raid battery backup unit and on board memory

[muell]

Im looking on newegg at this 3ware card

http://www.newegg.com/Product/Produ...042&cm_re=9650SE-4LPML-_-16-116-042-_-Product

It says it has 256mb of on board memory. Would that protect the array in the event of a sudden power outage? Or would a separate batter card be needed like this?

http://www.newegg.com/Product/Produ...051&cm_re=RAID_BATTERY-_-16-116-051-_-Product

 

[axan]

you need bbu, without bbu any data that's buffered in raid's cache will be lost in the event of power interruption.

 

[Blue Fox]

UPS and BBU serve different purposes. Are you using write caching? If not, you can skip the BBU and just get a UPS.

 

[OldSchool]

The memory on raid cards is volatile, so without a BBU it will not be able to protect the data in the event of sudden power loss. However this is only important if you have write back cache enabled in the controller settings.

 

[pjkenned]

A general explanation of why you need a BBU for write back cache can be found in the Software RAID, Fake-RAID, Hardware RAID guide I put together last night.

 

[Red Falcon]

A general explanation of why you need a BBU for write back cache can be found in the Software RAID, Fake-RAID, Hardware RAID guide I put together last night.

I'm glad someone finally made something like this, thanks for sharing.

 

[pjkenned]

I'm glad someone finally made something like this, thanks for sharing.

Appreciate the kind words (that took me a long time to write). If you see any edits, please let me know.