Re: SSD usage for bcache - Read and Writeback

[Emmanuel Florac <eflorac@intellique.com>]

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Le Thu, 14 Sep 2017 10:10:09 -0300
FERNANDO FREDIANI <fernando.frediani@upx.com> écrivait:

> If the users reads a piece of data that is just writen to SSD
> (unlikely) it should first and in any condition be commited to the
> permanent storage and then read from there and cached in another area
> of the SSD. Writaback cache is very volatile and lasts only a few
> seconds while the data is not yet committed to permanent storage.
> 
> In fact multiple device suport is not implemented yet, that's why I
> am asking it and comparing with other well technology as ZFS.
> 

However nothing in bcache prevents you from using for instance a RAID
of SSDs as a cache device. Actually for write caching it's mandatory
IMO. 

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