Yes, but
If you increase your pool by adding a new vdev, your current data are
not auto-rebalanced. This will only happen over time with new or
modified data.
If you want the best performance then, you must copy over current data
ex by renaming a filesystem, replicate it to the former name and delete
it then.
Gea
Am 23.06.2017 um 17:19 schrieb Artyom Zhandarovsky:
So basically i need to add just more drives... ?
2017-06-23 18:09 GMT+03:00 Guenther Alka <a...@hfg-gmuend.de
<mailto:a...@hfg-gmuend.de>>:
The fragmentation info does not describe the fragmentation of the
data on pool but the fragmentation of the free space. A high
fragmentation value will result in high data fragmentation only
when you write or modify data.
https://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSZpoolFragmentationMeaning
<https://utcc.utoronto.ca/%7Ecks/space/blog/solaris/ZFSZpoolFragmentationMeaning>
So the best and only way to reduce data fragmentation is not to
fill up a pool say over 70-80%.
You should also know that CopyOnWrite filesystems where a complete
datablock ex 128k is written newly even if you change a "house" to
a "mouse" in a textfile are more vulnerable to fragmentation than
older filesystems. This is the price for the crash resitency where
a power outage during a write cannot lead to a corrupted
filesystem like with older filesystems where it can happen that
the data is modified "infile" while the according metadata update
is not happening. ZFS over-compensates this with its advanced
rambased read and write caches. A "defrag tool" is not available
for ZFS.
Gea
Am 23.06.2017 um 16:13 schrieb Artyom Zhandarovsky:
there any way to decrease fragmentation of dr_tank ?
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