>> AFAIK their performance for RAID is no worse than for non-RAID uses.
>> There might be specific RAID uses where they suck more (apparently RAID
>> as done by ZFS is among them), but according to the above tests it's not
>> much worse at RAID than at other things.
> Issues I have personally seen
>> That was not the experience reported in the link I sent. And I'd expect
>> a RAID rebuild/scrub should result in large sequential operations, which
>> should not trigger the usual SMR weakness. Maybe it depend on specifics
>> of how the rebuild/scrub proceeds?
> We might be wandering rather of
On 9/24/25 10:38, Nicolas George wrote:
Andy Smith (HE12025-09-24):
It's not normally hard in 2025 to tell from specs what is and isn't an
SMR drive though.
A pointer would be appreciated.
Seagate UK publishes a list of CMR vs. SMR, etc., drives:
https://www.seagate.com/gb/en/products/cmr-
>> > If I will use the kernel of Debian Trixie or more recent, do I still
>> > need to worry about SMR drives, or will they just work?
>>
>> They should just work (see
>> https://www.reddit.com/r/DataHoarder/comments/14nz7ow/extensive_testing_smr_results_with_raid_rebuild/
>> for example), but be
Andy Smith (HE12025-09-24):
> It's not normally hard in 2025 to tell from specs what is and isn't an
> SMR drive though.
A pointer would be appreciated.
Thanks to everybody who provided accurate information here.
Regards,
--
Nicolas George
Hi,
On Wed, Sep 24, 2025 at 11:35:41AM -0400, Stefan Monnier wrote:
> > If I will use the kernel of Debian Trixie or more recent, do I still
> > need to worry about SMR drives, or will they just work?
>
> They should just work (see
> https://www.reddit.com/r/DataHoarder/comments/14nz7ow/extensive
On Wed, Sep 24, 2025 at 02:07:45PM +0100, alain williams wrote:
As for how you use them: if you do a lot of writing to the disk then do not use
SMR.
*non sequential* writing. If you have one thread writing big chunks at a
time there's no real difference between SMR and CMR.
On Wed, Sep 24, 2025 at 02:58:37PM +0200, didier gaumet wrote:
> I am not at all knowledgeable on theses subjects.
I found this explantion good:
https://www.howtogeek.com/803276/cmr-vs.-smr-hard-drives-whats-the-difference/
As for how you use them: if you do a lot of writing to the disk then do
Hello Nicolas,
I am not at all knowledgeable on theses subjects.
From a quick research, it seems that SMR technology is already
not-so-new, and can be found among others technologies on the market.
Some workarounds seem to still be developed (search SMR on github) and
Seagate indicates it i
ср, 24 сент. 2025 г. в 16:46, Nicolas George :
> I mean, if some hard drives are unusable with RAID, at some point the
> authors of the kernel will implement work-arounds to make them work
> anyway, and the manufacturers will tweak their firmwares to avoid
> cutting themselves from the server mark
On Wed, Sep 24, 2025 at 01:46:26PM +0200, Nicolas George wrote:
> Hi.
>
> I am in the market to buy a pair of non-identical ≥ 10 tera-octets hard
> drives to use as mdadm RAID1. There this info floating around that some
> large hard drives use a technology named “SMR” and are bad for RAID.
Find o
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