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