Date: Thu, 18 May 2017 19:36:55 +0000 From: kc atgb <kisscoolandthegangbang@hotmail.fr> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Different size after zfs send receive Message-ID: <DBXPR05MB157C1956B267EA6BE59F570A0E40@DBXPR05MB157.eurprd05.prod.outlook.com>
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Hi,
Some days ago I had a need to backup my current pool and restore it after p=
ool destroy and create.=20
The pool in my home server is a raidz1 with 4 disks. To backup this pool I =
grabbed two 4TB disks (single disk pools) to have a double backup (I have j=
ust one
sata port left I can use to plug a disk).=20
The whole process of backup and restore went well as I can say. But looking=
at the size reported by zfs list make me a little bit curious.=20
storage/datas/ISO 35=
420869824 381747995136 35420726976 /datas/ISO
storage/datas/ISO@backup_send =
142848 - 35420726976 -
storage/datas/ISO@backup_sync =
0 - 35420726976 -
b1/datas/ISO 3543930=
8800 2176300351488 35439210496 /datas/ISO
b1/datas/ISO@backup_send 9=
8304 - 35439210496 -
b1/datas/ISO@backup_sync =
0 - 35439210496 -
b2/datas/ISO 3543930=
8800 2176298991616 35439210496 /datas/ISO
b2/datas/ISO@backup_send 9=
8304 - 35439210496 -
b2/datas/ISO@backup_sync =
0 - 35439210496 -
storage/datas/ISO 35=
421024576 381303470016 35420715072 /datas/ISO
storage/datas/ISO@backup_send =
142848 - 35420715072 -
storage/datas/ISO@backup_sync =
11904 - 35420715072 -
storage/usrobj 5=
819085888 381747995136 5816276544 legacy
storage/usrobj@create =
166656 - 214272 -
storage/usrobj@backup_send =
2642688 - 5816228928 -
storage/usrobj@backup_sync =
0 - 5816276544 -
b1/usrobj 567508=
1728 2176300351488 5673222144 legacy
b1/usrobj@create 11=
4688 - 147456 -
b1/usrobj@backup_send 174=
4896 - 5673222144 -
b1/usrobj@backup_sync =
0 - 5673222144 -
b2/usrobj 567518=
8224 2176298991616 5673328640 legacy
b2/usrobj@create 11=
4688 - 147456 -
b2/usrobj@backup_send 174=
4896 - 5673328640 -
b2/usrobj@backup_sync =
0 - 5673328640 -
storage/usrobj 5=
820359616 381303470016 5815098048 legacy
storage/usrobj@create =
166656 - 214272 -
storage/usrobj@backup_send =
2535552 - 5815098048 -
storage/usrobj@backup_sync =
11904 - 5815098048 -
As you can see the numbers are different for each pool (the initial raidz1,=
backup1 disk, backup2 disk and new raidz1). I mean in the USED column. I h=
ave
nearly all my datasets in the same situation (those with fixed data that ha=
ve not changed between the beginning of the process and now). backup1 and b=
ackup2
are identical disks with exactly the same configurations and have different=
numbers. I used the same commands for all my transfers except the name of =
the
destination pool.=20
So, I wonder what can cause these differences ? Is it something I have to w=
orry about ? Can I consider this as a normal behavior ?=20
Thanks for your enlightments,
K.
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