On 26/08/2009 12:29, Jon Hardcastle wrote: [...]
I did look into bitmaps *abit* i could easily have the imagine for my 6 drive raid 5 stored on the raid1 I have in the same system.. The googling I did tho did not paint a pretty picture it talked about huge performance hits?
There is a performance hit but it can be minimised by picking a bitmap chunk size to suit; I ended up getting about 80% of bitmap-less write performance using a 16MB bitmap chunk size instead of about 40% with the default size, on my 3-drive RAID-5 array.
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