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Forum Discussion
Solved
Volume Scrub duration
RN314 with 4x1TB drives, RAID 5
OS 6.9.3
Approx. 1TB free space
I have my unit configured to perform a volume Scrub twice each year: on January 1st, and July 1st.
The Scrub on January 1st to...
Hi RupertGiles
Checking on your disks all your drives are fine. You may want to try disabling Quota on volume and see if there's any change in scrub time or performance.Regards
RupertGiles wrote:
Had anyone had any experience with the length of time a scrub would take?
Marc_V already pointed you to a discussion thread on that.
There are two components to the scrub - one is a "btrfs scrub" which is done at the file system level. The time that part takes does depend on the file system (fullness, etc). The second component is a RAID scrub. That part touches every disk block in the volume - it doesn't matter if the block is used or not.
If you are running 6.9.3, there should be a progress bar on the volume tab of the web UI that estimates when the scrub will be complete.
As far as time goes, my RN526 has a 4x6TB array, and normally takes about 40 hours to complete a scrub. Simply scaling that down to 4x1TB would give a time between 6 and 7 hours. There happens to be a scrub running at the moment, if there's a significant change in the running time I'll post back.
Thanks for your replies.
The scrub took about 12 hours, as can be seen in the log entry. I wasn't aware of the progress bar. Next time the scrub runs (in January), I'll look for it.
data scrub 2018-07-01 14:26:33 2018-07-02 02:17:14 pass
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