[OpenIndiana-discuss] ZFS improvements.

[Mark]

With WD EARS disks, since they do not expose the 4K size to the OS, 
there is not much to be gained with their internal 4k sector size.
Performance and reliability with these is also poor. The fixed, large 
TLER defaults cause constant dropouts, and I have found from experience 
that these disks don't work well with ZFS.

Mark.

On 24/11/2010 7:08 a.m., Jesus Cea wrote:
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> On 23/11/10 18:55, Maurilio Longo wrote:
>> maurilio at rsync:~$ ls -lR /nas/test/snv_143/ | wc -l
>> 175184
>>
>> At 2Kb, mean, per file, we have 360Mb, more or less, but here we go from
>> 2,73Gb to 3,81 so it is more than 1Gb, or, nearly 8Kb per file!
>
> If the znodes are 512 bytes too, they waste 3584 in a 4KB harddisk. So
> adding both you have extra 5632 bytes wasted per file.
>
> Do you use the same blocksize?. Same compression?.
>
> Anyway, I think that ZFS will try to align everything to 4KB, so it is
> going to waste space for every on-disk datastructure.
>
> - --
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