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Forum Discussion
Scrub feature takes too long to use...
Let's talk about the scrub feature. Is anybody actually using it? I know scrubbing is slow. I expect that. I have the scrub schedule set to do it once every three months. The problem is, it is so...
For others, like me, that are looking for answers and solutions.
ReadyNAS 102 - OS 6.5.1 - Used to store backup.
2 x 6TB WD Red 5700 RPM disks in raid 1.
2TB of data, 0.4 TB snapshots, 3TB empty.
Running the ReadyNAS backup application and using it as FTP server to receive backup files.
Bit Rot Protection is enabled and the Log Analyzer app was running.
Snapshots are turned on, once every 24 hours.
I had run both balancing and defrag some days before. They each took around 2 hours to run.
My experience with scrubbing is as follows:
- Started scrubbing 9:30 on a wednesday morning.
- 24 hours later the scrubbing had reached 5% indicating it would take 20 days!
- After 48 hours it was at 8,5% and an unresponsive/slow web interface. Looked for som answers and found this thread. Turned the Log Analyzer off (installed but off). The web interface became more responsive.
- After 72 hours the scrubbing was at 10,5%. Not looking good.
- After 84 hours the scrubbing had suddenly jumped from10,5% to 52% in 12 hours!
- After 16 more hours the scrubbing finished.
- A total of 100 hours to scrub 2TB of data on 2x6TB disks.
- During these 100 hours the ReadyNAS was slow but responsive over SMB and FTP.
- During this period the ReadyNAS received several hundred GB of data through FTP and its own backup application.
- Around 25 FTP backup jobs and 15 native backup jobs ran during these 100 hours.
- The backup time for these 40 backup jobs was 3 to 10 times slower than before.
- Had to cansel 1 or 2 FTP backup jobs because they stalled and would not continue. Have never had to do that before using the ReadyNAS.
Regards
Johann Hjaltason
FWIW I started a a message intending to provide 'standard' times for Scrubbing, back in 2015, which was still active earlier this year.
The link is https://community.netgear.com/t5/New-to-ReadyNAS/Data-Scrubbing-Find-out-how-long/td-p/936345 and there MAY be some useful stuff in there.
Somewhere else in another message (can't find it now) I suggested a repository of useful info like this, updateable only by 'qualified' people to maintain standards and only provide the facts.
This was thought to be a wonderful idea, by everyone, but does not seem to have been taken onboard by anyone (please contradict me if this has been done).
My objective in doing all this was to help new and existing users with their expectations of the equipment they have bought.
( I also did messages on the other 3 scheduleable activities, in a simialr vein to the scrub one mention above).
I feel like a hermit as my faith has been dented when my seed fell on stoney ground AND did not germinate owing to lack of watering.
My RN516 with OS 6.5.1 is setup as 6 discs of 4TB (WD Reds) in RAID10 and is lightly used.
Data --------- 1.12 TB
Snapshots - 0.73 TB
Free --------- 9.06 TB
Total ------- 10.90 TB
The last run for Data Scrubbing was 21hrs 23 mins, although previous runs have varied from initially 17hrs 34mins through to 19hrs 05mins.
I now run them every 3 months, having run 7 since begining of 2015.
Hope this was helpful.
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