[linux-lvm] different stripesize on thinpool/thinlv

[Oliver Rath]

Hi List,

using different stripesize for Thinpools result 64kb stripesize for ThinLVs.

---------- snip ------------------

***@w541:/home/oliver# lvcreate -L 20G --thin-pool levg/mythinpool
levg /dev/sda4 --stripes 1 --stripesize 1024
WARNING: Sum of all thin volume sizes (7,64 TiB) exceeds the size of
thin pools and the size of whole volume group (901,17 GiB)!
For thin pool auto extension activation/thin_pool_autoextend_threshold
should be below 100.
Logical volume "mythinpool" created.
***@w541:/home/oliver# lvcreate --name fixi -V 10G -T levg/mythinpool
Using default stripesize 64,00 KiB.
Logical volume "fixi" created.

---------- snap ------------------

Odd thing:

The striping-Options should prepare multiple disk in parallel for the
thinpool. But then the ThinLV says "using 64kb stripe", although 1024MB
is set for thinpool.


My used versions:

***@w541:/home/oliver# lvcreate --version
LVM version: 2.02.171(2)-git (2017-04-13)
Library version: 1.02.140-git (2017-04-13)
Driver version: 4.35.0
Configuration: ./configure --enable-lvmetad
***@w541:/home/oliver# thin_check --version
0.7.0-rc6


Whats wrong here?

Tfh!

Regards,
Oliver

[Oliver Rath]

Hi List,

If I set in lvm.conf
----------------------------
metadata {
stripesize = 1024
}
----------------------------
it results in correct stripesize:
----------------------------
# lvcreate --name fixi3 -V 10G -T levg/mythinpool
Using default stripesize 1,00 MiB.
WARNING: Sum of all thin volume sizes (7,67 TiB) exceeds the size of
thin pools and the size of whole volume group (901,17 GiB)!
For thin pool auto extension activation/thin_pool_autoextend_threshold
should be below 100.
Logical volume "fixi3" created.
----------------------------
BUT
----------------------------
# lvcreate --stripesize 1024 --name fixi4 -V 10G -T levg/mythinpool
Command does not accept option: --stripesize 1024.
----------------------------
So setting stripesize in lvm.conf is allowed, in lvcreate
(thinpool-mode) not.

What is the right one?

Tfh!
Oliver

Post by Oliver Rath
Hi List,
using different stripesize for Thinpools result 64kb stripesize for ThinLVs.
---------- snip ------------------
levg /dev/sda4 --stripes 1 --stripesize 1024
WARNING: Sum of all thin volume sizes (7,64 TiB) exceeds the size of
thin pools and the size of whole volume group (901,17 GiB)!
For thin pool auto extension activation/thin_pool_autoextend_threshold
should be below 100.
Logical volume "mythinpool" created.
Using default stripesize 64,00 KiB.
Logical volume "fixi" created.
---------- snap ------------------
The striping-Options should prepare multiple disk in parallel for the
thinpool. But then the ThinLV says "using 64kb stripe", although 1024MB
is set for thinpool.
LVM version: 2.02.171(2)-git (2017-04-13)
Library version: 1.02.140-git (2017-04-13)
Driver version: 4.35.0
Configuration: ./configure --enable-lvmetad
0.7.0-rc6
Whats wrong here?
Tfh!
Regards,
Oliver
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