[linux-lvm] system boot time regression when using lvm2-2.03.05
teigland at redhat.com
Mon Sep 9 14:09:56 UTC 2019
On Mon, Sep 09, 2019 at 11:42:17AM +0000, Heming Zhao wrote:
> Hello David,
> You are right. Without calling _online_pvscan_one(), the pv/vg/lv won't be actived.
> The activation jobs will be done by systemd calling lvm2-activation-*.services later.
> Current code, the boot process is mainly blocked by:
> dm_udev_wait <=== this point!
Thanks for debugging that. With so many devices, one possibility that
comes to mind is this error you would probably have seen:
"Limit for the maximum number of semaphores reached"
> For fix this boot time regression, it looks lvm2 should have a config item in lvm2.conf
> i.e.: large_PV_boot_speedup.
> When this item is 1, pvcan won't call _online_pvscan_one, then let lvm2-activation*.service
> do the active jobs.
> Is it a workable solution?
We should look into fixing the udev problems. I don't mind working around
udev when it won't do what we need; I'm not sure what the options are in
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