On 04/15/2016 06:11 PM, Nick Knutov wrote:
I think I saw it in the wiki but was unable to find now
How to create ploop CT with vzctl create using smaller ploop block
size then defaut 1MB ? Can I change it in some config file?
This functionality is not available from vzctl, but if you create ploop
using "ploop init"
you can use -b argument to specify ploop block size. Here's an excerpt
from ploop(8)
man page:
Basic commands
init
Create and initalize a ploop image file and a corresponding
DiskDe‐
scriptor.xml file.
ploop init -s size [-f format] [-v version] [-t fstype] [-b
blocksize]
[-B fsblocksize] [--nolazy] delta_file
....
-b blocksize
Device block size, in 512 byte sectors. Default
block size
is 2048 sectors, or 1 megabyte.
....
So, you can experiment with various block sizes and share your findings
with us.
I played with it a bit, but I was mostly interested in metadata overhead
for small
(read empty) deltas, and found out that the block size of 512KB is a bit
better
in that regard than the default 1M block size. Having said that, I
haven't done
any performance comparisons -- obviously, block size should have noticeable
performance impact.
Kir.
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