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Date:      Thu, 15 Oct 2020 08:06:15 +0200
From:      Jacques Foucry <jacques+freebsd@foucry.net>
To:        Ralf Mardorf <ralf-mardorf@riseup.net>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: A couple of questions about SSDs
Message-ID:  <20201015060615.GJ22063@mithril>
In-Reply-To: <20201014202206.7c7886d0@archlinux>
References:  <fee9e64d-4b27-d1cf-11c5-5af9ffa99935@netfence.it> <20201014121442.662e71c4@archlinux> <20201014174749.6df7572a.freebsd@edvax.de> <20201014202206.7c7886d0@archlinux>

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Le mercredi 14 oct. 2020 à 20:22:06 (+0200), Ralf Mardorf à écrit:
> On Wed, 14 Oct 2020 17:47:49 +0200, Polytropon wrote:
> >My guess (and it's really just a guess due to my personal lack
> >of any important data and experience) is that the SSD will work
> >until it is replaced by a bigger one, or the whole system it is
> >installed in will be replaced with a faster one. So there is
> >nothing to worry about. If you _really_ want to worry about
> >something, ask the manufacturer if they made the firmware brick
> >the whole thing when a certain write count is reached so you
> >cannot even _read_ your data anymore. :-)
> 
> In my desktop PC are 5 SSDs. Four are connected to the mobos SATA 3
> connectors and one is connected to a SATA 2 connector. Four are 223.57
> GiB sized and one is 447.13 GiB sized. I'm to lazy to check how old
> each of them is, but IIRC the oldest is around 3½ years old and the
> vendor's software mentions that the "health" is at 64%, the system
> drive is one of the newer SSDs, maybe around 2 years old, "health" 57%.
> 
> In my experiences HDDs last for around 2 years, if you turn the computer
> on and off very often and for around 7 years, if the computer runs more
> or less 24/7. It depends on several factors ;). I don't know for how
> long external backup and archive HDDs do last. Probably for way longer
> than 7 years.
> 
> However, my guess is, due to a lack of experiences with SSDs, that they
> last for as long as HDDs do last. However, I suspect I will replace one
> by another with more sized SSDs already before they fail.
> 
> I became a digital photographer a few weeks ago and noticed, that I
> was mistaken a while ago, when we talked about storage space. Nowadays I
> tend to make one or two photos more, than I've done, when I needed to
> pay for 35 mm film ;).
> 
> Due to a lack of money, I put together two new 2 external 2 TB HDDs
> with USB enclosures, to reorganize my current internal SSDs and my
> current external backup and archive HDDs. Btw. I've done this today.
> 
> As soon as I've got enough money again, I will get also more external
> storage space. Maybe I'll continue using USB (/eSATA) enclosures, maybe
> I'll get a swap bay. I've got no experiences with NAS. It seems to be
> too expensive. However, a starting point would be to replace my 1 and 2
> TB external HDDs with 4 TB HDDs. The used enclosures are suitable for
> HDDs up to 4 TB.
> 
> >As long as the light switch doesn't suddenly shout "I've been
> >used 1500 times now, I'm kaputt, please buy a new one!" everything
> >should be okay within the limits of reality.
> 
> If my SSDs should do this after 4 or 7 years, I could accept it. Btw.
> my iPad 2 is way older than 3 years and the internal 32 TB
> drive was used to it's limits, but still works. My new iPad has a build
> in 1 TB drive for good reasons.
> 
> >For the case of using lots of "throwaway files" (i. e. stuff you
> >only need as files during ports builds), you can always use a
> >RAM disk, if your system has enough RAM. And swap space that you
> >don't write to doesn't add any wear.
> 
> FreeBSD might work better, maybe the Linux of other users does, too. If
> I exceed tmpfs size with my Linux, when building packages, swap isn't
> used. Build aborts with a "no space left on device" error.
> 
> >> What exactly makes you think, that SSDs need gentle treatment?  
> >
> >It's probably the limit on write cycles, but I'm not sure how
> >this compares to general lifetime calculations compared to
> >regular hard disks...
> 
> Neither do I, but it seems likely that they last as long, as HDDs do.
> Most file systems are ext4 (on the old HDDs it probably was ext3),
> journaling enabled, some use relatime, some use noatime. The noatime
> option isn't used to reduce write cycles of a SSD, it's a leftover from
> the times when my computers used HDDs for audio production and should
> help to achieve better performance.
> 
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I use a SSD on my latptop (1TB) わith 8GB of swap, 256K used.

For my Backup and other services I use a HP Proliant Micre server Gen10 with
FreeNAS and a jail with nextcloud. It work like a charm!

My NAS run with 4 disks, 2 of 3TB in mirror and 2 of 8TB in mirror two. The
freenas-boot zpool is on a USB key mirrored (64G each with is to big).

Just for information.

Have a nice day!
-- 
Jacques Foucry



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