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In Reply to: RE: Thoughts on Synology NAS SSD Cache posted by lokie on August 20, 2018 at 17:38:16
Today I installed a 500GB SSD as a cache in a QNAP TVS-882 with six disk drives in RAID 5. The Roon core sits on a separate SSD in the QNAP. I hear an improvement in SQ. It's worth trying.
Follow Ups:
I'm not questioning what you hear but I'm curious about your configuration. I'm not quite understanding:
" Today I installed a 500GB SSD as a cache in a QNAP TVS-882 with six disk drives in RAID 5. The Roon core sits on a separate SSD in the QNAP. I hear an improvement in SQ. It's worth trying."
From your description I'm seeing that you have six HDDs in a RAID5 group. Where is your Cache SSD, and where is your Roon Core SSD? Do you have additional slots somewhere for SSDs? I assume that your Cache SSD is just that, Cache. And I assume that your Roon Core is on another SSD.
I'm a bit more limited with my 4-bay NAS. It does have two dedicated NVMe m.2 slots and those are strictly for cache and cannot be configured as a share.
If I use one of my 4-bays for a 2.5" SSD I suppose I could install Roon Core on it. Roon leads you to believe that they need to run on SSD and I'm sure it should perform better there. By 'perform' I'm talking about repsonsiveness and not SQ. However, I'm finding that Roon on my HDD RAID is performing just fine, but I guess YMMV depending on your library size.
In any case, if I install a SSD in my 4-bay NAS that leaves me with 3 spinning disks reducing my capacity by 25%. And that single SSD will not be redundant. (But I back the NAS up to a USB drive so maybe not a big deal).
The QNAP TVS-882 has six slots for SATA disk drives, two slots for SATA SSD, and two slots for m.2. The Roon core runs on the first SSD and the cache accelerator runs on the second SSD. I'm not using any m.2 as yet. I configured the cache for read/write to/from the disk drives only. No reason I could see to assign the Roon core SSD to the cache SSD.With your Synology, it would be nice if you could run the Roon core on one m.2 and the cache on the other m.2. But if that's not possible, then maybe there is some advantage in leaving Roon on a disk drive and combining the m.2s as cache for all four hard drives.
I bought the QNAP principally for it's fast i5 processor, which comfortably handles Roon DSP engine upsampling to DSD128. But it's nice as well to have six slots for hard drives. Two years back the cost of storage was such that I limited myself to three 4TB Western Digital Red drives in RAID 5. As costs have declined, I recently chose three 10TB drives in RAID 5 for remaining three slots. Altogether in RAID that provides around 25TB of addressable storage. Hopefully that's enough for the foreseeable future...
BTW, I think I read on one of the Computer Audio forums that m.2 is electrically less noisy than SSD. At some point I may try migrating the Roon core to m.2.
Edits: 08/24/18 08/24/18
Ah, the flexibility of slots in your QNAP explains it all. I didn't quite get it earlier. Thanks.
"...maybe there is some advantage in leaving Roon on a disk drive and combining the m.2s as cache for all four hard drives."
That's what I'll have to do (someday) as any m.2s in my Synology are used strictly for dedicated Read/Write Cache only.
I played with HQPlayer and Roon DSP when I had them running on the quad-core i7 Mac Mini but I found that I didn't use either very much. I would imagine that Roon DSP would severely tax the Celeron in my Synology. I should try it just for grins sometime after taking a baseline CPU utilization and temperature reading without and then with DSP.
I don't know if a Celeron processor has multiple cores, but if it does, there is a setting in the Roon DSP engine to combine multiple cores. That made a huge difference in the speed of the QNAP's i5 processor.
My Synology has the 64-bit Intel Celeron J3455 Quad-Core 1.5GHz, bursts up to 2.3GHz. I knew going in that it would be lower power (10w) and slower than many CPUs offered in QNAP NAS but I was impressed with the Synology suite of software.
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