From: Stan Hoeppner <stan@hardwarefreak.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: xfs@oss.sgi.com
Subject: Re: higher agcount on LVM2 thinp volumes
Date: Thu, 29 Aug 2013 20:44:20 -0500 [thread overview]
Message-ID: <521FF8F4.9040009@hardwarefreak.com> (raw)
In-Reply-To: <321D1F95-5603-4571-A445-A267DA5F670F@colorremedies.com>
On 8/29/2013 1:09 AM, Chris Murphy wrote:
>
> Is it expected when formatting, using defaults, that a thinp volume compared to either a conventional LV or partition of the same size, should have a higher agcount?
>
>
> HDD, GPT partitioned, 100GB partition size:
>
> [root@f19s ~]# mkfs.xfs /dev/sda7
> meta-data=/dev/sda7 isize=256 agcount=4, agsize=6553600 blks
> = sectsz=512 attr=2, projid32bit=0
> data = bsize=4096 blocks=26214400, imaxpct=25
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0
> log =internal log bsize=4096 blocks=12800, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
>
>
> A 400GB partition, made into PV, PV added to VG, and all extents put into a thinpool volume, a 100GB virtual sized LV:
>
> [root@f19s ~]# mkfs.xfs /dev/mapper/vg1-data
> meta-data=/dev/mapper/vg1-data isize=256 agcount=16, agsize=1638400 blks
> = sectsz=512 attr=2, projid32bit=0
> data = bsize=4096 blocks=26214400, imaxpct=25
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0
> log =internal log bsize=4096 blocks=12800, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
>
>
>
> I get agcount=4 on a conventional LV as well. Why agcount=16 on thinp?
More information would be helpful, specifically WRT the device stack
underlying mkfs.xfs. I.e. we need to know more about the LVM configuration.
See:
http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F
--
Stan
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next prev parent reply other threads:[~2013-08-30 1:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-29 6:09 higher agcount on LVM2 thinp volumes Chris Murphy
2013-08-30 1:44 ` Stan Hoeppner [this message]
2013-08-30 2:08 ` Chris Murphy
2013-08-30 2:58 ` Dave Chinner
2013-08-30 3:21 ` Chris Murphy
2013-08-30 3:38 ` Dave Chinner
2013-08-30 17:55 ` Chris Murphy
2013-08-31 1:22 ` Eric Sandeen
2013-09-01 3:39 ` Chris Murphy
2013-08-30 3:04 ` Eric Sandeen
2013-08-30 3:18 ` Chris Murphy
2013-08-30 3:19 ` Eric Sandeen
2013-08-30 3:24 ` Chris Murphy
2013-08-30 3:29 ` Chris Murphy
2013-08-30 3:35 ` Eric Sandeen
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