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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...
Hi, here are some updated stats, we've spent time over new year putting in additional drives and changing the partitions, so we have a RAID10 partition that we use for iscsi connections and clustered storage. And a RAID1 partition that we use for backup so lots of data changing daily.
The scrub appears to be taken an inordinate amount of time, we expected that after the first scrub post significant data changes that the second scrub would be reduced. However, the first time was 4 1/2 days and a week after completion started again (so we could determine improvement or lack of) it is 5.51% complete after 20 hours.
System ..... OS ....... RAID .... Disks ......... Total ........ Used ......... Balance time ... Comments
A RN3220 . 6...4.1 .... 10.... 6 of 3 TB ...... 8 TB .........6 TB ..... 4 1/2 days. ........ Monthly
A RN3220 . 6...4.1 .... ..1.... 2 of 3 TB ...... 3 TB ... ..... 2TB ..... 15/16 hours. ........ Monthly
B RN3220 . 6...4.1 .... 10.... 6 of 3 TB ...... 8 TB ... .....6 TB ..... ? . ........ Monthly but not scheduled yet
B RN3220 . 6...4.1 .... ..1.... 2 of 3 TB ...... 3 TB ... .....1TB ..... 9 hours. ........ Montly but not scheduled yet
JGwilliam wrote:
Hi, here are some updated stats, we've spent time over new year putting in additional drives and changing the partitions, so we have a RAID10 partition that we use for iscsi connections and clustered storage. And a RAID1 partition that we use for backup so lots of data changing daily.
The scrub appears to be taken an inordinate amount of time, we expected that after the first scrub post significant data changes that the second scrub would be reduced. However, the first time was 4 1/2 days and a week after completion started again (so we could determine improvement or lack of) it is 5.51% complete after 20 hours.
System ..... OS ....... RAID .... Disks ......... Total ........ Used ......... Balance time ... Comments
The chart says balance time, not scrub time. Perhaps you can clarify?
Scrubs require reading every file/folder in the volume and verifying the btrfs checksums. A second balance or defrag should run much quicker than the first, but I don't see how the scrub time would improve (assuming no disk errors).
Some of the maintenance functions will suspend when disk spindown kicks in - I'm not sure if scrub is one of them or not. If you use spindown, try disabling it shortly before (or even during) the next scheduled scrub, and see if the times improve.
Hi, apologies I'd copied and pasted the details as I'd updated the three common threads (balance, scrub, defrag) but changed the times.
Disk spin down is not enabled on either system.
Thanks
Jo
Hi, through a different route but still Netgear I have been provided the following advice, so thought I would share and subsequently will be disabling our scrub schedule.
"If bitrot protection is turned off, regular scrubbing is not required"
http://kb.netgear.com/app/answers/detail/a_id/26941/~/readynas-os-6%3A-an-overview-of-relevant-scheduled-maintenance-tasks-available
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