Which VMS's support granular mapping of cameras to drives like that?
Also, let's say your 8 cameras average 2Mb/s each, or 16Mb/s total. A typical SATA drive can write data at over 100MB/s, even while having to read data back out for other operations. I don't think the HDD is really the bottleneck in this case.
BTW your Pro #4 above is essentially the concept of Veracity Coldstore.
Pro Focus LLC | 04/01/16 12:04am
I wouldn't think losing a single cameras entire history would be acceptable. We use DW Spectrum (NX Witness) and the way they write to drives is a round robin schedule per hour. Say you have four drives, they write to drive one for one hour, then switch to drive two, then an hour later drive three, etc. This allows drives to be used for one hour at a time, then rested (unless playback occurs). This is similar to Coldstore, but not exactly the same. I don't know how much energy savings, if any is achieved by the Spectrum method, where Coldstore is known and proven.
IPVMU Certified | 01/16/18 07:34pm
We have done this for certain marijuana operations. Due to the varying bitrate of each camera despite identical settings its much nicer in theory than in reality. I prefer the ability to adjust which drives go where over multiple drives and multiple cameras per drive (if using JBOD). That way you can even out the recording time to more closely match across the board.
Interesting idea. I think the drawback would be the extreme cost and space requirements. The cost of drives themselves is not necessarily a concern but rather the cost of SATA controllers for all of those drives. I think the drive quantity within a chassis will be a limiting factor as well. I am assuming we are taking a sizable site here, not a site with 8-16 cameras.
I'm about to install some HIK 9664's with 32TB (8 4TB drives each). From the HIK stock config menu, I can: 1. leave them raw, 2. create a'quick install' RAID, or 3. assign cameras groups to specific drives.
The latter particularly intrigues me, as I've read HIK's RAID reduces bandwidth, and the idea that with the separate drives per camera groups, (as was mentioned above) we might only lose 2-3 cameras vs all of them if the RAID hiccuped.
From my Windows Server experiences, rebuilding RAID's are not fun.
Anyone have any war stories good or bad regarding these options?