From: Eric Sandeen <sandeen@sandeen.net>
To: Alexander Tsvetkov <alexander.tsvetkov@oracle.com>,
Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: maxpct option for small xfs filesystems
Date: Tue, 27 Jan 2015 10:31:28 -0600 [thread overview]
Message-ID: <54C7BD60.5000104@sandeen.net> (raw)
In-Reply-To: <54C7BB78.4060203@oracle.com>
On 1/27/15 10:23 AM, Alexander Tsvetkov wrote:
...
> I have not the same results, just installed 3.19-rc6 and repeated the test.,
> df -i reports 640 inodes for filesystem, but actually created 40512 files:
>
> [root@fedora ~]# mkfs.xfs -f -d size=16m -i maxpct=1 /dev/sdb2
> meta-data=/dev/sdb2 isize=256 agcount=1, agsize=4096 blks
> = sectsz=512 attr=2, projid32bit=1
> = crc=0 finobt=0
> data = bsize=4096 blocks=4096, imaxpct=1
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0 ftype=0
> log =internal log bsize=4096 blocks=853, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
> [root@fedora ~]# mount /dev/sdb2 /mnt/scratch/
> fill with files until enospc...
> [root@fedora ~]# df -i /mnt/scratch/
> Filesystem Inodes IUsed IFree IUse% Mounted on
> /dev/sdb2 640 640 0 100% /mnt/scratch
> [root@fedora ~]# df -Th /mnt/scratch/
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/sdb2 xfs 13M 13M 156K 99% /mnt/scratch
> [root@fedora ~]# umount /mnt/scratch
> [root@fedora ~]# xfs_db -c "blockget -n" -c "ncheck" /dev/sdb2 | wc -l
> 40512
and what does df -i say after remount?
This is actually a problem with the lazy superblock counters I've run into before,
but haven't yet fixed. This kind of workload is such that it never trips the
runtime rebalancing.
> Looking into ncheck output there are 40512 pairs reported in the output each with own unique
> inode number. ncheck doesn't report inodes count by definition, but what does these
> 40512 reported inode numbers mean if only actually 640 inodes were allocated? From another hand
> each new file should have associated meta-data in the corresponding allocated inode structure, so for
> 40512 newly created files I expect the same count of allocated inodes, is it correct?
Recheck df -i after remount, I think you will see many more than 640.
-Eric
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next prev parent reply other threads:[~2015-01-27 16:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-26 16:14 maxpct option for small xfs filesystems Alexander Tsvetkov
2015-01-26 22:37 ` Dave Chinner
2015-01-27 16:23 ` Alexander Tsvetkov
2015-01-27 16:31 ` Eric Sandeen [this message]
2015-01-27 19:15 ` Eric Sandeen
2015-01-28 10:41 ` Alexander Tsvetkov
2015-01-28 15:44 ` Eric Sandeen
2015-01-28 18:05 ` Eric Sandeen
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