Re: support for external persistent cache

[Roberto Spadim <roberto@spadim.com.br>]

please check my email =)
let´s end this email?

2011/1/19 Cory Coager <ccoager@gmail.com>:
> On Wed, Jan 19, 2011 at 03:15:40PM -0200, Roberto Spadim wrote:
>> hummm....
>> thinking again.....
>>
>> what?s the today raid1 problem?
>> it?s based on minimal disk size
>> for example...
>> /dev/sda 1gb
>> /dev/sdb 1tb
>> we can have a 1gb raid only
>>
>> what you want is:
>> 1tb raid0
>> with a automatic /dev/sda to /dev/sdb write
>>
>>
>> could we call this raid0-cache?
>> i think we could implement it in raid....
>>
>> check this fuse (filesystem) implementation: http://www.furquim.org/chironfs/
>> it?s based on filesystem (ok it?s a raid1, not a cache like, but?s
>> limited to max filesystem size, not the minimal filesystem size... ok
>> it?s not secure to use it since small filesystem don?t have all
>> information, but?s nice)
>>
>> anyone want to make raid0-cache implementation?
>
> I have two comments on this.
>
> I don't think the cache device should be the same size as your
> disk storage.  It should be a small cache size similar to
> hardware RAID.
>
> Also, we'd need a way to flush the data from the cache device
> on bootup.
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-- 
Roberto Spadim
Spadim Technology / SPAEmpresarial
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