Computurd

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About Computurd

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  • Location
    Wichita, Ks
  • Interests
    Enterprise Storage, with a Major in SSDs.
  1. Good analysis, IBM seems to be limping off the field at this point.
  2. I agree, they definitely need to get more involved. There are so many benefits of SSD that to stay with HDD is just a waste, especially from a power perspective.
  3. Its important to remember that SSDs only account for 3% of the storage mix in the datacenter, possibly 4% if you are being generous. There are periods of time now where the fabs are placing orders on hold, simply because they cannot physically make more flash. We are currently having periodic NAND shortages every few months just trying to populate this tiny sliver of the datacenter capacity, with more severe flash shortages in the future being predicted by nearly all analysts. There is no way we can even scratch the capacity required to replace HDD with flash.
  4. I agree absolutely that those without Fabs are going the way of the dodo. They will have to differentiate on software offerings, but even that will wane as the companies with valuable software tech are vacuumed up by the fabs. HDDs imo are kind of like tape, they will just progress down the storage stack into lower and slower tiers. No doubt the performance tier is going to flash almost immediately, but I'm not sure about the capacity tier, at least for a longer period of time. Flash Forward (SanDisk/Tosh) have 2 fabs, Samsung has 3 with one being built, Micron has 3 and Hynix has 2. That is a long way from being able to support the EB capacity required. I personally think we will be on to ReRAM or some other memory tech before flash can supplant HDD.
  5. The issue is that in order to supply the amount of capacity to unseat hard drives it would require 75 more fabs. These weigh in at 10 billion apiece. There is simply no where near the capacity production to unseat HDDs, now or anytime within the forseeable future. Just one fab is a significant investment, and we do not see those popping up, except when necessary to replace older process fabs. They aren't actually increasing the number of fabs pumping out NAND, they are just replacing the old ones.
  6. The best advice I have ever received is to clone all of the drives in the RAID array before attempting a rebuild. This way, if your rebuild fails you can try again. Sorry such general advice...but i have no specific advice for that controller. Sounds like a freak occurrence (the worst kind!).
  7. Thanks for the detailed response. The level of granularity that you provide is excellent, and the idea of operating outside of file systems and their caching is a good way to eliminate possible performance variances. I enjoy your articles and the preconditioning graphs illustrate very well that you do a great job of getting the drives into steady state
  8. By utilizing the full LBA space, are you indicating that there is a file (or just data of some sort) written to the full LBA range? Or is the test just ran against the full LBA range while it is empty? Basically the gist of the question is whether there is a 100% fill level of the device (with data of some sort) when tested for the evaluation?
  9. Do you test with 100% fill on the SSD?
  10. Most SSDs for consumer use will retain data for at least five years, even though the spec for MLC requires 1 year of data retention without power. For SLC the spec requires 10 years. For enterprise the retention period has been shortened to 3 months.
  11. Yups has worked for many others. funny thing is that was what an intel feller advised on their forums. however, that has been many moons ago and i do not have the link. however, in storage 'circles' that is pretty widely used.
  12. little known fact: you can run winsat disk to force the OS to recognize an ssd. you had to do this with older ssd's that werent automatically detected by winders. elevate a cmd prompt to admin status type in: winsat disk this is the same utility used for wei scores, but more indepth. it is what it runs on installation. if it detects ssd, it will make the change
  13. unfortunately if it is like the Intel cards that are also LSI rebrands, it might be slow with firmware updates, and might not hit the performance of the LSI branded controllers. the intels have always had this problem, even though they are the exact same thing. that is why many users would crossflash the firmware, before they stopped allowing it.
  14. you cloned the drive is why. you need to do a new install. Win7 is going to optimize your system for SSD if it is detected during setup. if not, no dice. also, make sure you are running achi. ssd arent that great on ide. you can try to force win7 to kick over into 'ssd mode' by running winsat elevate cmd prompt type in: winsat disk this tests your disk using the same parameters as WEI, and is how the os identifies the SSD in the first place. one more thing of note. most laptops still are using sata 1. there is a place in there to unlock it to sata 2 in some laptops. in others you are bonered. there are even manufacturers who arent allowing sata 2 unless you buy the laptop with an SSD already installed! it was initially for the purpose of power saving, to not use sata 2 btw. you can google and find people complaining about sata1 on lappies all over. there are even some 'hacked' bios out there allowing sata 2 for certain lappies.