Re: bcache not working on large files?

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Hi all,

> So with 8 threads doing random I/O of 4k blocks in a 1000 GB file
> results in IOPS in the range of about 20,000. The same setup with
> a file of 10,000 GB results in an IOPS of about 400. That is about
> the same rate the HDDs have without bcache. This is something I did
> not expect. It looks like bcache stopped to work at all...

I have to correct it: I rebuild the SSD-RAID and used now an RAID 0
instead of RAID 6 for caching. So now I get about 10.000 IOPS with
writing 4k blocks . I think this is 

   a) ok 

and 

   b) it is not a bcache problem

I suspect it is a problem of the raid controller, but I have no clue 
which one...

Probably it is a better decision to use a separate raid controller
for SSD (b)cache...

Best regards

Dirk

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