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Message-ID: <4C9D640E.5020609@sm-wg.net> Date: Sat, 25 Sep 2010 03:53:02 +0100 From: Bernhard Rohrer <graylion@...wg.net> To: linux-ext4@...r.kernel.org Subject: ext4 blocksize peculiarities Hi all I have a 3.3 TB partition (yes really) that is formatted with ext4 and 4 kiB blocks. What little data I have on that appears to use up an extraordinary amount of space, so I had a closer look. root@...collab:/home/adminlion# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/primary_vg-primary_var 3.5T 43G 3.3T 2% /var we see that 43 GiB appear to be taking up something that gets rounded to 200 GiB if we look at: root@...collab:/home/adminlion# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/primary_vg-primary_var 3696706360 44362800 3464561624 2% /var now 44362800 4k blocks are 169.23 GiB, which does indeed round to 200 GiB. similar usage also gets reported when I get the properties of the share via cifs. debugfs shows: Block count: 937689088 Reserved block count: 46884454 Free blocks: 912175341 so while df shows 4 times as many available 1k blocks as debugfs, which after all shows the actual number of 4k blocks, both are more or less in agreement as to the space used. This leads me to believe that somehow only 1k of every 4k block gets used. Now i could of course reformat to 1k blocks, but I'd prefer to avoid that. OS is Lucid64 and the volume is a LVM volume. Has anybody seen this before? Uncle Google was rather mum on the subject. cheers Bernhard -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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