Running FreeBSD on M.2 SSD
Karl Denninger
karl at denninger.net
Tue Feb 25 15:11:27 UTC 2020
On 2/25/2020 9:53 AM, John Kennedy wrote:
> On Tue, Feb 25, 2020 at 11:07:48AM +0000, Pete French wrote:
>> I have often wondered if ZFS is more aggressive with discs, because until
>> very recently any solid state drive I have used ZFS on broke very quicky. ...
> I've always wondered if ZFS (and other snapshotting file systems) would help
> kill SSD disks by locking up blocks longer than other filesystems might. For
> example, I've got snapshot-backups going back, say, a year then those blocks
> that haven't changed aren't going back into the pool to be rewritten (and
> perhaps favored because of low write-cycle count). As the disk fills up, the
> blocks that aren't locked up get reused more and more, leading to extra wear
> on them. Eventually one of those will get to the point of erroring out.
>
> Personally, I just size generously but that isn't always an option for
> everybody.
I have a ZFS RaidZ2 on SSDs that has been running for several /years
/without any problems. The drives are Intel 730s, which Intel CLAIMS
don't have power-loss protection but in fact appear to; not only do they
have caps in them but in addition they pass a "pull the cord out of the
wall and then check to see if the data is corrupted on restart" test on
a repeated basis, which I did several times before trusting them.
BTW essentially all non-data-center SSDs fail that test and some fail it
spectacularly (destroying the OS due to some of the in-flight data being
comingled on an allocated block with something important; if the
read/erase/write cycle interrupts you're cooked as the "other" data that
was not being modified gets destroyed too!) -- the Intels are one of the
very, very few that have passed it.
--
-- Karl Denninger
/The Market-Ticker/
S/MIME Email accepted and preferred
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4897 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20200225/e0196b3b/attachment.bin>
More information about the freebsd-stable
mailing list