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Ip=[23.103.226.20]; Helo=[032-smtp-out.weatherford.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR03MB3270 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Jun 2017 22:14:17 -0000 I've been having a problem with FreeBSD ZFS SSD performance inexplicably d= egrading after < 24 hours uptime as described in a separate e-mail thread.= In an effort to get down to basics, I've now performed a ZFS-on-Root inst= all of FreeBSD 11.1 Beta 2 amd64 using the default Auto(ZFS) install using = the default 4k sector emulation (vfs.zfs.min_auto_ashift=3D12) setting (no = swap, not encrypted). Firstly, the vfs.zfs.min_auto_ashift=3D12 is set correctly in the /boot/loa= der.conf file, but doesn't appear to work because when I log in and do "sys= tctl -a | grep min_auto_ashift" it's set to 9 and not 12 as expected. I tr= ied setting it to vfs.zfs.min_auto_ashift=3D"12" in /boot/loader.conf but t= hat didn't make any difference so I finally just added it to /etc/sysctl.co= nf where it seems to work. So, something needs to be changed to make this = functionaly work correctly. Next, after reboot I was expecting somewhere in the neighborhood of 950MB/s= from the ZFS mirrored zpool of 2 Samsung 850 Pro 256GB SSDs that I'm using= as I was previously seeing this before with my previous FreeBSD 11-Stable = setup which, admittedly, is a different from the way the bsdinstall script = does it. However, I'm seeing half that on bootup. Performance result: Starting 'dd' test of large file...please wait 16000+0 records in 16000+0 records out 16777216000 bytes transferred in 37.407043 secs (448504207 bytes/sec) Zpool Status: pool: zroot state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ada0p2 ONLINE 0 0 0 ada1p2 ONLINE 0 0 0 /boot/loader.conf: kern.geom.label.disk_ident.enable=3D"0" kern.geom.label.gptid.enable=3D"0" vfs.zfs.min_auto_ashift=3D12 vfs.zfs.arc_min=3D"50M" vfs.zfs.arc_max=3D"51M" zfs_load=3D"YES" /etc/sysctl.conf: vfs.zfs.min_auto_ashift=3D12 Is this the expected behavior now in FreeBSD 11.1? -- Aaron This message may contain confidential and privileged information. If it has= been sent to you in error, please reply to advise the sender of the error = and then immediately delete it. If you are not the intended recipient, do n= ot read, copy, disclose or otherwise use this message. The sender disclaims= any liability for such unauthorized use. 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