Adding new hard drives with different cache size than current drives.

lurn

Honorable
Jun 18, 2012
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10,530
Hello,

I currently have an older server (built back around 2009) with RAID5 array.

The raid controller is a 3ware 9650SE-8LPML. It allows for SATA II drives to be connected to it.

The current hard drives in my RAID5 array are 5 of these:

http://www.newegg.com/Product/Product.aspx?Item=N82E16822148108

We want to add some additional storage. We have room for at least 3 more disks on the raid controller. Of course, they are hard to come by now.

I was thinking of possibly purchasing this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16822136697

But I was concerned with having this having a much larger cache of 64 mb as opposed to 16mb cache for the drives in my current setup. Would this affect my array? Could problems arise if I do this?

I have a Supermicro x8da3 motherboard.

http://www.supermicro.com/products/motherboard/qpi/5500/x8da3.cfm


I was thinking if connecting the new drives to the raid array was an option,I could connect the new drives to the motherboard?


Any suggestions or help would be appreciated.

thanks,

lurn
 
Solution
Mixing cache sizes with otherwise similar disks should not cause a problem. Yes, RAID should, in theory, be done with identical disks, but many RAID drives have failed and been replaced with different models.