Date: Thu, 26 Nov 2020 01:14:02 -0700 From: Warner Losh <imp@bsdimp.com> To: Gary Jennejohn <gljennjohn@gmail.com> Cc: tech-lists <tech-lists@zyxst.net>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: possible usb3-connected hard drive spin down causing lag Message-ID: <CANCZdfr1wbUY_KxyCca8DDR4b6RVpmp6gN-e3ExKcdHSzJFFbQ@mail.gmail.com> In-Reply-To: <20201126080724.1cb3a8af@ernst.home> References: <X77ygGTS09S91bTC@rpi4.local> <20201126080724.1cb3a8af@ernst.home>
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On Thu, Nov 26, 2020 at 1:07 AM Gary Jennejohn <gljennjohn@gmail.com> wrote: > On Thu, 26 Nov 2020 00:10:40 +0000 > tech-lists <tech-lists@zyxst.net> wrote: > > > Hi, > > > > I have a usb3-connected harddrive. dmesg shows this: > > [...] > > da0: <ADATA HD710 0> Fixed Direct Access SPC-4 SCSI device > > [...] > > > > running current-r367806-arm64 > > > > I think it might be auto-spinning-down or auto-sleeping. It's > > making initial interaction lag of 2-3 seconds. Is there a sysctl or > > something somewhere where I can tell it to never sleep? Or is that > > something I'd need to contact the manufacturer about? Or is there > > an alternative strategy like tmpfs. It's not a "green" drive but I > > guess it might be "green" in that it's usb3 powered. > > > > I have vfs.read_max=128 in /etc/sysctl.conf > > zdb has ashift=12 > > > > In case it's relevant, the filesystem on the disk is zfs. Once > > "woken up", inferaction is quick, as expected. > > thanks, > > > > I'd be interested in an answer to this question myself. I have > several USB-attached UFS2 disks which spin down after a few minutes. > > But, based on some quick searches, this behavior is either a "feature" > of the disk itself - seems common with so-called green disks - or of > the controller in the external enclosure or docking station. > > This behavior makes sense for drives used with laptops, but for > desktop computers not so useful. > > There are some sysctl's relevant to spindown, but they appear to only > come into play during suspend or shutdown. The ones relevant to USB > which I found are: > > kern.cam.ada.spindown_suspend: Spin down upon suspend > kern.cam.ada.spindown_shutdown: Spin down upon shutdown > > There may be commands which a user can send the disk/controller to > disable this behavior, but I didn't find any with my simple searches. > For SAS drives, there's a mode page that controls this behavior. You might see if the sysutil/ataidle port/package does what you want. Warner
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