I would like to ask followup questions for further clarification on the subject line, from post "Questions about migrating Plex Server to SSD volume on QNAP NAS. In one of the replies it is mentioned that QTS is installed on the internal M.2 SSDs, but in another reply there is mention that the mirrored SSDs will have the same failure rate b/c of being written to at the same time, which is why PMS is recommended to be installed on a separate SSD. Wouldn’t having the main OS (QTS) installed on a RAID that has a likelihood of a total failure a concern and reason not choose that path for QTS and PMS? Another question is for my specific use case as it relates to this subject. I have a TS-453Be with 4 HHDs (4TB & RAID 5) and two M.2 SSDs NVMe Samsung 250GB. In my case I am not aware of an option for me to add another SSD for PMS. The way I see and it, and my question is, do I install QTS and ultimately PMS on an SSD RAID or install/‘migrate to’ PMS to an SSD RAID, or maybe no RAID and use one SSD for RAID caching on my main RAID and one SSD to install PMS? Again, keeping in mind my concern for total SSD RAID failure based on the statement that both SSD will wear at the same rate if mirrored.
Seeing as you called out my post specifically, how may I help?
SSDs have different TBW values therefore the lifespan of the SSD is fully governed by the class SSD purchased.
I have Pro SSDs which have the longer life. My least expensive SSD has a 600 TBW lifespan (guarantee) although they last long. PMS is there (CACHEDEV3).
The two I have for QTS , due to the relatively low usage, will last for the life of the machine.
@ChuckPa, thanks for your reply. If I understand you correctly, the TBW is a major factor for SSDs. According to Samsung the Samsung 970 EVO Plus SSD 250GB - M.2 NVMe drives are rated up to 1,200 TBW. However, if they are half as good as 1,200 it sounds like I am good shape.
Could you recommend based using a TS-453Be, installing both QTS and PMS on the expansion SSD and what, if any, RAID level? Please keep in mind that I do not have the option of a separate SSD, without removing a HDD for mass storage. Other options that I can think of if RAID doesn’t really help would be to use one SSD for mass storage cache and use one for PMS.
I understand you do not speak for QNAP or Samsung, just trying to see if you think it’s risky to install both on SSD’s for general user purposes.
On the QNAP Forums it’s usually recomended to install QTS and Plex on the fastest drive, as a preallocated thick volume. In your case the NVME-M.2 as RAID1.
As for drive failure, for a two drive setup RAID 1 is the recommended configuration on a NAS. The chance of both drive failing a the same time is considered really small, but that’s what backups are for.
If you can afford it, you could have a spare NVME drive that you’d replace immediatly after one is failing. Reducing the time without redundency.
I’ve just reinitialzed my TS-1635AX to setup the two M.2 discs as system drives. Mainly for Plex library. As it provides the best performance. In my case even the cange from 190 MB/s to 520 MB/s is quite noticable. With NVME it should be a different class altogether.
My apologies for missing your reply.
My configuration (TVS-1282-i7-32GB)
- 2x Samsung 1TB M.2 (SATA) - RAID 1 (mirror) - QTS volume - CACHEDEV1
- 8x WD Red Pro 8TB - RAID 5 - Main storage thick volume - CACHEDEV2
- 3x Samsung 1TB 3.5" - RAID 5 - Virtual machine storage for VMware (my dev work)
- 1x Samsung 512 GB 3.5" - Single - Plex dedicated volume
- QNAP QM2-384P expansion SSD w/ 1TB Samsung 970 Pro NVMe - System Cache
The 3.5" are all Samsung 860 - I’m using them all the time
The QTS main volume and Cache board, both being internal, are Pro rated for the TBW.
It’s such a pain to pull the NAS out, and dismantle to get to them. At my current usage rate, I’m good for several years. By that time, something far better will have come out and I’ll have likely migrated to it. Who knows, my 1282 might be a door stop by then just to store backups.
@Holger-Kuehn, thanks for your reply and sharing info you found on the QNAP forums.
@ChuckPa, thanks again for your reply and confirming your usage rate. Between your reply and @Holger-Kuehn reply, I am confident to do a fresh install on my TS-453Be using the SSD drives for QTS and PLEX…
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