Date: Thu, 19 Oct 2017 06:58:45 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: Md based tmpfs with zfs root system. Message-ID: <f38f69d4-09f2-caaf-582d-ee0aa59c07bd@FreeBSD.org> In-Reply-To: <20171018164559.GA3267@anza.vindaloo.com> References: <20171018164559.GA3267@anza.vindaloo.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --aH8ooV5C7cd51C48lug0OG9Ono4n9nHjs Content-Type: multipart/mixed; boundary="mSjvxnoFQIQeBVHqSCgKepWoLLSu9awIr"; protected-headers="v1" From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Message-ID: <f38f69d4-09f2-caaf-582d-ee0aa59c07bd@FreeBSD.org> Subject: Re: Md based tmpfs with zfs root system. References: <20171018164559.GA3267@anza.vindaloo.com> In-Reply-To: <20171018164559.GA3267@anza.vindaloo.com> --mSjvxnoFQIQeBVHqSCgKepWoLLSu9awIr Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: quoted-printable On 18/10/2017 17:45, Christopher Sean Hilton wrote: > Good day, >=20 > I've using a new system with root on zfs. I've traditionally used a > /dev/md* based tmpfs for /tmp. A little initial reading on the subject > shows an argument about this practice but I didn't find any threads > that provide a resolution. Furthermore, all the information that I > found which says that this is a bad idea dates from about FreeBSD-8.2, > and that's long obsolete. >=20 > What's the current resolution on this for a FreeBSD 11-STABLE user? > Should I avoid using a swap backed /dev/md based tmpfs filesystem for > /tmp? >=20 Using a tmpfs for /tmp is perfectly fine -- but you don't need to touch any /dev/md devices; just add a line like this to /etc/fstab: tmpfs /tmp tmpfs rw,mode=3D1777 0 0 I do this as standard on my machines, including in all jails. In fact, I think using a temporary swap backed filesystem for ephemeral data is an underused idea in FreeBSD: machines nowadays generally have much more swap configured than they will actually use, and that diskspace is otherwise wasted. Cheers, Matthew --mSjvxnoFQIQeBVHqSCgKepWoLLSu9awIr-- --aH8ooV5C7cd51C48lug0OG9Ono4n9nHjs Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQJ8BAEBCgBmBQJZ6D8bXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ2NTNBNjhCOTEzQTRFNkNGM0UxRTEzMjZC QjIzQUY1MThFMUE0MDEzAAoJELsjr1GOGkAT/RwP/15sjgJ8X0oCZ1Lcd/0dH7YL CuiyKNYiWQOm2ARMx7MQR08EgWI7VYNpjlM1Flfz/lSRmRt9j9t0D0VvOyNeBn6f 9/1Kz3J38yLP6umpxgWOu0wD+AdmPN8lJnlv1cIq+SnBNEFNnfNf5mDtLdh0mYGR kZM8f+ZNIM3Vg0dOFDrTfIkHnA99stljM0sI58Z7oOE8Yyi82XyD9nua62+PGkdS 42O5TpQR9TNY7RvxwMPoRXnNQCC7ClbBcLHCvwf8wmKtxELyO/zHzwLgUgVTgTwi xqSezqa2KFbBYI7B73CP9ekLRPZ6oJ/V7cS9zUQhSc6xNsOeKeUKE9xQg0aAU/Fd tvTCEw7LqB9fUi/g6++E1EmFevdxr//gG3RpS0Zpw9YDLzCh9NOUYUqj0pKLBN1e IPRp/MNkZGrKnCfNCTigfp7fu9w6ihTrFObHPofeYQxTTQGyf1x4GIdAN6qkcmWn s2NZ+JOPpgNe9RascXtBEZCsbz7EaEP/2gIhLAFHPIDGPFTSB/KrrYSqIQaajCqD XiuqUs6ankHJdWp2tL7+Qkt6r3QGZR3w3E4Jz22Qzd3crerw47DmB5P3suq1ogFz VgFv4bNVW70bya8lJ17g4tqMBET8R7yPO99K168SgKd+Jy5Dli8i6qLM90MGBgC7 Q9sEsve/6u7px2t0C3XR =wgLa -----END PGP SIGNATURE----- --aH8ooV5C7cd51C48lug0OG9Ono4n9nHjs--
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