It looks I have typo in following:
/*
All of these (used, usedby*, refer, quota, refquota) include metadata (e.g.
indirect blocks).
[Fred]: So “quota” overrides “refquota” as in my case? Otherwise the logic
should be {“used” < “referenced” < “refquota”} per this reply.
*/
The one I want to state is { “*usedbydataset*” <= “referenced” <= “refquota” }.
But there are still some unclear points for me here:
1): To enable file removing, my hacking is "$new_refquota = $usedbydataset +
1". After this, we can remove files.
But it looks like a coincidence. The nitty-gritty is the bug 4950. Right?
2): refquota doesn't account usedbysnapshot. Right?
3): In which condition, ["usedbydataset" != "referenced”] is true? (assuming no
descendent file systems and snapshots)
Thanks.
Fred
From: Fred Liu
Sent: 星期一, 十一月 17, 2014 19:41
To: 'Matthew Ahrens'
Cc: [email protected]; [email protected]
Subject: RE: [OpenZFS Developer] usedbydataset > refquota ?
Matt,
Thank you so much! ^--^.
See my comment below.
Fred
From: Matthew Ahrens [mailto:[email protected]]
Sent: 星期一, 十一月 17, 2014 15:52
To: Fred Liu
Cc: [email protected]; [email protected]
Subject: Re: [OpenZFS Developer] usedbydataset > refquota ?
On Sun, Nov 16, 2014 at 10:46 PM, Fred Liu <[email protected]> wrote:
We just met the case that usedbydataset is bigger than refquota. It prevents
users from removing files while the file system is full.
Do you have the fix for bug 4950?
commit 4bb73804952172060c9efb163b89c17f56804fe8
Author: Matthew Ahrens <[email protected]>
Date: Mon Jul 7 11:49:36 2014 -0800
4950 files sometimes can't be removed from a full filesystem
Reviewed by: Adam Leventhal <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed by: Sebastien Roy <[email protected]>
Reviewed by: Boris Protopopov <[email protected]>
Approved by: Dan McDonald <[email protected]>
[Fred]: Oh, the OS is a fairly old OpenSolaris 134b. I will check and test.
I guess it could come from quota setting(we set both quota and refquota).
Normally we have the equation -- “usedbydataset” = “userdata” + “metadata”.
Will refquota also constraint metadata?
All of these (used, usedby*, refer, quota, refquota) include metadata (e.g.
indirect blocks).
[Fred]: So “quota” overrides “refquota” as in my case? Otherwise the logic
should be {“used” < “referenced” < “refquota”} per this reply.
In this case, usedbydataset is only 98107 bigger than refquota(zfs get –Hp …).
FYI, the "refquota" property constrains the "referenced" property.
[Fred]: Ha! That is the place where this tiny delta resides.
--matt
It is really trivial if we don’t feed “-Hp”.
zfs get quota,refquota,usedbysnapshots,usedbydataset,used cn03/3/is8169am
NAME PROPERTY VALUE SOURCE
cn03/3/is8169am quota 55G local
cn03/3/is8169am refquota 50G local
cn03/3/is8169am usedbysnapshots 3.24G -
cn03/3/is8169am usedbydataset 50.0G -
cn03/3/is8169am used 53.2G -
For metadata is variable, I think it should not be accounted in refquota.
Correct?
Thanks.
Fred
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