New SAS models added to WD’s enterprise lineup

Western Digital has expanded its line of enterprise-class Serial Attached SCSI hard drives. The 2.5″ S25, better known to enthusiasts as a sled-less VelociRaptor, has added 450 and 600GB capacities to go along with the 147 and 300GB models already available. All four capacities share the same 10,000-RPM spindle speed and 6Gbps SAS interface. However, the new models offer twice the cache (32MB) of their predecessors.

Speaking of new additions, WD has introduced a couple of SAS offerings in its 3.5″ RE family. The RE line has much in common with Caviar Black desktop drives, including a 7,200-RPM spindle speed and 32MB of cache. As the RE SAS name implies, the drives have 6Gbps Serial Attached SCSI interfaces, just like the S25. The RE’s larger 3.5″ form factor leaves room for quite a bit of additional capacity, though. Drives will be available in one- and two-terabyte capacities.

Like other RE models, the new SAS units undergo more stringent testing than desktop drives and incorporate RAID-specific features like RAFF (Rotary Acceleration Feed Forward) compensation for rotational vibration. Those perks also appear in low-power RE drives based on the Caviar Green. The 5,400-RPM RE-GP family hasn’t been upgraded to Serial Attached SCSI interfaces just yet, though.

Comments closed
    • DrDillyBar
    • 9 years ago

    600GB SAS 2.5? Sold.

    • chischis
    • 9 years ago

    Dealing with large amounts of data? Are fast WRITES a requirement? There’s still very much of a market for drives like this. Heck I wouldn’t mind one, stick it in a Scythe quiet drive enclosure, and it’ll be fine for a few hundred tracks of audio. 🙂

      • StashTheVampede
      • 9 years ago

      SAS drives don’t live all by themselves. They live to be with another dozen+ of their friends in the same cage!

    • StuG
    • 9 years ago

    I’m surprised, that with the price of such things the enterprise market hasn’t switched over to SSD’s entirely. Not only do they fail less, but give more overall performance. Possibly because they still wish to use all features of RAID? I’m not sure. >_<

      • kcarlile
      • 9 years ago

      Enterprise SSDs are the same order of magnitude more expensive than consumer as the HDs are.

      What surprises me is that these are just 10K. Many (most?) enterprise 2.5″ SAS drives are 15K these days.

        • StashTheVampede
        • 9 years ago

        These trade performance (15k) for larger sizes (1-2TB). Still plenty of room in the enterprise world for high capacity/good performing SAS drives. The enterprise may be the “last” place to switch everything over to SSD for a majority of their storage — platter drives will still be cheaper/larger for quite some time.

          • bcronce
          • 9 years ago

          To add to this, I would assume that TRIM would be a requirement to keep performance up on enterprise drives, but also the amount of testing involved before you can label a SAN “Enterprise Ready with TRIM support”.

          Enterprise customers are paranoid about data. They would rather pay more for something slower but tested than chance it with something new.

          My cousin went to purchase a 16PB SAN for his datacenter and the company he normally ordered from only had sold a 1PB. They said there is no reason why it shouldn’t work with 16PB, but my cousin will not purchase anything that hasn’t been tested for at least a year. This is standard with the other admins in his shop.

          They won’t even touch a file system until it has been stable for at least 5 years in enterprise environments. ZFS is what they use.

            • indeego
            • 9 years ago

            “They won’t even touch a file system until it has been stable for at least 5 years in enterprise environments. ZFS is what they use.”

            ZFS wasn’t even introduced until November 2005, which would make your statement rather strange, no?

            • Anomymous Gerbil
            • 9 years ago

            Surely if you’re buying something as big as a 16PB SAN, you’re going to be doing an RFP with several vendors, to get them fighting against each other re price, performance, features, delivery times, service / support etc?

      • DougG
      • 9 years ago

      Right now these SAS HDDs are more or less in the same ballpark $-per-GB-wise as consumer-grade MLC SSDs. But, you don’t want to use MLC SSDs in a 24/7 server that does any appreciable amount of writing. You’ll burn through the flash re-write limit in no time.

      … which is in addition to the concerns about reliability, power-safe write caches, etc, that you’d face in an enterprise/server environment.

      SLC SSDs are ready for the enterprise, but with their $/GB ratios orders of magnitude higher than both SAS HDDs and MLC SSDs, that’s still a niche product.

      Look for eMLC to be a game changer in the server world this year, at least for servers that only do light amounts of writing. (say, for example, up to 3 MB/sec sustained 24/7)

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