NVR writing to different HDDs

J

Jahua95

Getting the hang of it
May 25, 2020
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USA
Will slowdown in response from NVR cased by writing to one drive and is dividing write to different HDD better and safer in case of HDD failure. Or just do Raid 6 to improve speed of write and security?
 
raid5 & raid6 are very slow in writing.. only fast for reading... and they require minimum 3 & 4 HDDss...

if your recorder have that option, you can create RAID1 (mirror) of 2 HDDs.. or RAID10 of 4HDDs..

if not, you can split HDDs into 2 separate groups in NVR configuration.. and then select half camera channels write to group 1, second half to group 2.,..

if one HDD fail you will lose recordings of only half channels...

ps. I put SD cards to cameras and configure to write events / IVS etc... this is my second backup... works also in situation when someone will stole NVR..
 
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steve1225 said:
raid5 & raid6 is very slow in writing.. only fast for reading... and they require minimum 3 & 4 HDDss...

if your recorder have that option, you can create RAID1 (mirror) of 2 HDDs.. or RAID10 of 4HDDs..

if not, you can split HDDs into 2 separate groups in NVR configuration.. and then select half camera channels write to group 1, second half to group 2.,..

if one HDD fail you will lose recordings of only half channels...

ps. I put SD cards to cameras and configure to write events / IVS etc... this is my second backup... works also in situation when someone will stole NVR..
Click to expand...
I see, RAID 6 no write speed benefit RAID 10 is 2x write performance
I will need to do calculation how much write speed I am currently utilize and see which path do I need to take
 
Jahua95 said:
I see, RAID 6 no write speed benefit RAID 10 is 2x write performance
I will need to do calculation how much write speed I am currently utilize and see which path do I need to take
Click to expand...

normal mechanical 3.5" HDD have something like 150 MB/s read/write performance...
it's 150MB/s * 8bit = 1200 mbit/s...

in normal house market installations with <= 16 camera channels is almost impossible to oversaturate this..

in bigger installations, base solution is disk/channel grouping which I described in my previous post..
 
one more time - RAID5/RAID6 are for mostly reading applications.. not writing ones...
they work ok for most NAS environments.. but not for NVRs..

if you want play with RAID and if you have NVR which supports RAID's - look at RAID1 (2 HDD) or RAID10 (4 or more)...
 
+1 on no raid - once a drive fails in this setting, you lose all the video or it will take days to recover and thus days you are not recording.

Best practice is to spread the channels among the various drives.
 
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