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Forum Discussion
smbd / btrfs-Transaction high load on cpu - Bug while Backup Job WIndows 10
Hey guys, while WIndows wbadmin Backup i get the following problems, which leads to
- NO ACCESS to my File System while btrfs-transaction is on high load (Browser stuck / Explorer Stuck)
...
When did this problem start?
Did you make changes (e.g. update the firmware) shortly before the problem started?
How full is your data volume?
Problem startet in February 2018 (Where my last Update was made- but it should be daily)
I recognized the process failed after watching for something else in the windows report, and because of the old backup files.
Readynas
- FW: 6.9.3
- dust freed
Data Volume:
- 4 x 1 TB WD Red something which is to use with this NAS . i checked tripple
- XRAID
- data 1,39 TB
- Snapshots: 516.28 GB
- Free Space: 838.51 GB
- Total ~ 2,73 TB
- Type: Raid 5
-TRIED STUFF-
* switch off Bit-Rot from every share
* defrag
* delete snapshots
* switch samba protocols (smb 2 /3 ) ((installed samba plus for that)
* scrubing
* new users
* iperf (works great)
* write I/O internal 54 MB/s
* write from Network 29 MB/s
* read from Network 55MB/s
-> wbadmin backup stream ~ 240 GB
Trying at the moment:
* balancing
process which takes 100% load "brtfs-transacti "
why a transaction on the file system stopps the whole samba process by sucking away the power ?
-> Priority?
Hope I could feed you with Infos.
PC:
Intel i5 somewhat
Network works great to other devices
The SambaProcess slows and fastens by occupied and free cpu % power
Can someone stabilize this **bleep** ?
-> Controlling Application Consumption
Sorry I am an intermediate linux user / advanced windows user - but when you use a Marvel ARM Board with 1,2 GHz then optimize it. Every process going wild at that thing.
If you haven't balanced the volume in a long time that can take a long time. You'll want to let the balance complete before you try other things.
Have you tried disabling "strict sync" in the SMB settings for the share to see if that helps?
You could also try disabling quota and checksums from the volume settings wheel.
* balancing finished after 3 hours - still the same Problem
* Nas-Reboot - still the same Problem
* CPU/Memory affects reading from disk to ethernet via Samba (kworker/u2:0 10%, kworker/u2:3 10%, kworker/u2:4 10%)
Steps which finally did something:
* switched now "strict-sync" in everyfolder off (THANKS FOR THAT TIP)
Big Files ( > 1GB) read speed ~ 40MB/s
Smaller Files (1-700MB) read speeds ~ 62MB/s
Image Writing speeds ~ 32 MB/s (now with small gaps , but no timeouts anymore)
AntiVirus : OFF
Other APPS: SMB Plus - nothing else
Every service like NFS : Shut Down
Internal write speed 52MB/s
Internal read speed 172MB/s
Internal TMPS write speed 152 MB/s
Internal Flash (md0) write speed 40MB/s
Internal read from USB HDD 72MB/s
I do not get a) where is the bottleneck between the "soft raid5" and the ethernet? Is it on the same bus? b) why is processes slowing down the samba server?
Is it possible to install a USB to Ethernet Adapter for checking speeds there?
IPERF 1 GBit ~ 963MBit
When I bought it, the reading speeds where 75-90MB/s and Writing 40MB/s via Network. Now as written between reading speeds 40-60MB/s and Writing speeds max. 32MB/s
Any ideas?
Did you try turning off quota and checksums on the volume settings wheel?
-md0 isn't the flash, it's the operating system partition on the disk. It's RAID-1 (mirrored accross all disks).
-The RN100 performance is constrained by its memory and it's CPU speed. Your internal read/write tests already include the overhead of software raid and btrfs, but they don't include SAMBA.
If the RAID volume is very old, then you might try doing a factory reset (rebuilding the NAS and restoring data from backup). Netgear has made some changes over the years to the btrfs configuration which improve performance for new volumes, but not old. I did that a while back, and I did see a performance boost with my RN102.
Something else that that might create a slowdown - SMB connections now generally use encryption, and that will slow down the speed.
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