Well, recently one of the servers I monitor and maintain in a remote oil town recently started throwing out a Windows event log warning:
Event ID: 129
Description: Reset to device, \Device\RaidPort0, was issued.
The server is an HP ML350p Gen8 (Windows Server 2008 R2) running latest firmware and management software. It has 2 RAID Arrays (RAID1, and RAID5), and a total of 6 disks.
Researching this error, I read that most people had this occur when running the latest HP WBEM providers, as well as anti-virus software. In our case, I actually tried to downgrade to an older version, but noticed the warning still occurs. While we do have anti-virus, it’s not actively scanning (only weekly scheduled scans).
In the process of troubleshooting, I noticed that under the HP Systems Management Homepage, one of the drives in the RAID1 array, had the following stats:
Hard Read Erros: 150
Recovery Read Errors: 7
Total Seeks: 0
Seek Errors: 0
I found these numbers to be very high in my experience. None of the other drives had anything close to this (in 4 years of running, only one other disk had a read error (a single one), this disk however had tons. For some reason the drive is still reporting as operational, when I’d expect it to be marked as a predicted failure, or failed.
While all online documentation was pointing towards at locks on the array by software, from my own experience I think it was actually the array waiting for a read operation on the array, and it was this single disk that was causing a threshold to be hit in the driver, that caused a retry to recover the read operation.
Called up HPe support, I mentioned I’d like to have the drive replaced. The support engineer consulted her senior engineer and reviewed the evidence I presented (along with ADU reports, and Active Monitoring health reports), the senior engineer concurred that the drive should be replaced.
Replacing the drive resolved the issue. I’m also noticing a performance increase on the array as well.
Make sure to always check the stats on the individual components of your RAID arrays, even if everything is operating sound.