Re: considering a new system and a sshd hybrid drive
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
⠈⠳⣄⠀⠀⠀⠀
Reply to: