1TB Flash in 3.5" size?
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From: trs80 on 7 Feb 2010 01:13 Does anyone yet make a TB Flash memory in a 3.5" drive physical format. If so, could you pass on a reference? The interface would need to support about at a 400MB/s sustained rate. I can work with any interface such as Fiber Channel or whatever . thanks for any tips
From: Arno on 7 Feb 2010 20:33 trs80 <trs80(a)yahoo.com> wrote: > Does anyone yet make a TB Flash memory in a 3.5" drive physical format. If > so, could you pass on a reference? The interface would need to support > about at a 400MB/s sustained rate. I can work with any interface such as > Fiber Channel or whatever . > thanks for any tips Nobody does and nobody gets that rate, not even for large accesses. Although some manufacturers have SATA3 drives planned with internal excessive multi channel architectures. For small accesses FLASH can be significantly slower than disks. For what you want, you may want to look at a traditional RAM fronted disk. Will be expensive though and definitely not available in 3.5". Alternatively you could build a RAID0 with a really fast controller and FLASH disks. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno(a)wagner.name GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
From: David Brown on 8 Feb 2010 07:38 Barry OGrady wrote: > On Sat, 6 Feb 2010 22:13:20 -0800, "trs80" <trs80(a)YAHOO.COM> wrote: > >> Does anyone yet make a TB Flash memory in a 3.5" drive physical format. If >> so, could you pass on a reference? The interface would need to support >> about at a 400MB/s sustained rate. I can work with any interface such as >> Fiber Channel or whatever . >> thanks for any tips > > Its not available yet, and remember flash ram is slow and has limited > read write cycles. > Flash drives are not normally considered "slow" - read performance of 200+ MB/s, and writes of maybe 70 MB/s are possible with good drives. That's a lot faster for reading than even top-range hard disks, and similar for writing (the OP doesn't specify if they want reading or writing speeds). I agree about the sizes - you don't get flash drives as big as 1 TB at the moment (at least, not in standard 3.5" formats). As for write endurance, you are about a decade out of touch... <http://www.storagesearch.com/ssdmyths-endurance.html>
From: David Brown on 8 Feb 2010 07:41 Arno wrote: > trs80 <trs80(a)yahoo.com> wrote: >> Does anyone yet make a TB Flash memory in a 3.5" drive physical format. If >> so, could you pass on a reference? The interface would need to support >> about at a 400MB/s sustained rate. I can work with any interface such as >> Fiber Channel or whatever . >> thanks for any tips > > Nobody does and nobody gets that rate, not even for large > accesses. Although some manufacturers have SATA3 drives > planned with internal excessive multi channel architectures. > For small accesses FLASH can be significantly slower than > disks. > > For what you want, you may want to look at a traditional RAM > fronted disk. Will be expensive though and definitely > not available in 3.5". Alternatively you could build a > RAID0 with a really fast controller and FLASH disks. > > Arno > There are a number of very fast drives available, but the cost is significant - a raid would be much more cost-effective. The biggest single drive I found in a quick check was: <http://www.plianttechnology.com/lightning_ls.php> That's 300 GB in 3.5" SAS, rated at 525/340 MB/s. Of course, for the fastest devices you use a PCI Express card with RAM rather than flash...
From: Arno on 8 Feb 2010 11:23 David Brown <david.brown(a)hesbynett.removethisbit.no> wrote: > Barry OGrady wrote: >> On Sat, 6 Feb 2010 22:13:20 -0800, "trs80" <trs80(a)YAHOO.COM> wrote: >> >>> Does anyone yet make a TB Flash memory in a 3.5" drive physical format. If >>> so, could you pass on a reference? The interface would need to support >>> about at a 400MB/s sustained rate. I can work with any interface such as >>> Fiber Channel or whatever . >>> thanks for any tips >> >> Its not available yet, and remember flash ram is slow and has limited >> read write cycles. >> > Flash drives are not normally considered "slow" - read performance of > 200+ MB/s, and writes of maybe 70 MB/s are possible with good drives. > That's a lot faster for reading than even top-range hard disks, and > similar for writing (the OP doesn't specify if they want reading or > writing speeds). Indeed. however a RAID0 with relatively cheap disks will give you 200+MB/s read and write speeds for large accesses. A 4-way RAID0 (possible at least with Linux software RAID and likely with the xBSDs as well) should reach 400MB/s large access speed. For small accesses the story is different, onlt a RAM frontend will reach this speed here, FLASH may be even slower than disk here, especially on write. > I agree about the sizes - you don't get flash drives as big as 1 TB at > the moment (at least, not in standard 3.5" formats). > As for write endurance, you are about a decade out of touch... > <http://www.storagesearch.com/ssdmyths-endurance.html> Well, not for USB flash. I did recently torture a 2GB Kingston USB to death and it had consistent data errors (with no error meassege to make matter worse!) after about 3500 full overwrites. Say the OP wants to overwrite his disk at 400MB/s, then 3500 full operwrites are reached after about 100 days of operation. I expect SATA FLASH is better, but not all may be. What however does not happen with modern FLASH is that writing a few 1000 times to a single location kills the drive. Traditional FLASH without wear leveling had that problem, with some dying after 10000...100000 writes to the same sector. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno(a)wagner.name GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
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