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



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 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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