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Date:      Fri, 3 Feb 2023 06:40:07 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        jbo@insane.engineer, "hackers@freebsd.org" <hackers@freebsd.org>
Subject:   Re: Swap, ZFS & ARC
Message-ID:  <5149591a-1bd8-c3e8-eaea-fc08808f1b0f@grosbein.net>
In-Reply-To: <c70BKF1xrExMKWQeTJtDhOqJVqISFp9RjHFwT0XWDh3sTXyi0NMRkVhOyp_YkTXXAV7Dtm4tK4_XsOwSXuZRT39ObYtFpPoe6biv22jMNnM=@insane.engineer>
References:  <ysSGWaXF7vCDubzgFdov_9k6SMLNdZ3-zHV-2LOraYOxV_8yoAkDVPqDSicYsgBw1KdL6BjP4FkK1KFs7NKZ4RRXcSDxVe_Qy_i7b_5AbSI=@insane.engineer> <1689ba8c-a317-ce1f-2854-99566468a9ed@grosbein.net> <c70BKF1xrExMKWQeTJtDhOqJVqISFp9RjHFwT0XWDh3sTXyi0NMRkVhOyp_YkTXXAV7Dtm4tK4_XsOwSXuZRT39ObYtFpPoe6biv22jMNnM=@insane.engineer>

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02.02.2023 22:45, jbo@insane.engineer wrote:

>> 02.02.2023 21:28, jbo@insane.engineer wrote:
>>
>>> Hello folks,
>>>
>>> Based on a discussion on the forums not so long ago I tried to figure out how swap usage on a ZFS system plays together with ARC. However, I could find very little to no information on this which leads me to believe that there is some "core concept" I might be oblivious to.
>>>
>>> The main question is basically this: Your system starts to swap out data from RAM to your swap partition.
>>> This swap data on disk ultimately resides somewhere in a ZFS pool.
>>
>>
>> I prefer not doing this. That is, all my systems have swap partition outside of ZFS pool.
> 
> This isn't really achievable on your average "single disk" desktop systems, right?

For desktop systems you must use GPT/MBR to boot off single disk
and with partitioning there is no problem in creating dedicated slice for swap.




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