Battery backup unit for RAID controller?

Almost all true hardware raid controllers have BBUs. Without the BBU the controller defaults to not cache writes making random writes very slow or less than the performance of a single hard drive.
 
drescherjm said:
Almost all true hardware raid controllers have BBUs. Without the BBU the controller defaults to not cache writes making random writes very slow or less than the performance of a single hard drive.
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It may default to that, but I thought that you could override it and force it to use the cache normally even without the battery backup.

IT would explain why the backup units are do gosh darn expensive for what they are if you are FORCED to use the slower speed stuff without it. They kinda got you by the short hairs if you don't have a BBU if you can't override it in the settings.
 
You can force it to enabled yes. I did that recently with my ARC-1880i when I was building/filling my array. I then disabled it for reliability, but I do plan on getting a BBU...
 
Trogdor2012 said:
IT would explain why the backup units are do gosh darn expensive for what they are if you are FORCED to use the slower speed stuff without it. They kinda got you by the short hairs if you don't have a BBU if you can't override it in the settings.
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no it's not a conspiracy. what they're trying to avoid is people crying to tech support when they experience a sudden loss of power and the uncommitted data in the cache is lost. in areca's case of course they let you override that, but naturally write-caching without a BBU isn't defaulted on for the reason i mentioned.
 
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