Date: Fri, 8 Dec 2017 17:45:56 -0500 From: Mike Tancsa <mike@sentex.net> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: zfs mirror and unequal writes Message-ID: <6f2e4f4b-a320-7317-875b-d0e7df64a5b3@sentex.net> In-Reply-To: <CA%2BtpaK30gjtsSb53UDnPDNDh6wGv86hNMrOqticqMMGmjB0BdQ@mail.gmail.com> References: <d9f8be97-7a6b-13fd-eb33-9d37c5dc7c43@sentex.net> <CA%2BtpaK30gjtsSb53UDnPDNDh6wGv86hNMrOqticqMMGmjB0BdQ@mail.gmail.com>
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On 12/8/2017 5:40 PM, Adam Vande More wrote:
>
> 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.
Actually, thats the odd thing, swap is on ada0 (only) and its the one
with dramatically less writes. I looked a few recently deployed SSD
boxes and they are all very close as well. This is the one outlier. Not
sure if its indicative of some other pathology of the drive ?
0{backup4}# grep swap /etc/fstab
/dev/ada0p2 none swap sw 0 0
#/dev/ada1p2 none swap sw 0 0
0{backup4}# ls -l /etc/fstab
-rw-r--r-- 1 root wheel uarch 111 Oct 24 2014 /etc/fstab
0{backup4}#
1{backup4}# gpart show ada0
=> 34 250069613 ada0 GPT (119G)
34 6 - free - (3.0K)
40 1024 1 freebsd-boot (512K)
1064 41943040 2 freebsd-swap (20G)
41944104 208125536 3 freebsd-zfs (99G)
250069640 7 - free - (3.5K)
0{backup4}# gpart show ada1
=> 34 250069613 ada1 GPT (119G)
34 6 - free - (3.0K)
40 1024 1 freebsd-boot (512K)
1064 41943040 2 freebsd-zfs (20G)
41944104 208125536 3 freebsd-zfs (99G)
250069640 7 - free - (3.5K)
0{backup4}#
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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