Synology DX517 5 Bay Desktop Network Attached Storage Expansion Enclosure, Black

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Create and edit documents, spreadsheets, and slides together with your whole team in real time. Easily migrate existing documents from other platforms and take ownership of your files in a secure private cloud. Learn more The storage space on my Synology NAS (DS1520+) is running out. That's why I bought an expansion unit (DX517). Now I saw your video on youtube called "Understanding the Pros and Cons of the Synology DX517 Expansion - Part I". Unfortunately, part II and III have not been released yet. (Hope they will in future). I am sure that you may would have answered my question in video part 2 or 3. Performance figures obtained through internal testing by Synology. Actual performance may vary depending on the testing environment, usage, and configuration. See performance charts for more information. Extend the standard 3-year hardware warranty of your DS1821+ with 2 more years of Synology-certified support and premium services that help you recover faster in the event of disaster.

Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. This may be one of those cases of "if you have to ask, it's not for you," but I raise the question mostly because I still really like the idea of the expansion unit and still think it might be something I could make use of - I'm just trying to recalibrate my expectations and figure out if it's still something that could be useful for me. SSD cache can be enabled by using 2.5" SATA SSD drives in standard drive bays or without occupying drive bays by installing Synology SNV3400 Series M.2 NVMe SSD drives through the built-in M.2 slots. SNV3400 Series M.2 NVMe SSD drives can also be used to create SSD storage pools. Drives are sold separately.

Given the high cost of the DX517 (and I presume its rumored, impending replacement will be about the same), I'm wondering what people are using it for. I see some posters noting that they have two, or even three of these expansion units. You can save a few hundred dollars over another NAS unit, and I suppose you don't need to deal with more configuration, but why put money into a DX517 instead of larger drive sizes? The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations. Anyway, i want to strictly separate the hdd's / storage from the expansion unit from the storage of the NAS to prevent data loss caused by NAS or DX failure. For example if the NAS or DX Powersupply fails or one of them just stops working, the RAID will be damaged, because suddenly several disks disappear at the same time. This is why i want to separate them. Unfortunately, it is not clear to me how to set it up the right way. I am not sure, if i have to create a separate storage pool with its own volume(s) for the new disks in the expansion unit, or if it will be enought to simply add the disks to the existing storage pool and create a new volume within this storage pool? I think the second option (adding drives to existing pool and creating a new volume in there) will distribute the data from volume 1 and 2 which are in the same storage pool, across all HDD's (These in the NAS and DX517) and will not separate them physically on the Harddrives, right?

I am currently using only two of the DX517's five bays, for a total storage of 46 TB across six 8 TB drives, and a total occupancy of 25 TB (54%). Each 8 TB drive has 7.676 TB storage available. The NAS's operating system reserves 0.324 TB of space on each drive. Filling the remaining three bays with 8 TB drives would provide 69 TB total storage with a currant occupancy rate of 36%. Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). Supports up to 75 IP cameras on a single Synology server with Synology Surveillance Station. Up to 10,000 cameras can be managed per deployment by adding together recording servers with Surveillance Station CMS. Surveillance Station includes 2 free licenses. Connecting more cameras and devices requires additional licenses. Learn more. I currently have all of my media on volume1. I’ve heard/read that trying to span volume1 across the DS918+ and DX517 is a recipe for disaster, so if I get a DX517 expansion unit would I be able to put new media on volume2 and have Plex/Sonarr/Radarr play nice with the new storage pool? the number of connections that can be maintained when the recommended number of hosted files was reached)https://forum.polkaudio.com/discussion/180783/digitizing-my-movie-collection-synology-ds-918-nas-review Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.