Home Lab Update

25. July 2019 12:48 by Cameron in Plex, server  //  Tags: , , , , ,   //   Comments

A couple of weeks ago, I expanded my server's RAID 6 array to 40TB, but in the process the RAID controller's write cache failed. I didn't know that this was the problem right away though. I had just told the array to expand the volume to 40TB and then the application froze and it seemed like that wasn't going to complete. I became impatient and force shutdown the server before the operation completed. However, when I went to restart the server, it would not recognize the write cache and it failed to boot. Then, I tried removing the external card and moving everything back to the onboard P410i.

The original reason for getting an expansion RAID card was to have RAID 6 support without the need for a license. The P410i requires a license and they're prohibitively expensive. The P812 expansion cards are $12 a piece and it was the right choice for my needs. After determining that the RAID card had failed along with the cache, I ordered another P812 and cache module. In the mean time, I was able to boot my server with the onboard P410i and backup the content from the array although there was no write cache. It took a couple of days, but now everything is backed up to two 8TB hard drives.

When my second P812 arrived, I was able to install the new card and get back up and running. I recreated the RAID 6 array at 40TB and have begun copying my files back over the network. The process is slow as I'm using 1Gbits at the moment and for some reason my USB 3.0 hard drives are only operating at 480Mbits. Though, it should be faster in the future with 10Gbits. I'll need to install an NVMe drive in my desktop to take full advantage of 10Gbit throughput. My server is limiting SATA drives to SATA II at 3Gbits and my desktop is capped at 6Gbits with SATA III. I've installed an NVMe SSD into my server and can get about 1600MB/s read/write or 12Gbits.

Next, my plan is to get an NVMe SSD for my desktop, two 10Gbe cards, and an SFP+ cable to connect them. I will also need to write some PowerShell to copy files from my HDD to the SSD and then over the network to my server. On the server, then watch the SSD for new files and copy to the RAID array. The end goal being that files are copied between SSDs on both ends.

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