Working through installing CentOS 6.4, ESXi and others, I started running into issues where the systems would run their PXE installations just fine, then end up hanging at booting from local disk afterwards… As it turns out, the systems we’re having issues trying to boot to /dev/sda when /dev/sda was not always where the OS was getting installed… as it turns out, sometimes the local SSD would be /dev/sda, /dev/sdo, etc. This is due to the mpt_sas driver getting loaded after the megaraid_sas driver.

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Trying to find a failed drive that does not have a red light on it can be quite challenging with the Open Vault Knox Unit(s) since the drives/slots are not labeled.

After looking around the interweb’s and reading the Open Compute Project Open Vault Storage Specification I found the diagram indicating which drive is which.

Open Vault Knox Unit Drive Layout

Open Vault Knox Unit Drive Layout

That being said, you should be able to use MegaCLI to identify the drives using the following command:

Using MegaCLI, you can also list those drives, and their status using:

And you can see the results here, after the drive was replaced.

The Wiwynn ST7110-30A is a 30 drive SAS/SATA JBOD storage array designed around the Open Compute (OCP) platform. Known as the “Knox Unit” or “Knox Device”, it is manufactured by Wiwynn. The unit is field serviceable, completely tool-less, entirely redundant, and quite easy to manage and configure. See the entire feature breakdown here.

Device Information

Wiwynn ST7110-30A

Wiwynn ST7110-30A

Highlights
● Highest storage density in the industry
● Tool-less design for easy maintenance
● Hot-pluggable HDD
● Full redundant data path to each HDD
● Hot-plug and redundant cooling for high availability
Specification

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