Re: Some very basic questions

[Avi Kivity <avi@redhat.com>]

jim owens wrote:
>>> For most SATA drives, disabling write back cache seems to take high
>>> toll on write throughput.  :-(
>>
>> I measured this yesterday.  This is true for pure write workloads; 
>> for mixed read/write workloads the throughput decrease is negligible.
>
> Different tests on different hardware
> give different results at different times!
>

True.  But data loss is forever!

>>
>> I got flamed for this on another list, but let's disable the write 
>> cache and live with the performance drop.
>
> We don't get to decide this, customers do.

We get to pick the defaults.

> As they say in the raid forum... fast, cheap, good - pick any 2

We can upgrade slow to fast, but !good gets upgraded to another fs.

> P.S. no flames because we chose no-battery == disable-write-cache

ACK!

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.