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From: Zdenek Kabelac <zkabelac@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>,
	Oliver Rath <rath@mglug.de>
Subject: Re: [linux-lvm] mixed ssd/disk szenario question: moving lv from ssd ->disk?
Date: Thu, 27 Nov 2014 10:27:26 +0100	[thread overview]
Message-ID: <5476EE7E.3070501@redhat.com> (raw)
In-Reply-To: <5471C959.7020301@mglug.de>

Dne 23.11.2014 v 12:47 Oliver Rath napsal(a):
> Hi Matthew,
>
> i have to correct my last email: This works also with thinpool-lvs!
> Better said: There was no error message executing  this command. Will
> walk on this way for more reults. Maybe the lvconvert-manpage is outdated?
>
> Tfh!
> Oliver

Hi


I'm somehow missing the point here.

Could you please show us  'lvs -a -o+seg_pe_ranges'

Normally when you make a thin volume snapshot, the snapshot is sharing your 
blocks within thin-pool.  So no space is allocated on any SSD for this.
(And you cannot specify which block will be used in a thin-pool)

If you would be using 'old-snapshot' which does allocate 'extra' space for COW 
block -then you would probably see horrible performance with 200 snapshots...

And finally - standard command for moving extents around in a VG is - 'pvmove'.


Regards

Zdenek

      reply	other threads:[~2014-11-27  9:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-18 16:28 [linux-lvm] mixed ssd/disk szenario question: moving lv from ssd ->disk? Oliver Rath
2014-11-18 16:55 ` matthew patton
2014-11-23 11:42   ` Oliver Rath
2014-11-23 11:47   ` Oliver Rath
2014-11-27  9:27     ` Zdenek Kabelac [this message]

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