at bottom :- On 30/12/2019, Alexander V. Makartsev <avbe...@gmail.com> wrote: > On 29.12.2019 15:49, shirish शिरीष wrote: >> Hi all, >> >> I read Alexander's reply with interest at [1] . >> >> @Alexander, thank you for taking time to answer my question/s . Maybe >> you can CC me the next time :) >> >> What was also interesting in your answer was the use of dark marketing >> practises used by some manufacturers to disguise TLC (3-bit NAND) >> memory chips as MLC ones but haven't shared either literature or any >> tools to tell them apart. >> > Worst offender of this trickery is Samsung. You have to carefully read > through full specifications for each device that available on official > web sites, which are often hidden behind very long page scrolls and many > clicks. > Basically, if it says "4-bit" it means drive was build with QLC NAND > type. And if it says "3-bit" it means TLC NAND type. And if it says > "2-bit" it means MLC NAND type. > And if some information is not available on official web site of some > manufacturer, personally I'd search for another SSD elsewhere. > There are also utilities that can view exact specifications of SSD, but > I don't know if similar programs exist for Linux. [1] > These kinds of utilities rely on internal database of known devices > (nand chips, controllers, SSDs), so they can't simply identify any and > all SSDs as is. > If you have identified exact NAND chip and its manufacturer you can look > up specifications for chips alone to see their, for an example, write > endurance, which varies and could be different for each NAND type. [2] > >> You shared something called TBW or DWPD ratings for SSD but again >> didn't share anything about that. Any links or literature which will >> help me find a bit more about them and perhaps what you have used it >> for ? My workload varies, sometimes it is compiling, sometimes it is >> running some tests, sometimes doing gaming and sometimes just browsing >> and using multimedia (movies etc.) . So my idea and stress would be >> general system improvements and response times. Also my budget is not >> that great, at the most I could afford is either a 500 GB to 1 TB > There is a good article to read about this. [3] >> >> I have also been reading about multi-actuator heads [2] in traditional >> HDD's but guessing they will be probably be priced and used by >> enterprise more rather than the enthusiast class at least in the >> beginning. I also have read blackbaze hdd failures to get some ideas >> about what's good or not even though their use-case scenario is far >> bigger than mine.[3] >> >> For e.g. for me the question would be how to deal with backups and >> crashes if a time comes, as checking 4 TB hdd's is also insane, at >> least in my puny setup. >> >> Looking forward to know more. >> >> 1. https://lists.debian.org/debian-user/2019/12/msg00726.html >> 2. >> https://blog.seagate.com/craftsman-ship/multi-actuator-technology-a-new-performance-breakthrough/ >> 3. https://www.backblaze.com/blog/hard-drive-reliability-stats-q1-2016/ >> > Personally, I use self-hosted NAS with RAID1 build from 2x 4TB NAS grade > HDDs. Because I like to keep my data private and I like the idea of > giving up storage space of one HDD drive as insurance for data safety. > From my personal experience over many years, I can see how HDDs could > fail in many different ways, long before SMART will mark them as "Failed". > But it is very unlikely (and unfortunate) to buy a brand new HDD that > will fail during it's warranty period, and if it worked fine before > chances are high it will continue to work for many years after warranty > period expires. > Fun fact: I still have my ~20 years old 3.5" Fujitsu 20GB IDE HDD that > is still alive and kicking. :) > > [1] http://aezay.dk/aezay/ssdz/ > [2] https://en.wikipedia.org/wiki/Flash_memory#Write_endurance > [3] > https://techcommunity.microsoft.com/t5/Storage-at-Microsoft/Understanding-SSD-endurance-drive-writes-per-day-DWPD-terabytes/ba-p/426024 > > -- > With kindest regards, Alexander. > > ⢀⣴⠾⠻⢶⣦⠀ > ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system > ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org > ⠈⠳⣄⠀⠀⠀⠀ >
Hi all, I was looking at debian-user December thread and missed Alexander's further reply at [1] The ssd-z utility [2] he shared seems interesting. Sadly, I would missed it as I'm not subscribed to the list. It took me sometime but remembered usb-modeswitch [3] and usb-modeswitch-data [3] which basically did and does something similar for usb modems. IIRC, the data package has details on low-level hardware stuff (IRQ addresses and such) so that the user can just fill in the details and just run it. The usb-modeswitch package was cool as I was able to query the device and share the details of my hardware with the maintainer in 2009 ish. I remember as did use MTS Blaze and do have a Reliance Jio dongle which behaves similarly as well (although don't use it as much nowadays.) This is strictly to be used while travelling. 1. https://lists.debian.org/debian-user/2019/12/msg00767.html 2. http://aezay.dk/aezay/ssdz/ 3. https://tracker.debian.org/pkg/usb-modeswitch 4. https://tracker.debian.org/pkg/usb-modeswitch-data -- Regards, Shirish Agarwal शिरीष अग्रवाल My quotes in this email licensed under CC 3.0 http://creativecommons.org/licenses/by-nc/3.0/ http://flossexperiences.wordpress.com E493 D466 6D67 59F5 1FD0 930F 870E 9A5B 5869 609C
