Re: arc_meta_used > arc_meta_limit, need tuning hints

[Victor Sudakov]

D. R. Evans wrote:
> > No ZFS gurus here? Where could I ask?
> > 
> 
> zfs-disc...@list.zfsonlinux.org

Thanks, subscribed:
https://zfsonlinux.topicbox.com/groups/zfs-discuss/Tc55ff6ef317b8932/arcmetaused-arcmetalimit-need-tuning-hints



-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/


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Re: arc_meta_used > arc_meta_limit, need tuning hints

[D. R. Evans]

Victor Sudakov wrote on 9/30/20 7:12 AM:
> No ZFS gurus here? Where could I ask?
> 

zfs-disc...@list.zfsonlinux.org

  Doc

-- 
Web:  http://enginehousebooks.com/drevans



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Re: arc_meta_used > arc_meta_limit, need tuning hints

[Victor Sudakov]

No ZFS gurus here? Where could I ask?

Victor Sudakov wrote:
> Dear Colleagues,
> 
> On a system with many small files, I often observe arc_meta_used over 
> arc_meta_limit:
> 
> # grep arc_m /proc/spl/kstat/zfs/arcstats 
> arc_meta_used   45580987440
> arc_meta_limit  45532735283
> arc_meta_max46179223472
> arc_meta_min416777216
> # 
> 
> I think the situation is abnormal and degrades performance. Running
> "echo 3 > /proc/sys/vm/drop_caches" clears the situation ... for a while. 
> 
> I've tried increasing zfs_arc_dnode_limit_percent and
> arc_meta_limit_percent to no avail. What else can I tune?
> 
> Debian 10, zfs-0.8.4-2~bpo10+1
> 
> -- 
> Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
> 2:5005/49@fidonet http://vas.tomsk.ru/



-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/


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arc_meta_used > arc_meta_limit, need tuning hints

[Victor Sudakov]

Dear Colleagues,

On a system with many small files, I often observe arc_meta_used over 
arc_meta_limit:

# grep arc_m /proc/spl/kstat/zfs/arcstats 
arc_meta_used   45580987440
arc_meta_limit  45532735283
arc_meta_max46179223472
arc_meta_min416777216
# 

I think the situation is abnormal and degrades performance. Running
"echo 3 > /proc/sys/vm/drop_caches" clears the situation ... for a while. 

I've tried increasing zfs_arc_dnode_limit_percent and
arc_meta_limit_percent to no avail. What else can I tune?

Debian 10, zfs-0.8.4-2~bpo10+1

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/


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