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Forum Discussion
Volume Maintenance and Bit-rot
My NAS and usage may help with this question? NAS: RN626 Apps: Plex/Anti-Virus and Photo Hosting Weekly Backkups of two PCs's Files and images. Month adds of a few hundred photos/videos. Host...
That's good feedback as usual. I believe you have a 526 so do you use Bit-rot and if so was there a significant performance hit? I didn't have it turned on when I moved all my data to the new NAS and from what I read it would only help with new files written to the NAS. So I guess the protection would be limited? As for the other tests, I was going to run the defrag/balance twice a month and the scrub (which takes forever) 3 times a year. I dont' really know what the disk test does or if it's necessary as their is no explaination given in the manual.
NASguru wrote:
That's good feedback as usual. I believe you have a 526 so do you use Bit-rot and if so was there a significant performance hit?
It's not turned on in my RN102 and RN202 (both are jbod, so it doesn't really apply). The RN526 isn't really set up yet - I'm still kicking the tires on it. It's on at the moment, and I'm planning to leave it on.
NASguru wrote:
I didn't have it turned on when I moved all my data to the new NAS and from what I read it would only help with new files written to the NAS. So I guess the protection would be limited?
It should work on all the files in the shares where it's turned on (even if it is turned on after files are written to the share).
NASguru wrote:
I dont' really know what the disk test does or if it's necessary as their is no explaination given in the manual.
I believe its the long non-destructive SMART test (built into the drive).
Got it on Bit-rot and I intend to do some testing here using a dummy share and files to see what if any hit the 626 takes. I'm sure there is some degration but I'm still not convinced it's needed given my use. Although, if the performance hit is negligible I may just leave it on for added insurance. Especially on files that are rarely accessed such as old pictures/videos. You wouldn't happen to know how long that disk test runs? It probably varies per disk and array size but just ballpark would be enough of an idea. I'm unable to run it manually (unlike defrag/balance/scrub) but I could set the schedule so that it runs instantly. And get that 526 up into production already as this forum is depending on you! You're like a one man team on here and for the most part one of the few that reliably responds to my post regardless of which section I post in. :smileylol:
NASguru wrote:
You wouldn't happen to know how long that disk test runs?
The last run on my RN202 was on the 6 TB drive. It took about 12 hours.
NASguru wrote:
Got it on Bit-rot ... but I'm still not convinced it's needed given my use.
As mdgm says, some shares definitely shouldn't use it (or snapshots). Torrent download folders is one example - the file is updated every time a block is received, and that creates a lot of fragmentation.
As far as overhead goes, if there are no errors the main overhead is computing the btrfs checksums when data blocks are written and verifying them when data blocks are read. I doubt if you'd see any impact on your 626X unless you are using 10 gbit (and maybe not even then). Though its worth testing.
StephenB wrote:
NASguru wrote:You wouldn't happen to know how long that disk test runs?
The last run on my RN202 was on the 6 TB drive. It took about 12 hours.
NASguru wrote:Got it on Bit-rot ... but I'm still not convinced it's needed given my use.
As mdgm says, some shares definitely shouldn't use it (or snapshots). Torrent download folders is one example - the file is updated every time a block is received, and that creates a lot of fragmentation.
As far as overhead goes, if there are no errors the main overhead is computing the btrfs checksums when data blocks are written and verifying them when data blocks are read. I doubt if you'd see any impact on your 626X unless you are using 10 gbit (and maybe not even then). Though its worth testing.
Yup, that makes sense and I'm not running Torrent so no worries there. I'll test it either way once I get some time here.
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