[Tig] 1Tb & 2Tb Raid disks, what make/model?

Michael Bittle mlbnyc at verizon.net
Mon Mar 7 22:32:53 GMT 2011

on the wires today:

Western Digital To Buy Hitachi's Storage Technology Unit For $4.3 Bln - Update




On Mar 7, 2011, at 12:46 AM, Jean-Francois Panisset wrote:

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> Since you are talking about 1TB/2TB drives, I'm guessing you have
> ruled out 15K RPM SAS drives are and going with 7200RPM SATA drives.
> For a disk array holding production data, I would certainly suggest
> sticking with "enterprise" grade SATA drives rather than
> consumer/desktop models. In particular, enterprise drives are designed
> to be hosted in an array with multiple other drives, and thus not be
> as affected by harmonic vibrations from all the other drives. I you
> want to see an example of how drives are affected by vibrations, check
> out this Sun dude screaming at his disk array:
> http://blogs.sun.com/brendan/entry/unusual_disk_latency
> Typically, enterprise-grade SATA drives comes from either Seagate or Hitachi:
> For Seagate 3.5" Constellation ES drives:
> http://www.seagate.com/www/en-us/products/enterprise-hard-drives/constellation-es/
> They apparently also now have 2.5" drives up to 1TB in the Constellation line:
> http://www.seagate.com/www/en-us/products/enterprise-ssd-hdd/constellation
> Something to consider is getting drives "nearline drives with a SAS
> interface", sometimes called "fat sas" drives: the advantage is that
> you don't have to add "interposer" dongles to the drives to get dual
> porting, so that's one less piece of electronics that can break. It is
> also said that since the SAS protocol is more efficient than the SATA
> protocol, you can get a bit more performance from the same mechanicals
> with a SAS interface than with a SATA interface. Also, recent drives
> will have 6 gbit/sec SAS interfaces, so it might be interesting to
> look at the Atto R680 controller which supports 6gbit/sec SAS ports.
> The R380 has 8 3 gbit/sec ports, which should be plenty for 20 drives,
> but if you ever plan to hang daisy chain more storage, building a 6
> gbit/sec solution might make sense.
> Equivalent drives from Hitachi would be the UltraStar 7K3000, which is
> also available in 3TB models if you get really greedy:
> http://www.hitachigst.com/internal-drives/enterprise/ultrastar/ultrastar-7k3000
> Western Digital is also now in the enterprise drive business, but I
> haven't had any experience with their drives yet:
> http://www.wdc.com/en/products/products.aspx?id=30
> JF
> On Sun, Mar 6, 2011 at 6:51 PM, Robert Houllahan <rob at cinelab.com> wrote:
>> Hey
>> I am going to populate a 20 disk array relatively shortly and while I have not decided to make a 20Tb or 40Tb array I was wondering what drives people are using for populating disk array systems these days. The controller is a Atto R380 and the box is a 20 disk SAS backplane style setup. I am thinking that a Astek 33606 SAS expander for the box but I would be curious to know the thoughts about SAS expanders as well.
>> The Array is for a DaVinci Resolve on OSX box which I am currently running on a Rocket-Raid 2214 Sata controller.
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