Re: [linux-lvm] Any way to speed up activation of volumes with snapshots?

[Chris Friesen <chris.friesen@windriver.com>]

On 09/16/2015 02:27 AM, Zdenek Kabelac wrote:
> Dne 16.9.2015 v 01:03 Chris Friesen napsal(a):

>> As a side question, currently we have a script which runs "vgchange -ay <vg>",
>> which will activate the VG.
>>
>> This script appears to activate the LVs within the VG serially rather than in
>> parallel.  Does it do any processing to determine in which order to activate
>> the LVs?

> What you can do with recent versions of lvm2 -  you could 'mark' (with lvchange
> --setskipactivation) some LVs to be skipped from normal activation.
> Then you could activate such skipped LVs with  'lvchange -ay -K'.
>
> As said lvm2 has not been designed for this case.
> (btw during whole activation - your access to VG is actually limited only for
> 'read-only')

Right...we're planning on testing out thin provisioning but I have to figure out 
a band-aid solution for products already in use.

Just to clarify...what does your "access to VG is actually limited only for 
'read-only'" mean exactly?

Does it mean:

1) I only have read-only access to the LVs within the VG until all LVs in the VG 
are activated?

or

2) I only have readonly access to the VG (so I can't add/remove/modify LVs) but 
I have read/write access to the LVs within the VG.


Thanks,
Chris