[linux-lvm] Question about thin-pool/thin LV with stripes

[Eric Ren <renzhengeek@gmail.com>]

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Hello,

I created thin LVs with 2 stripes on two PVs as follows:

```
lvcreate --yes --zero=n --type=thin-pool --name=mythinpool
--extents=90%FREE --chunksize=512K --poolmetadatasize=1G --stripes=2
--stripesize=4K vg0
...
# lvs -o+stripes -a
  LV                 VG  Attr       LSize    Pool       Origin Data%
Meta%  Move Log Cpy%Sync Convert #Str
  RootVolume         vg0 Vwi-a-t---   10.00g mythinpool        1.36
                               0
  [lvol0_pmspare]    vg0 ewi-------    2.00g
                              1
  mythinpool         vg0 twi-aot--- <175.77g                   0.08   0.79
                              1
  [mythinpool_tdata] vg0 Twi-ao---- <175.77g
                              2
  [mythinpool_tmeta] vg0 ewi-ao----    2.00g
                              1

# dmsetup table
vg0-mythinpool: 0 368607232 linear 252:2 0
vg0-RootVolume: 0 20971520 thin 252:2 1
vg0-mythinpool-tpool: 0 368607232 thin-pool 252:0 252:1 1024 71993 1
skip_block_zeroing
vg0-mythinpool_tdata: 0 368607232 striped 2 8 254:16 4458496 254:32 264192
vg0-mythinpool_tmeta: 0 4194304 linear 254:16 188762112
```

As you can see, only "mythinpool_tdata" LV has 2 stripes. Is that OK?
If I want to benefit performance from stripes, will it works for me? Or,
should I create dataLV, metadata LV, thinpool and thin LV using
step-by-step way
and specify "--stripes 2" in every steps?

Besides, is there anything I should take care of to extend the VG/thin-pool
with *striped thin-LV*
when out of space?

Any suggestion would be very appreciated, thanks in advance!

Regards,
Eric Ren

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