Date: Tue, 1 Mar 2016 08:41:20 -0600 From: Eric van Gyzen <vangyzen@FreeBSD.org> To: Michael Butler <imb@protected-networks.net>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: continuous stream of writes? Message-ID: <56D5AA10.5090703@FreeBSD.org> In-Reply-To: <56D5A59E.8040608@protected-networks.net> References: <56D5A59E.8040608@protected-networks.net>
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On 03/01/2016 08:22, Michael Butler wrote:
> On an otherwise idle machine, I now see a continuous stream of writes to
> disk. I've only noted this over the last couple of weeks but this will
> not be welcome behaviour on an SSD ..
>
> How do I find the source of these writes?
>
>
> imb@toshi:/home/imb> iostat 10
> tty ada0 cd0 pass0 cpu
> tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
> 0 992 58.53 229 13.10 0.00 0 0.00 0.37 0 0.00 13 2 7 1 78
> 0 23 30.82 12 0.36 0.00 0 0.00 0.00 0 0.00 2 0 4 0 94
> 0 8 31.38 12 0.37 0.00 0 0.00 0.00 0 0.00 0 0 4 0 96
> 0 8 31.75 11 0.34 0.00 0 0.00 0.00 0 0.00 3 0 3 0 94
> 0 8 31.82 11 0.35 0.00 0 0.00 0.00 0 0.00 1 0 3 0 96
> 0 8 31.76 12 0.36 0.00 0 0.00 0.00 0 0.00 0 0 3 0 96
> 0 8 31.75 11 0.35 0.00 0 0.00 0.00 0 0.00 1 0 4 0 95
> 0 8 31.55 12 0.38 0.00 0 0.00 0.00 0 0.00 1 0 3 0 96
>
The I/O mode of "top" might be useful:
top -m io
Eric
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