Forum Discussion

Aspirant

Oct 11, 2015

btrfs-cleaner always stuck at 100% CPU after 6.4.0 upgrade

Hello, After 6.4.0 upgrade btrfs-cleaner process always uses 100% cpu even after many uptime hours. SMB shares are ok (but slow) Frontview times out after authentication. Top command (ssh i...

Installation & Upgrade

Joufflu

Aspirant

Oct 18, 2015

I think that automatic snapshot prune does not work on my RN102.

According to this KB :

http://kb.netgear.com/app/answers/detail/a_id/23353/~/what-are-basic-snapshot-concepts-i-need-to-understand-before-operating-my

"Daily snapshots are kept for four weeks."

But I see many snapshots older than one month on shares configured with daily snapshots.

It seem to keep a monthly backup and never delete it.

I never made manual snapshots.

I'm cleaning old snapshots but it's really long on large shares.

AlexPe

NETGEAR Expert

Oct 21, 2015

Dear Joufflu,

Hourly snapshots are kept for 48 hours.
Daily snapshots are kept for four weeks.
Weekly snapshots are kept for eight weeks.

Do you have any that are older than eight weeks? So the way snapshots work is it still takes weekly snapshots if you have daily snapshots selected and if you have hourly, it will take all three at selected intervals.

So you might have weekly snapshots that are still present. The key to checking is to see when the oldest snapshots were taken and see if the dates are synonymous with an 8 week interval.

Thanks

Alex

StephenB
Guru - Experienced User
Oct 21, 2015
AlexPe wrote:

Hourly snapshots are kept for 48 hours.

Daily snapshots are kept for four weeks.

Weekly snapshots are kept for eight weeks.

And monthly snapshots are kept forever (unless manually deleted).
Joufflu
Aspirant
Oct 21, 2015
AlexPe a écrit :
Weekly snapshots are kept for eight weeks.
Do you have any that are older than eight weeks? So the way snapshots work is it still takes weekly snapshots if you have daily snapshots selected and if you have hourly, it will take all three at selected intervals.

Hello,
On shares with auto daily snapshots there were (before I deleted them manually) :
- a snapshot per day on the last 4 weeks
- a snapshot per week between the last 4 to 8 weeks
- a snapshot per month (before this 8 weeks period)
as described by StephenB

I deleted all snapshots (165GB).
On a large share (480GB now), btrfs-cleaner worked 20-25 minutes to clean each snapshot.