Date: Fri, 8 Dec 2017 16:40:10 -0600 From: Adam Vande More <amvandemore@gmail.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: zfs mirror and unequal writes Message-ID: <CA%2BtpaK30gjtsSb53UDnPDNDh6wGv86hNMrOqticqMMGmjB0BdQ@mail.gmail.com> In-Reply-To: <d9f8be97-7a6b-13fd-eb33-9d37c5dc7c43@sentex.net> References: <d9f8be97-7a6b-13fd-eb33-9d37c5dc7c43@sentex.net>
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On Fri, Dec 8, 2017 at 3:57 PM, Mike Tancsa <mike@sentex.net> wrote:
> I was reading up on SSD life spans and decided to take a quick look at
> how many TBW my disks have gone through. Looking at one box I was really
> surprised at the uneven amount of data written
>
>
> 0{backup4}# smartctl -a /dev/ada0 | grep LBAs
> 241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always
> - 21004341355
> 0{backup4}# smartctl -a /dev/ada1 | grep LBAs
> 241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always
> - 413475182465
> 0{backup4}#
>
> I was quite surprised that there were WAY more writes to one disk that
> the other. Give these are zfs mirrors, one says 192TB writes and the
> other is 10TB ?!?!?!
>
> They were installed at the same time
>
Do you have the disks allocated in any other way eg swap or have a member
drop out for awhile?
I checked my mirror which has been in place for ~4 years and the values are
pretty close, although I have different drives which are mechanical.
--
Adam
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