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  1. S

    SSD vs Raptor

    I guess you misunderstood. I meant that you only need backups to protect against URE for the last ~7 years, not before. Simple math of probability. This has nothing to do with the need for backups to protect against disk failure. URE and disk failure should not be confused. A URE is commonly...
  2. S

    SSD Reliability these days...

    Are you sure that is correct? As far as I recall, the internal SRAM is used for write-back, while external DRAM is (optionally) used for caching of the mapping tables. I could be wrong on Sandforce though, but at least this applies to other controllers like Intel X25-M, 320, S3500/S3700...
  3. S

    ZFS - the next generation of data storage

    I don't understand this. Because ZFS runs on UNIX people discard this. But people use Linux on their phones, and Mac OSX is built on FreeBSD. I don't hear them complaining. Even Synology - as well as most off-the-shelf NAS appliances - runs Linux. Of course the geeky world remains hidden from...
  4. S

    ZFS - the next generation of data storage

    Why would home users need End to End protection? Yes to protect their backups from contamination. But, what if you use ZFS send/receive for that? The fun thing is, RAID was supposed to provide reliable storage using cheap hardware. Hence the I of Inexpensive in the acronym RAID, though often...
  5. S

    Seagate Desktop HDD.15 ST4000DM000

    The ST4000VN000 would appear to be a bit newer, and also sports 5400rpm-class which is preferable for mass storage. Today, the regular Greens and Reds will get you 1000GB platter capacity. I believe the first 5TB drive with 4x 1250GB platters was also announced a while back. To lazy to google...
  6. S

    ZFS - the next generation of data storage

    It shocks me to see only one thread of the last 10 pages here on AnandTech are related to ZFS. Are you guys so old-fashioned, or hasn't the word reached Anand that ZFS provides reliable storage and modern features? Are there people using RAID here who do not know what ZFS is? Impossible...
  7. S

    SSD Reliability these days...

    The issues can never be resolved because they are - in part - inherent to the design of the Sandforce controller. Due to the deduplication functionality, this SSD controller will always have an additional point of failure others SSDs don't have. Other SSDs only have a weakness in the unprotected...
  8. S

    Terrible RAID 5 performance after upgrade

    Show us the data! With data we can give you better advice. You're probably using Intel RST RAID; so next time include this very important information in your thread. I'd also like to see SMART attributes of your drives, gathered with CrystalDiskInfo for example. A screenshot of AS SSD would be...
  9. S

    SSD vs Raptor

    I would dispute that. They just have so low data density that uBER is not a problem for those drives. Only recent (~7 years) drives have problems with uBER and that's the reason they are not reliable enough to be used without redundancy and without backup.
  10. S

    Just a queston regarding storage decisions

    What you have is great. A bigger SSD just means lots of spent (wasted) money. Buy a bigger 4TB harddrive for the needs for the coming years if you like. 128GB SSD will be sufficient to hold your operating system and appliations and maybe a game or two. That's all you need. Harddrives are more...
  11. S

    Seagate Desktop HDD.15 ST4000DM000

    I'd recommend against the Seagate 7200.14. A friend of mine which owns these drives complains about regular clicking sounds due to background scanning looking for bad sectors. The power consumption is also much higher than that of competitor drives. It also runs 7200rpm. Depending on your...
  12. S

    crucial m500 vs samsung evo

    The 5000-hour bug was present in early firmwares of the Crucial M4 SSD. The M500 doesn't have this bug and appears to have a low failure rate. However, the same is true for some other SSDs. The M500 just has an edge over its current mainstream competitors when it comes to data protection.
  13. S

    crucial m500 vs samsung evo

    Very true. However, you seem to imply that when using an Uninterruptable Power Supply (UPS) you do not need capacitor protection. This is, however, not true. A UPS prevents power from going down in most cases. But the problem is much deeper than that. The SSD must receive a command (ATA standby...
  14. S

    TRIM in RAID-0 on ICH9R? Any hope?

    Not sure how many Sandforce-powered SSDs lack RAISE. I would think most of them do support it? In most cases, I can see it is disabled on the 60/64GB or 120/128GB version while being enabled on the higher capacity models. There is a lot of junk on the market, but out of all the popular models...
  15. S

    TRIM in RAID-0 on ICH9R? Any hope?

    Sounds plausible, since the Option ROM modification is probably to trick the drivers into believing it may utilise TRIM. Very curious if it actually works on your old ICH9. Somehow I think that the new (hacked) Option ROM might not work on ICH9 at all.
  16. S

    ZFS / RAIDz question

    That advice is not entirely incorrect. The 'no more than 9 devices in a vdev' advice is outdated and should be nuanced. The problem is that 30 devices in a RAID-Z3 vdev will still have the random I/O performance of a single drive. IOps scale with the number of vdevs, load balanced. In fact, 10...
  17. S

    TRIM in RAID-0 on ICH9R? Any hope?

    Intel as well since the 320 series (and of course newer S3500/S3700 series). However, Intel uses a dedicated NAND die for parity, so it behaves more like a RAID4 as opposed to distributed parity in RAID5. This doesn't change much however, the working is similar. Samsung appears to be an...
  18. S

    TRIM in RAID-0 on ICH9R? Any hope?

    Absolutely. It is a software issue not a hardware issue. You can pass TRIM through an old SATA/150 just fine, even PATA would not be a problem if the controller just passes commands it receives. In other words, there doesn't need to be any hardware support. It does require proper support from...
  19. S

    Plextor SSD and CrystalDisk readings

    Power On Hours does not mean how long the drive gets power. It does mean, however, how long the drive has been operating. Usually this is the same as the period the drive got power, but power savings can change all that. For a SSD, spending 24 hours in DIPM power management state, will mean it...
  20. S

    TRIM in RAID-0 on ICH9R? Any hope?

    Why not? ;-) 'Need' is relative, but you would want TRIM support. Without it, both write amplification and performance get worse over time. Garbage collection is no replacement for TRIM; only overprovisioning can be a replacement for TRIM. Usually consumer drivers have very little...
  21. S

    The effects of using improperly aligned disks with XP?

    You don't really need to align at same boundary as the stripesize. Especially if you have really large stripesizes (which I also use). So aligning to 1MiB on a 16MiB stripesize is okay. Good RAID0-engines will do partial I/O on stripe blocks; only the bad windows crap uses the stripesize as the...
  22. S

    The effects of using improperly aligned disks with XP?

    Please do note however that current generation SSDs often have 8K page size, and 128KiB erase block size or above. Aligning to 1MiB offset is really the best thing to do IMO. Partition alignment and filesystem frag size is something different, though related.
  23. S

    The effects of using improperly aligned disks with XP?

    AS SSD will tell you straight away if your alignment is good. It says either BAD or OK in the top left corner. Try it. There is no reason to misalign; even for 512-byte sector harddrives, the operating system should align properly. At least to 4KiB boundaries, but preferably to 1MiB boundaries...
  24. S

    How much does SSD performance scale with size?

    This has to do with both interleaving (most SSD controllers use 8 channel with 2 die per channel interleaving; 16-way interleaving in total) and with SATA bottlenecks. Interleaving is probably best described as RAID0; a single SSD is actually a RAID0 of several flash components. The one thing it...
  25. S

    The effects of using improperly aligned disks with XP?

    Pretty much everything requires alignment. Striping RAIDs, Modern 4K advanced format harddrives and virtually all SSDs. Pretty much everything, except older harddrives (<1TB in size). Misalignment hurts random I/O performance, causes much more wear on the drive (Write amplification) and is just...
  26. S

    Keeping Non-Trim Enabled RAID-0 Array in Good Health

    No, your SSD is much smarter than that. What you say applies to most USB sticks and other 'multimedia' flash memory, though. Solid State Drives utilise both wear levelling and write remapping. Wear levelling is what your USB sticks also support, and will indeed swap blocks to prevent a large...
  27. S

    Keeping Non-Trim Enabled RAID-0 Array in Good Health

    Use overprovisioning. Garbage collection alone isn't what you want to use, or your Write Amplification will rise and useful lifetime will drop. Overprovisioning is simple: just do not partition a part of the capacity of the SSD. Like a 120GB SSD having a 100GB partition means the 20GB is used...
  28. S

    SSD and Battery Life

    Depending on your laptop the gain could be about 10%. Many reviewsites test SSD power consumption without power saving technologies enabled. Typical power consumption of an SSD without power saving technology is 0,7 watts, while it drops below 0,1 watts with DIPM-power savings enabled. Assuming...
  29. S

    Good SSDs for systems without TRIM?

    Samsung SSDs generally are favorable for systems without TRIM, due to their agressive garbage collection, if you care about performance. If you care about write endurance, the Intel drives or Crucial M4 are best, due to their passive garbage collection. However, without overprovisioning those...
  30. S

    Western Digital Mainstream Internal Hard Drive = Green

    Green harddrives actually DOES mean 5400rpm or 5400rpm class. WD Green is one brand of green harddrive, but WD Green is not the same as green harddrives. Just like Mercedes is a type of car but not all cars are of the Mercedes brand. Intellipower is a marketing gimmick to hide the fact that...
  31. S

    Quick way to find bad memory?

    Disable memory bank interleaving in the BIOS to identify the memory stick which is giving you trouble. With memory bank interleaving enabled, all memory modules are 'interleaved' like RAID0. Thus, between 8 and 9GB you will have accessed all memory modules. Without memory bank interleaving...
  32. S

    Selling/Donating old machine with SSD...Erase?

    There is a difference between wiping the FTL and actually erasing the NAND. In the article you linked to, you can see HDtune screenshots where TRIMing or secure erasing would lead to different benchmark scores. The only reason for this is because if you read data from an SSD which the SSD...
  33. S

    RAID Controllers (including Intel RST/Matrix RAID)

    Intel onboard RAID, like all onboard/chipset RAID aka FakeRAID, is not hardware RAID. All RAID functionality is provided by Windows-only drivers. This is not bad however, since software RAID is superior to hardware RAID in many respects. I cannot find a reason in your post that explains why you...
  34. S

    Looking for photography storage solution

    I suggest you read up on ZFS and determine for yourself whether this is the right solution for you. The advantage of ZFS is that you can have cheap mass storage with cheap harddrives and still maintain a very high level of protection to your data. In particular, failures on the RAID level are...
  35. S

    What's the most reliable 512GB SSD for ~$300?

    Encoding a movie shouldn't be very I/O intensive. Even it it was, processing the movie ought to produce a sequential workload which harddrives are very good at. SSDs are only a factor 2 to 3 faster in this regard. More than likely this 'guy' is comparing an older system with HDD to a newer...
  36. S

    Selling/Donating old machine with SSD...Erase?

    Secure Erase and TRIM do not erase the NAND. Otherwise how could it take only 2 seconds? What Secure Erase does is reset the FTL or mapping table, which keeps track where data was stored. Basically it is a conversation table between logical LBA (what the host thinks how data was stored) and...
  37. S

    What is the optimum size for an SSD cache?

    That is for server workloads. Regular customers store much more static data with large files, instead of databases and other data that has much highly share of random I/O. For consumers, it is more like 0,01% to 1,5%. For example, just caching the metadata, which is a fraction of a multi...
  38. S

    Intel X-25M SSD, lags/stutters

    What exactly is the 'issue' here? The fluctuating graphs in HDtune are normal. In fact, you can see in the HDtune graph where real data is stored and which spots are free. The performance will be slower for parts that are in use, while unused sectors will have lower latency and higher...
  39. S

    WD HD fails, then replacement drive fails

    So funny people make judgements on a small set of statistically irrelevant experiences. Most people also are very generic about their idea of a 'failure'. They do not specify whether it was a mechanical failure or something like a bad sector or even bad cabling. In most cases they simply do not...
  40. S

    Crystal Disk Info vs WD disk utility conflict

    Without knowing what either CrystalDiskInfo or your WD utility have stated exactly, I cannot provide you with any feedback about your potential issue. You will need to provide us with the data that allows for such analysis.
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