Re: considering a new system and a sshd hybrid drive
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.
What os does this SSDZ work on?
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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