If your system runs Linux, you can use tmpfs which will also take care of swapping out data to disk if your RAM disk runs out of space. Now again, if you are looking for ultimate speed, you should instead be using NVMe or SSDs in cache, preferably 1TB drives at a minimum because they typically have larger on-board cache. Assuming a 6mbit/s transcode, you would need about 2.7GB of storage per hour of buffer. If you don't want to use your HDD to buffer to avoid noise, power consumption, or vibration: If you're transcoding to h.264 anyway (which doesn't take up much space), you might just want to use a RAM disk. If you're worried about the additional spin-ups causing your 500GB HDD to fail earlier, and losing the data on it, consider buying another 500GB HDD and using a RAID configuration. Don’t worry about USB 2.0 being slow, as once the system boots, the. I picked up a 32 GB USB 2.0 drive to use specifically for Unraid, and it’s worked wonderfully. You’ll have to run it bare metal, meaning that you boot the system off of the Unraid USB drive.
Cache drive unraid setup plus#
ZFS was primarily designed as hard disk plus ultra exotic (back then). Unraid is the base OS for your storage server, much like Synology’s DSM. HDD's can handle high write loads much better than SSD's can, and even the slowest hard drives still seek much faster than needed for a DVR workload (even the earliest hard drives from the 1950's took only about half a second to seek, which is probably good enough.). These are the steps what I went through in setting up the firewall and routing.
Considering that your write speeds to an Unraid cache drive is most likely bottlenecked by a gigabit networking interface, there is no advantage to using an NVMe drive over a SATA drive. If you're worried about hardware longevity or seeking performance: You're best off just using your HDD. What the drives do share is their endurance: the 870 EVO with a capacity of 500 GB is good for 300 TBW. Particularly on a low capacity SSD (with less flash to spread the write load across and fewer reserve sectors to replace failed sectors), this could lead to accelerated drive failure. The external enclosures are of course port multiplier capable so I have a PCIe x4 port multiplier card that handles four of the enclosures and I have one PCIe x1 port multiplier card that has one of the four bay enclosures attached with three drives.
Cache drive unraid setup how to#
(its rather small so that's a lot of data) And I was wondering how to force a. I only have two drives in my unRAID server itself. I noticed that there is around 50GB of data on my server's cache drive. Keep in mind any files that are in use will not be moved, until they're no longer in use when the mover runs. I will still keep this disk around as a scratch disk. How to manually flush a cache drive on unraid. Assigned the NVME as the cache disk even though I found out that this is mainly used for docker / VM cache, and not as much for file read/write cache. Excessive writes to flash storage wears it out faster. All of the drives showed up in UNRAID no problem.