[linux-lvm] Mounted, but idle LVM volume causes constant disk writes

[Greg Zapp]

This is just a general stab, but has the filesystem been fully initialized
on those?  The default for ext4 is to do a lazy initialization of the
filesystem and journal when you create it.  Depending on the size of the
file system this can last for some time.  To prevent this use:
mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0

-Greg


On Tue, Jun 4, 2013 at 5:46 PM, Bostjan Skufca <bostjan at a2o.si> wrote:

> Hello,
>
> If LVM2 volume is mounted (ext4 fs), why is there constant write activity
> to the devices below (sw raid in this case) despite not using the mounted
> volume at all?
>
> I am seing this on multiple hosts. On this particular one I am seeing
> around 20 writes per second on average, but they occur in batches of around
> 50-90 writeIOps on every 3-4 seconds. If I mount the same filesystem (ext4)
> on sw raid1 without LVM in between, I see the expected 0 write IOps when
> not using the filesystem.
>
> Kernel versions where I noticed this: 3.0.13 (sysrescd) 3.4.1, 3.9.4
> (custom compiled). I noticed it on all systems where lvm is in use.
>
> Thank you for the hints,
> b.
>
>
> PS: I did search the web first, but I could not find the answer. Sorry if
> this has been answered before, maybe I was searching for the wrong terms.
>
>
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