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 pool destroy and create. 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 just one sata port left I can use to plug a disk). 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. storage/datas/ISO 35420869824 381747995136 35420726976 /datas/ISO storage/datas/ISO@backup_send 142848 - 35420726976 - storage/datas/ISO@backup_sync 0 - 35420726976 - b1/datas/ISO 35439308800 2176300351488 35439210496 /datas/ISO b1/datas/ISO@backup_send 98304 - 35439210496 - b1/datas/ISO@backup_sync 0 - 35439210496 - b2/datas/ISO 35439308800 2176298991616 35439210496 /datas/ISO b2/datas/ISO@backup_send 98304 - 35439210496 - b2/datas/ISO@backup_sync 0 - 35439210496 - storage/datas/ISO 35421024576 381303470016 35420715072 /datas/ISO storage/datas/ISO@backup_send 142848 - 35420715072 - storage/datas/ISO@backup_sync 11904 - 35420715072 - storage/usrobj 5819085888 381747995136 5816276544 legacy storage/usrobj@create 166656 - 214272 - storage/usrobj@backup_send 2642688 - 5816228928 - storage/usrobj@backup_sync 0 - 5816276544 - b1/usrobj 5675081728 2176300351488 5673222144 legacy b1/usrobj@create 114688 - 147456 - b1/usrobj@backup_send 1744896 - 5673222144 - b1/usrobj@backup_sync 0 - 5673222144 - b2/usrobj 5675188224 2176298991616 5673328640 legacy b2/usrobj@create 114688 - 147456 - b2/usrobj@backup_send 1744896 - 5673328640 - b2/usrobj@backup_sync 0 - 5673328640 - storage/usrobj 5820359616 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 have nearly all my datasets in the same situation (those with fixed data that have not changed between the beginning of the process and now). backup1 and backup2 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. So, I wonder what can cause these differences ? Is it something I have to worry about ? Can I consider this as a normal behavior ? Thanks for your enlightments, K.
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