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how configure Readynas 524X for best video surveillance performance
Hello I have a readynas 524X with four 4TB disks. I use the readynas surveillance app that i still think is good. I want to ask the community if anyone can tell me how i should configure my ready...
mangebest wrote:
its WD40EFAX 4 TB times 4disks.
If you are looking for the best performance, the drives are the foundation. Unfortunately the WD40EFAX isn't the best choice for a surveillance application - the WD40EFAX is an SMR drive. So its sustained write performance is quite poor (and very variable).
The WD40EFZX (WD Red Plus) is much better for this - it uses CMR technology.
An Enterprise class drive like the WD4003FFBX (Red Pro) has a faster RPM - which doesn't improve sustained write speed that much over the EFZX, but would improve random access times (which might help when browsing through files for playback). Enterprise drives do cost more, but they also generally come with 5 year warranties.
mangebest wrote:
The surveillance program tells me that when all the cameras are on the bitrate is 66000 Kbps.
In your opinion should i go for new disks or 10gb network to my client?
66 megabits per second? Or 66 megabytes per second? Both can be handled comfortably by a gigabit infrastructure, but it still would be useful to know (see below).
I am thinking now that the main problem is the SMR drives. They depend heavily on caching, and when the caching isn't enough the write speeds get really really slow. If your cameras are always recording, the caching definitely won't be enough.Playing with RAID modes (or settings) probably won't overcome this.
So I'd go for new disks over a 10 gb network upgrade.
mangebest wrote:
..should i maybe go for SSD?...
They would of course be much faster, and much more expensive for 4x4TB. Performance with SSDs would be limited by the network, no matter what RAID mode you used. You do need to pay some attention to the write limits.
Four 4 TB Samsung 870 drives would cost you about $1700 (current US amazon price), and each drive is spec'd at 2400 TB worth of writes over its lifetime. Assuming 66 Mbps from the cameras, you'd be writing about 1 TB per day (counting RAID-5 overhead), spread evenly across all four drives. So about 250 GB per drive per day. Over the 5 year warranty, that works out to ~460 TB/drive (and it would take over 20 years to reach the write limit spec).
But 66 MBps would be 8x the load - about 7.6 TB/day total, or roughly 2 TB per drive per day. In that case the drives need to be replaced about every 3 years. That is why I asked about the units above.
The write limits do vary, so you'd need to get this info for the specific SSDs you purchase. (BTW, the Samsung 2400 TB spec is only for the 4 TB 870. The spec is lower for smaller SSDs).
If you use all new drives in your NAS (or factory default with the same ones), you will have an issue with the ReadyNAS Surveillance serial number(s), likely because the Linux UUID changes. I believe Netgear support can still help you with them, but I think you really should start considering alternatives.
OK
thanks for all help.
I have some thinking ahead of me. Maybe i just leave it as is. Would like to try the pro disks though
best regards
Magnus
To use the new drives, just replace them one at a time and all the configuration (including UUID) will be retained. It's a lot slower, as each new drive has to re-sync before you swap the next. The only concern may be the green drives tying things up such that the surveillance has issues getting access during the re-sync. The CPU of your NAS has enough horsepower that it shouldn't be a factor.
that would be wonderful, but will it work when i have RAID 0 ?
Can i just replace two disks and let the two other bays be empty?
mangebest wrote:
that would be wonderful, but will it work when i have RAID 0 ?
Can i just replace two disks and let the two other bays be empty?
You can't change to RAID-0 unless you destroy your current volume. And that will create the problem with ReadyNAS Surveillance.
Also, you can't shrink an XRAID array from the NAS admin UI - so you won't be able to reduce the number of disks in your existing volume.
Maybe wait for the Netgear Mods to speak to your concerns on ReadyNAS Surveillance.
I think i got my RAID confused- seems i have RAID 5 and that would mean i can change disks one at a time?
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