[OmniOS-discuss] Fragmentation

[Artyom Zhandarovsky]

So basically i need to add just more drives... ?

2017-06-23 18:09 GMT+03:00 Guenther Alka <alka at 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/ZFSZpoolFra
> gmentationMeaning
> 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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