On 30.12.2019 20:18, Gene Heskett wrote: > On Monday 30 December 2019 05:16:51 Alexander V. Makartsev wrote: > >> On 29.12.2019 16:56, Gene Heskett wrote: >>> On Sunday 29 December 2019 04:42:20 Alexander V. Makartsev wrote: >>>> On 29.12.2019 12:37, shirish शिरीष wrote: >>>>> Dear all, >>>>> >>>>> Last year I had read some articles when I was looking to build a >>>>> system there seemed to problems with hybrid drives. Does anybody >>>>> know how things stand/look today and if anybody had any good/bad >>>>> experience with them ? IIRC, the issues were more to do with the >>>>> firmware rather than the hardware, is it the same or have things >>>>> improved ? which package I should be looking at if I'm looking for >>>>> solutions ? >>>>> >>>>> >>>>> I am ok with using either a stable or an alpha/debian-installer >>>>> snapshot if people have had good experience. >>>>> >>>>> Just so people have an idea about what hybrid drives are all >>>>> about, here are couple of links >>>>> >>>>> https://www.seagate.com/in/en/do-more/how-to-choose-between-hdd-st >>>>> or age-for-your-laptop-master-dm/ >>>>> >>>>> https://www.howtogeek.com/195262/hybrid-hard-drives-explained-why- >>>>> yo u-might-want-one-instead-of-an-ssd/ >>>> I strongly suggest against hybrid drives. It's just added >>>> complexity and therefore more ways and parts to fail with time. >>>> If you considering to buy hybrid HDD, chances are high you simply >>>> want faster performance for your system. I don't see why to choose >>>> slightly better solution (hybrid) over fastest one (SSDs). >>>> For a system disk and\or laptop upgrade, I'd stick with plain >>>> MLC-based (2 bit) NAND 250GB+ SSD (or NVMe if your system allows >>>> it), because they have the best reliability+performance+price >>>> ratings. Try to avoid TLC-based SSDs because they have much lower >>>> reliability and performance in comparison to MLC-based SSDs, but >>>> also much cheaper. And completely avoid QLC-based SSDs, which are >>>> cheap, but slow and unreliable, similar to USB flash drives. >>>> Backup your data (obvious), monitor health of your SSDs using >>>> S.M.A.R.T. and you'll be just fine. >>>> Also, watch out for manufacturers who use dark marketing practices, >>>> offering MLC-based (3-bit) NAND in advertisement, which is >>>> non-sense, but in reality they should be called TLC-based (3-bit) >>>> NAND, and also avoid manufacturers who is hiding real TBW or DWPD >>>> ratings of their SSD products and offer only useless MTBF rating. >>>> By using TBW or DWPD ratings you can calculate how long SSD will >>>> last in your estimated work-load. >>> So how does one tell what sort of a drive I've bought half a dozen >>> of for under a 50 dollar bill for a 240 gig with a sata interface >>> actually is? ADATA's on sale usually. >>> >>> I've so far used them for a couple years, either on a std sata >>> cable, as the only drive in a cnc machine or on a usb-3 to sata >>> adapter. I've had zero drive failures and one adapter cable failure, >>> with the 2 latest installed as swap and work drives for compiling >>> both kernels and makeing deb's of linuxcnc on an rpi4. Cuts a kernel >>> build time by several hours, but I have noted they do get a lot >>> slower if the file being copied is several gigabytes. Giving an 2Gb >>> rpi4 a 10 Gb swap to play in is plumb amazing. Using 197 megs to >>> build the rs-274 interpreter of linuxcnc there was no slowdown while >>> doing it. >>> >>> There may be better choices out there, and I'd like to be able to >>> tell the difference, but these so far have been more that good >>> enough for "the girls I go with". >>> >>> Cheers, Gene Heskett >> You have to read through specifications that are available on official >> web site of the manufacturer. >> In addition to what I described in my previous email for OP, ADATA is >> also takes an opportunity to trick their customers, for an example >> they sell "Ultimate SU650" model which, according to their web site >> filter [1] could be either TLC or MLC type, and you still can't tell >> exact NAND type by reading specifications table [2] or the sticker on >> the device itself. >> Obviously, there is no way to see if manufacturers are lying about >> their specifications before you actually buy the specific model of >> SSD. And after you bought it, you can check the internals of it with >> SSD-Z utility. [3] >> I don't know if similar utility exists for Linux, though. >> >> [1] https://www.adata.com/en/Solid-State-Drives/25/ >> [2] https://www.adata.com/en/specification/503 >> [3] http://aezay.dk/aezay/ssdz/ > Thank you Alexander, interesting links, particularly the last one. I've > not even tried to snoop thru these as so far they Just Work. > > Is smartctl growing any knowledge of these yet? I've not been aware of > any updates to it in a year or so. I don't think so. This information is quite the low-level stuff, far beyond simple S.M.A.R.T. manipulations, so I'd expect such functionality more from projects like "lshw", "hdparm" or similar. > What os does this SSDZ work on? It is relatively new at this moment and supports Windows only. I don't know if author has Linux support in mind for future releases.
-- With kindest regards, Alexander. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄⠀⠀⠀⠀
