Internet cafe write-back disk being filled up causing client machines unable to boot.
The internet cafe called and reported that two machines just experienced blue screen errors, followed shortly by another machine facing the same issue. All three computers displayed the same error code:
Blue Screen Code: MEMORY_MANAGEMENT
The occurrence of individual blue screens, indicated by memory management or memory stack errors, often suggests compatibility issues, which are relatively common. However, the simultaneous appearance of these blue screens is unusual. After inquiring, it was found that the affected machines were running three different games, ruling out issues specific to the client machines. It appeared more likely that there was a problem with the server's write-back disk or the internal network.
Upon remote access to the server, tests were performed for pinging both the router and an internal network client machine, both yielding no problems or delays. However, after a while, reports emerged from the internet cafe that all newly launched machines were unable to start, accompanied by Error 6677. Upon investigating, it became evident that the write-back disk was experiencing problems. Upon opening "My Computer," the write-back disk was found to be almost full with only 1.4 MB of space left. It became clear that the previous blue screens were also a result of the inability to write back to the server's disk.
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After the write-back disk of the server became full, upon examining the folder sizes sorted by IP, it was surprising to find that the write-back data from one machine had accumulated to a staggering 328 GB. This single machine's write-back data had consumed more than half of the server's total 500 GB capacity. The situation is illustrated in the following image:
I asked the network administrator to check what the customer was doing, and they replied that the customer hadn't been doing anything apart from playing CS:GO on the Perfect World platform. However, it seems that the Perfect World platform was simultaneously updating Dota 2. This continuous download of files is likely caused by Dota 2, as depicted in the following image:
The background repair of Dota 2 was performed using Mushroom software, revealing that there was an update. The issue likely stems from this situation.
It's worth mentioning that typically, internet cafe write-back disks shouldn't become completely full. However, as a precaution, it's advisable to enable the option "When the remaining space on the write-back disk is insufficient, automatically restart the client machine with the highest disk usage in the current disk." This can be configured in the server settings, as depicted in the following image: