[linux-lvm] pvmove and filesystem - un/mount?

[linux-lvm] pvmove and filesystem - un/mount?

[lejeczek]

hi users,

must be an easy one - what should be(is allowed to do) 
filesystem doing while there is a pvmove(failed hard disk) 
taking place in underlying LV?

many thanks,

L

Re: [linux-lvm] pvmove and filesystem - un/mount?

[Jarkko Oranen]

On 07/07/16 19:01, lejeczek wrote:
> hi users,
>
> must be an easy one - what should be(is allowed to do) filesystem 
> doing while there is a pvmove(failed hard disk) taking place in 
> underlying LV?
>
> many thanks,

Hi,

pvmove is generally transparent to the layers above, so you can continue 
using the system as usual while a pvmove is in progress. While I have 
never seen pvmove actually fail (My desktop encountered a power failure 
mid-operation once, and it just continued as if nothing had happened 
after rebooting), with a failing hard disk, I would avoid any additional 
IO while the operation is in progress.



--
Jarkko

Re: [linux-lvm] pvmove and filesystem - un/mount?

[lejeczek]

On 07/07/16 19:10, Jarkko Oranen wrote:
>
>
> On 07/07/16 19:01, lejeczek wrote:
>> hi users,
>>
>> must be an easy one - what should be(is allowed to do) 
>> filesystem doing while there is a pvmove(failed hard 
>> disk) taking place in underlying LV?
>>
>> many thanks,
>
> Hi,
>
> pvmove is generally transparent to the layers above, so 
> you can continue using the system as usual while a pvmove 
> is in progress. While I have never seen pvmove actually 
> fail (My desktop encountered a power failure mid-operation 
> once, and it just continued as if nothing had happened 
> after rebooting), with a failing hard disk, I would avoid 
> any additional IO while the operation is in progress.
>
>
ok, thanks
maybe a bit more tricky, would now downsizing a FS be one 
thing OK to do(probably also fsck) ? while pvmove is working?
furthermore, would lvreduce be OK to take pvmote out of a LV ?

I have a bit of puzzle type of situation here to deal with - 
started pvmove but seems that HDD is rather in a bad 
condition for after two days pvmove is barely at 4%.
Should I let it finish - or - abort pvmove and try fsck; 
fsreduce; lvreduce..
hmmm..

>
> -- 
> Jarkko
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] pvmove and filesystem - un/mount?

[Marian Csontos]

On 07/08/2016 11:03 AM, lejeczek wrote:
>
>
> On 07/07/16 19:10, Jarkko Oranen wrote:
>>
>>
>> On 07/07/16 19:01, lejeczek wrote:
>>> hi users,
>>>
>>> must be an easy one - what should be(is allowed to do) filesystem
>>> doing while there is a pvmove(failed hard disk) taking place in
>>> underlying LV?
>>>
>>> many thanks,
>>
>> Hi,
>>
>> pvmove is generally transparent to the layers above, so you can
>> continue using the system as usual while a pvmove is in progress.
>> While I have never seen pvmove actually fail (My desktop encountered a
>> power failure mid-operation once, and it just continued as if nothing
>> had happened after rebooting), with a failing hard disk, I would avoid
>> any additional IO while the operation is in progress.
>>
>>
> ok, thanks
> maybe a bit more tricky, would now downsizing a FS be one thing OK to
> do(probably also fsck) ? while pvmove is working?
> furthermore, would lvreduce be OK to take pvmote out of a LV ?
>
> I have a bit of puzzle type of situation here to deal with - started
> pvmove but seems that HDD is rather in a bad condition for after two
> days pvmove is barely at 4%.
> Should I let it finish - or - abort pvmove and try fsck; fsreduce;
> lvreduce..
> hmmm..

Use ddrescue. pvmove is not intended for data rescuing from failing disks.

ddrescue is using different strategy to quickly read whatever it can, 
quickly skipping over any failing regions, attempting to recover those 
on later iterations.

-- Martian



>
>>
>> --
>> Jarkko
>>
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm@redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/