On 10/28/2016 09:21 AM, Eneko Lacunza wrote:
Hi,
El 27/10/16 a las 15:07, Frank Thommen escribió:
I also need the battery for smart arrays?
If you do not plan to use ZFS, which sort of nullifies the use of a
RAID controller, then yes. If you care for your data a BBU is
absolutely vital and will give you a noticeable performance boost.
I understand that BBU improves performance, but in what way does it
"care for your data - absolutely vital"?
My understanding is that in fact it does add some risk to your data if
RAID controller fails - bye bye write cache data!
The BBU will store your unwritten cached data in case of a power
failure and write it down after power has been restored. W/o BBU, you
would loose that data completely. Of course, if you don't use cache,
you also don't need the BBU ;-)
Sure, but BBU is not vital for data care. If you want performance, you
need BBU, but you can safely use write-through without BBU. BBU does not
improve the consistency of your data.
Your argumentation is not completely correct: If you want performanace,
you need caching (not BBU). And if you use caching, you should really,
really use BBU (your RAID controller might not even allow caching w/o
BBU anyway)
And yes ist does improve data consistency very much: In the case of a
power failure.
frank
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