My favorite example: This can be run from the shell or within the tool. hpacucli ctrl all show config (use hpacucli.exe for Windows) Or hpacucli ctrl all show config detail But, if you have the HP Management Agents installed anyway, you should have realtime monitoring of RAID status pushing back to email alerts or an … Read more
RAID-5 is a fault-tolerance solution, not a data-integrity solution. Remember that RAID stands for Redundant Array of Inexpensive Disks. Disks are the atomic unit of redundancy — RAID doesn’t really care about data. You buy solutions that employ filesystems like WAFL or ZFS to address data redundancy and integrity. The RAID controller (hardware or software) … Read more
Just recently I read an article by one of Godaddy’s engineers about this very topic: Learning to Deal with Learning On their hardware (Dell PERC cards) battery learning cycle happens every 90 days, but no way to know when exactly it’ll happen, ie during peak or off-peak hours. They talked about different solutions: Outright disable … Read more
Assuming you’re on a recent firmware revision for the DL320 G6 server. You’re going to have to pay close attention to the POST messages in order to catch the RAID controller’s ORCA utility prompt. The “Sea of Sensors” POST routine takes awhile from the first screen prompt (on a warm-boot) to step through RAM checks … Read more
I suspect your Supermicros are broken one way or the other – possibly the battery packs are overheating. Most recent LSIs would report the temperature through MegaCLI – you might want to monitor this value on servers which needed replacement. root@host:~/SOLARIS# ./MegaCli -AdpBbuCmd -GetBbuStatus -aALL BBU status for Adapter: 0 BatteryType: BBU […] Temperature: 41 … Read more
It allows the raid card to remember what is in its buffers ( that hasnt been sync’d to disk ) Its very important for people who need high data integrity.. Or to save your DB from certain types of corruption.. (Basically whats on disk, is on disk – so thats safe.. The problem is when … Read more
It doesn’t power the disks, it just keeps the data in the cache for (in this case) up to 72 hours until you bring the machine back on line. When you power the machine back up it will write the contents of the cache back out to the disks. All it does is protect against … Read more
The Prior Answers from Aug are over thinking this on the Windows side. A. You have Server 2008 B. The possibilities are disks are in a hardware RAID or not. Rick click on the “computer” icon on the desktop or the computer item in the Start Menu Select Manage Expand Storage Click on Disk Management … Read more
A 10-20$ “hardware” RAID card is nothing more than a opaque, binary driver blob running a crap software-only RAID implementation. Stay well away from it. A 200$ RAID card offer proper hardware support (ie: a RoC running another opaque, binary blob which is better and does not run on the main host CPU). I suggest … Read more
As Michal pointed out in his comment, the issue was a “prefailing” disk. There were no red flags in the diagnostics from the megaraid controller and smartctl’s SMART Health Status: was OK, but running smartctl on each disk revealed a huge Non-medium error count (I wrote a quick bash script to loop through each disk … Read more