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Tue, 8 Feb 2022 21:10:53 -0500 (EST) Date: Wed, 9 Feb 2022 02:10:50 +0000 From: tech-lists To: freebsd-questions@freebsd.org Subject: general zfs/zvol question Message-ID: Mail-Followup-To: freebsd-questions@freebsd.org List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="UKhNufMhCrntTKhH" Content-Disposition: inline X-Rspamd-Queue-Id: 4Jtjz92kGCz4STG X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=zyxst.net header.s=fm1 header.b=X36rWlgG; dkim=pass header.d=messagingengine.com header.s=fm2 header.b=gdU3Nnke; dmarc=none; spf=pass (mx1.freebsd.org: domain of tech-lists@zyxst.net designates 64.147.123.20 as permitted sender) smtp.mailfrom=tech-lists@zyxst.net X-Spamd-Result: default: False [-6.70 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[zyxst.net:s=fm1,messagingengine.com:s=fm2]; NEURAL_HAM_LONG(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:64.147.123.20]; MIME_GOOD(-0.20)[multipart/signed,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_LOW(-1.00)[messagingengine.com:dkim]; RCVD_COUNT_THREE(0.00)[4]; MID_RHS_MATCH_FROMTLD(0.00)[]; DKIM_TRACE(0.00)[zyxst.net:+,messagingengine.com:+]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_NA(0.00)[zyxst.net]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; MLMMJ_DEST(0.00)[freebsd-questions]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:29838, ipnet:64.147.123.0/24, country:US]; RCVD_IN_DNSWL_LOW(-0.10)[64.147.123.20:from] X-ThisMailContainsUnwantedMimeParts: N --UKhNufMhCrntTKhH Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello experts, What would you think would run faster, all else being equal: 1. a freebsd vm, the image being file-backed (i.e. the empty vm image=20 initially created with say "truncate -s 64g freebsdvm.img) on a freebsd=20 zfs filesystem on the host, and the installed filesystem on the guest=20 being UFS, or 2. a freebsd vm, the image being zfs-backed (ie a zvol) and the installed= =20 filesystem on the guest being UFS, or 3. the same as example 2, the guest filesystem being zfs? for context this is recent stable/13, so OpenZFS, and the guest vm would=20 have 4*vCPU and 16GB vRAM I *think* example #2 would be fastest, if the underlying zfs vol was also= =20 using zstd compression. But I'm only guessing, and it's not a qualified guess. I'm wondering if anyone has done this and what their impressions wer= e. thanks, --=20 J. --UKhNufMhCrntTKhH Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEE8n3tWhxW11Ccvv9/s8o7QhFzNAUFAmIDIp4ACgkQs8o7QhFz NAWABw/9HOzg6QvQ+foOFXqkeRw4qr0ZQDkCQT+ubTSiHG9NBOmDkL5GmsYn3odt 348UeppNyuaQiKo3cU95eY56zadXSqZLuoNT0LTBlQYFXc+dPMmY1ugVQPs++NFP fmsLsGRDCXGy1Aw692LOH5eHcOu6QIh4EoR7JNLW7KZG7Q1Ep7xk07jNfUroBpay tVuVRIVnedA547kX0+SFEA/SE8n/V00Wg5wh5N18sxo5p7fz/jS6iXFyUBrXb0DS PwEQgb47uc+h22p17ce0ac+9tqJBs4jCxXCTa7FuYGefQa99zqcTMOsnbMP/B1Ch QoVh1SuL2FevbWr2WGkxusuHENMd8DemSj5e9wfkB0TT9ENNRNFZwHOL4tTUeEMB BYoeruUcCDz03l0q9y2K+AFrCy+xLcxzQlLlPZ5IwtH7ioiyIbCDZRlI68ex61H6 Z7Ng09ODv/jeH80Vv8H09Tmquer74Oe/B29NmvjvZ0akH//iVreJjV5M6Zk4xzo3 5aMk3WQO3+cxm7dqnOA+dT/B1Hzn69hteOd/A1C2pyTKodfUROnL4WPvkzUqkIaF fOzEpFzol+3LzBXnehiPEFWxngAUppxCfacYdvmVmo4QVYV35Y8SVhTEFNgoPrjk 6dhtIh/tUxz5XzQATqCkXpFmrs31y49SxFrKCJGSyxppeeVB95M= =Zc7Y -----END PGP SIGNATURE----- --UKhNufMhCrntTKhH--