nicholashagen

The following code is day-to-day operations when working with 3 forks: an open source project, a local fork of that project, and a company fork of that project. The power of Git is remote aliases that allow you to work with all 3 forks in parallel in the same code base and instantly compare, push, merge, etc.

Setup:

#> git clone [url of local fork: ie: username/project]
#> cd project
#> git remote add project [url of project: ie: project/project]
#> git remote add company [url of company fork: ie: company/project]

yorickdowne

Overview

I was looking after a Dell PowerEdge R420 server with a hardware RAID card in it, a PERC8 H710P Mini. Connected to this were two WD Blue 3D NAND SATA SSDs in RAID-1, that were handling a write-intensive database: Geth, in this case.

After 11 months of running without problems, I had reason to "resync" Geth, and the server could not keep up with the required IOPS. Symptoms were Database compacting, degraded performance messages for hours, without recovery, and read/write latency in excess of 20/70ms, as measured by sudo iostat -mdx and its r_await and w_await data.

The cause of this was that the RAID controller does not support TRIM on the SSD, and the SSD's performance degraded over time because of it.