• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1635
  • Last Modified:

difference between controller cache module and battery-backed write cache (BBWC) module

what is the difference between controller cache module and battery-backed write cache (BBWC) module?
  • 2
1 Solution
Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
The difference between a BBWC and a FBWC is not the difference between a BBWC and a "controller cache module". Indeed there may be no difference at all.

BBWC is fairly well defined, it is cache memory that has a battery backup so that the contents are not lost during brief power outages, the server may be powered off for a day or so and when power is restored the cache contents are flushed to disk.

Controller cache module is less well defined, it may be battery backed, it may be flash backed or it may have no backup against power loss. To be more accurate you will have to give us the part number or the exact context (an URL for example) of where you saw the term.
BBWC is write cache. The "controller cache" is typically read cache.  Losing the read cache would be a minor performance hit, and of zero risk of data loss.   Losing write cache before that data is flushed to disk COULD result in data loss and/or RAID inconsistency.
That's not necessarily correct either, without knowing exactly what the document or whatever it is that  okamon is referring to it is impossible to tell.

Take this for example, the exact words are "Removing and Replacing the Controller Cache Module" and yet it is referring to a BBWC.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Easily Design & Build Your Next Website

Squarespace’s all-in-one platform gives you everything you need to express yourself creatively online, whether it is with a domain, website, or online store. Get started with your free trial today, and when ready, take 10% off your first purchase with offer code 'EXPERTS'.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now