Average Reviews:
(More customer reviews)The present version of synology's o/s (132 MB!) is only able to support 16TB (before applying the raid loss) volumes. What's a volume? It's a raid or no-raid group of disk drives that combines. A stock 1010+ will let you combine 5 ea 2TB (really 1.82 TB) disks to end up with a 9.1 TB volume (which meets the OS limits of 16TB) but when you go to expand it with this unit, you have 10 drives instead of 5 and a 18.2 TB volume if you allocate all drives to one volume (which is the idea - to have as many data disks and just one parity disk). Unfortunately if you went all the way with 2TB drives, you went too far and exceeded the 16TB limit, so the last disk must be left out of your raid volume (it gets 9 drives, one is a parity drive, and your data drives are 8 x 1.82 TB for 14.56 TB of data from the 8 data drives with raid5 protection). The 10th drive is leftover and can be used as a separate 1.82 gb storage volume on the network.
The other option is to make 2 raid5 volumes, each with 4 data disks and 1 parity disk. The advantage is that if the expansion box fails, only the volume on it suffers any data exposure, whereas if the expansion box fails with a volume spanning to the expansion box and the expansion box looses power or e-sata it will destroy the main volume. (the e-sata cable that comes with this unis has 2 screws that hold it in place, and a ups is highly advised)
Either way you loose 2 drives in a 10 drive system - with a 14.56TB volume you loose drive 10 to be just a plain old 1.82 GB disk drive, with 2 separate volumes, you loose 2 drives to parity storage.
For more detail on using the 1010+ see my comments posted below - If I just wanted a big raid, in retrospect, I'd consider their 8 drive rackmount version (which would give me 7 data disks in raid5 or 6 data disks in raid6). The reason is it avoids the 2nd power cord and the e-stata cable for the sidecar - if there is a problem with either of those and your raid spans the sidecar you loose everything fast. The 8 drive rackmount is almost 10 drives, and they have a 16 TB software limit, so with 10 disks, 1 of them becomes "just a disk" and you get 9 disks maximum in a full box + sidecar system - might as well get the enhanced reliability of the 8 drive system for that and not have a 20 inch umbilical cord between your boxes and 2 power cords.
Also power draw is VERY LOW - the system implements spindown when nobody is using the raid.
see my comments below for more info of how these are made.
The good news is that synology does release frequent firmware upgrades which are easy to install. I'll put through a request to support 32GB volumes instead of 16GB so that we can have less parity loss.
Click Here to see more reviews about: Synology 5-Bay Plug-n-Use Expansion Unit to DS1010+, DS710+, and DS1511+ Network Attached Storage DX510 (Black)
Synology DX510 delivers an effortless solution for volume expansion and data backup for selected Synology DiskStations. The DX510 smoothly scales the storage capacity of the Synology DiskStation by an additional 5 hard drives on the fly when firmly connected directly to the Synology DiskStation, ensuring a reliable expansion solution.
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