From: Zdenek Kabelac <zkabelac@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Cpy%Sync column - high disk activity after reboots
Date: Mon, 01 Jun 2015 10:58:16 +0200 [thread overview]
Message-ID: <556C1EA8.8000208@redhat.com> (raw)
In-Reply-To: <877frou7fa.fsf@bluescreen303.nl>
Dne 31.5.2015 v 16:51 Mathijs Kwik napsal(a):
> Hi all,
>
> I'm trying lvmcache and it seems to work ok. However, after every
> reboot, I notice quite a long period of disk activity. lvs gives me this
> output:
>
> % lvs
> LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
> btrfs-spinner bluebook Cwi-aoC--- 582,19g [cache] [btrfs-spinner_corig] 70,11 11,34 82,55
>
> The % gets lower over time and when it reaches 0 the disk activity goes
> back to normal.
>
> Is this to be expected/normal?
> It seems to me the entire cache is checked as if it wasn't cleanly
> closed on shutdown. I'm currently using writethrough and would like to
> make sure everything is ok before enabling writeback.
Hi
Cache is always flushing it's content to disk - so if you have the 'writeback'
variant and there were some unwritten data which sits only in cache, they are
automatically pushed to origin (cached) device - which is likely your disk
activity.
Zdenek
next prev parent reply other threads:[~2015-06-01 8:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-31 14:51 [linux-lvm] Cpy%Sync column - high disk activity after reboots Mathijs Kwik
2015-06-01 8:58 ` Zdenek Kabelac [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-06-02 7:35 Mathijs Kwik
2015-06-02 11:58 ` Zdenek Kabelac
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