Date: Mon, 10 Apr 2017 12:55:37 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-doc@FreeBSD.org Subject: [Bug 218538] tuning(7) should either be removed or strictly maintained. Message-ID: <bug-218538-9@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218538 Bug ID: 218538 Summary: tuning(7) should either be removed or strictly maintained. Product: Documentation Version: Latest Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: Documentation Assignee: freebsd-doc@FreeBSD.org Reporter: jason@aventia.pw man tuning comes with the OS, it contains information that may be out of da= te, and generally not a good idea to provide advice which can be reversed or negated with incremental updates. There are plenty of tuning guides not included with the OS, but when one is included with the OS it must be up to date. Example the following excerpt seems to come from the 4.x days, certainly it= is not include or allude to the suggestions to improve performance under ZFS: <exceprt man tuning FreeBSD 11.0-RELEASE-p8 May 9, 2016> STRIPING DISKS In larger systems you can stripe partitions from several drives togeth= er to create a much larger overall partition. Striping can also improve = the performance of a file system by splitting I/O operations across two or more disks. The gstripe(8), gvinum(8), and ccdconfig(8) utilities may= be used to create simple striped file systems. Generally speaking, strip= ing smaller partitions such as the root and /var/tmp, or essentially read- only partitions such as /usr is a complete waste of time. You should only stripe partitions that require serious I/O performance, typically /var, /home, or custom partitions used to hold databases and web pages. Choosing the proper stripe size is also important. File systems tend = to store meta-data on power-of-2 boundaries and you usually want to reduce seeking rather than increase seeking. This means you want to use a la= rge off-center stripe size such as 1152 sectors so sequential I/O does not seek both disks and so meta-data is distributed across both disks rath= er than concentrated on a single disk. If you really need to get sophisticated, we recommend using a real hardware RAID controller from the list of FreeBSD supported controllers. --=20 You are receiving this mail because: You are the assignee for the bug.=
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