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Forum Discussion
Data Scrubbing - Find out how long?
Being new to ReadyNAS there were various things I wanted to know. One of these was Data Scrubbing. Now having understood more about it, the obvious question is how long does it take. I have now don...
System ..... OS ....... RAID .... Disks ......... Total ........ Scrubbing time
RN516 ...... 6.2.4 .... 5 ....... 6 of 6 TB .... 27.17 TiB ... 1 day, 5 hours, 5 minutes and 44 seconds
Ran scrub for the first time since NAS installed (around November 2013).
System OS Raid Disc Usable Space Used Data SnapShot Free
RN104 6.4.1 5 (X-Raid) 3 * 1TB WD10EFRX-68JCSNO 1.81TB 828.95GB 330.97GB 692.38GB
Total time 66 Hours 47 Minutes
Oddly the first 26.67% took 51 hours 38 minutes with the remaining 73.33% taking only 15 hours 9 minutes.
Question – When using raid 5 with data striped across 3 spindles is it worth running the scrub utility?
Will now see how long the balance option takes or should it be defrag before balance? Beats me.
nickbatch wrote:
Question – When using raid 5 with data striped across 3 spindles is it worth running the scrub utility?Yes. The scrub reads all the files, and verifies the btrfs checksums. That is worth doing every now and then. I'd suggest a three month schedule.
nickbatch wrote:
Will now see how long the balance option takes or should it be defrag before balance? Beats me.
I don't think it matters much, as they do different things. It might be slightly better to do the defrag first.
Thanks StephenB for reply.
Whilst concerned & somewhat confused as to the the time taken and progress for the Scrub I'll reschedule in 3 months.
I actually ran the defrag before the balance and they only took 15 minutes and 7 minutes respectively.
Rather bizarrely the data figures changed to Used=829.03 Snapshot=339.76 Free=682.65. The variance prior to the defrag being Used=+0.08 Snapshot=+8.79 Free=-9.73. Note no snapshot activity shown in log and Used (0.08)+Snapshot(8.79)=8.87 not 9.73.
I have to say the underlying architecture on the ReadyNas defeats me but there again do I need to know how it works? I use to know such things as it helped to configure disks etc for performance (showing my age I guess) but these days everything is so black box we have to take it at face value and hope for the best.
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