection and a maintenance service on the week of the 12th of May 2008. The service report came back showing the UPS was in good working condition as well as the battery supply set. The only advice made was to consider replacement of the battery set supply as these were approaching the last year of the manufacturer's life span expectancy. Pro actively following up on the advice made by the maintenance engineer, a new battery supply set was ordered right away and scheduled to be installed this Tuesday May 27, 2008.

Unfortunately, the battery supply set is what ended up being the fault and ironically this is what was already schedule for routine replacement maintenance. It is difficult to state that more could have been done as the batteries were within their life expectancy limits but failed short during this situation. Something of this magnitude, unfortunately, could not be predicted and was already being addressed with a new battery supply set replacement as a proactive measure. Nonetheless, a new standard has now been adopted as we will be increasing the battery reliability tests schedule to be completed monthly. This will allow us to intercept any and all types of possible issues with any battery sooner and overall highly reducing the probability of a failure encounter during critical times.

Our data center employs a 500KVA UPS and a 500KW generator. This is a statement that can be further proved by the recent pictures and videos taken yesterday afternoon. If you are in any kind of doubt whatsoever with regards to this, we would like to kindly ask for the opportunity to disprove your doubt. The pictures and videos below are of our backup systems in place which have protected us from several past outages to the entire data center. We uncover what maybe some of you didn't know was in place in our facility since day one so you can see that your services with us are secure.

Data center been in the industry close to 8 years now and we have always tried our best to ensure 100% uptime to all of you. This is the first outage we experienced with this level of severity in our entire existence. It is not only our job but our passion to give you the best level of service possible. We do not want to use the misfortune of this unpredictable situation to be an excuse for the downtime experienced. We value your business relationship and the level of trust you put in us.

Please do not hesitate to contact with us via helpdesk at any issues