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From: Stefan Ring <stefanrin@gmail.com>
To: dm-devel@redhat.com, ejt@redhat.com
Subject: Re: Significantly dropped dm-cache performance in 4.13 compared to 4.11
Date: Tue, 14 Nov 2017 15:53:40 +0100	[thread overview]
Message-ID: <CAAxjCExB=PaDrAxqdi-=pRRraPZyq7Wu5WX==hGv7or=ZDx7Jg@mail.gmail.com> (raw)
In-Reply-To: <20171114110046.6lmv34rqngs6pjwf@reti>

On Tue, Nov 14, 2017 at 12:00 PM, Joe Thornber <thornber@redhat.com> wrote:
>
> I'm not sure what's going on here.  Would you mind sending me the
> metadata please?  Either a cache_dump of it, or a copy of the metadata
> dev?

I'd like to create a cache dump, but I'm not very experienced with
this stuff. I do:

$ cache_dump /dev/vg_zfs/lv_zfsdisk |less
syscall 'open' failed: Device or resource busy
Note: you cannot run this tool with these options on live metadata.

Which is what I feared/expected. However, after doing

$ lvchange -an vg_zfs/lv_zfsdisk

the device disappears, and I cannot run cache_dump on it as well. So
how do I make it not live, while still visible?

  reply	other threads:[~2017-11-14 14:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-03 18:50 Significantly dropped dm-cache performance in 4.13 compared to 4.11 Stefan Ring
2017-11-07 14:41 ` Joe Thornber
2017-11-09 15:15   ` Stefan Ring
2017-11-13 17:31     ` Stefan Ring
2017-11-13 19:01       ` Mike Snitzer
2017-11-14 11:00         ` Joe Thornber
2017-11-14 14:53           ` Stefan Ring [this message]
2017-11-14 18:41           ` Stefan Ring
2017-12-15 16:03         ` Stefan Ring

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