[linux-lvm] Maximum address used by a virtual disk on a thin pool.

[linux-lvm] Maximum address used by a virtual disk on a thin pool.

[Ilia Zykov]

Hello.
Tell me please, how can I get the maximum address used by a virtual disk
(disk created with -V VirtualSize). I have several large virtual disks,
but they use only a small part at the beginning of the disk. For example:

# lvs
  LV         VG  Attr       LSize   Pool     Origin Data%
  mylvm      CVG Vwi-aot--- 100,00g fastheap        7,13


Please advise me how to determine from which address the virtual disk
did not allocate real disk space? And all the data read from addresses
greater than this address will be exactly zeros. Or maybe, how can I get
map of the used chunks of disk?

Thanks.

----

Re: [linux-lvm] Maximum address used by a virtual disk on a thin pool.

[Gionatan Danti]

Il 13-06-2019 18:05 Ilia Zykov ha scritto:
> Hello.
> Tell me please, how can I get the maximum address used by a virtual 
> disk
> (disk created with -V VirtualSize). I have several large virtual disks,
> but they use only a small part at the beginning of the disk. For 
> example:
> 
> # lvs
>   LV         VG  Attr       LSize   Pool     Origin Data%
>   mylvm      CVG Vwi-aot--- 100,00g fastheap        7,13
> 
> 
> Please advise me how to determine from which address the virtual disk
> did not allocate real disk space? And all the data read from addresses
> greater than this address will be exactly zeros. Or maybe, how can I 
> get
> map of the used chunks of disk?
> 
> Thanks.

Maybe thin_dump[1] can help you?
Regards.

[1] https://linux.die.net/man/8/thin_dump

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
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Re: [linux-lvm] Maximum address used by a virtual disk on a thin pool.

[Zdenek Kabelac]

Dne 13. 06. 19 v 21:54 Gionatan Danti napsal(a):
> Il 13-06-2019 18:05 Ilia Zykov ha scritto:
>> Hello.
>> Tell me please, how can I get the maximum address used by a virtual disk
>> (disk created with -V VirtualSize). I have several large virtual disks,
>> but they use only a small part at the beginning of the disk. For example:
>>
>> # lvs
>> � LV�������� VG� Attr������ LSize�� Pool���� Origin Data%
>> � mylvm����� CVG Vwi-aot--- 100,00g fastheap������� 7,13
>>
>>
>> Please advise me how to determine from which address the virtual disk
>> did not allocate real disk space? And all the data read from addresses
>> greater than this address will be exactly zeros. Or maybe, how can I get
>> map of the used chunks of disk?
>>
>> Thanks.
> 
> Maybe thin_dump[1] can help you?
> Regards.
> 
> [1] https://linux.die.net/man/8/thin_dump

Hi

There is even better tool that can expose in 'great detail' ownership of
individual thin-pool chunks for each  thin volume - if that's what you
are looking for.  See  'man  thin_ls'

Regards

Zdenek