[Bioclusters] mid range storage solutions

Mark Hahn hahn at mcmaster.ca
Sun Sep 30 10:55:21 EDT 2007

>  32TB in a Raid 10 configuration in 7U of rack space and fast disks (I
>assume you mean at least 10Krpm) is not going to happen!

it was unclear to me from the post whether 32T was before raid overhead or
after.  even so, for conventional front-mounted (hotswap) disks, the max 
density is around 6/u, and not all vendors support 1TB disks yet.  so 
6disks * .75 TB/disk * 7U = 31.5TB still < 32TB.

I'm not sure "fast" necessarily implies 10K/fc/sas for this application.
raid10 will give excellent concurrency for DB loads where the chunk size
is tuned to the DB's preferred block size.  it's always been possible to 
obtain high aggregate IOPS this way, rather than pushing lower rotational

regards, mark hahn.

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