Re: Long wait for start job

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, 2021-06-18 at 09:02 -0300, George N. White III wrote:
> On Fri, 18 Jun 2021 at 06:50, Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx>
> wrote:
> 
> > On Fri, 2021-06-18 at 08:58 +1000, Cameron Simpson wrote:
> > > On 17Jun2021 12:15, Patrick O'Callaghan <pocallaghan@xxxxxxxxx>
> > > wrote:
> > > > On Thu, 2021-06-17 at 07:20 -0300, George N. White III wrote:
> > > > > > The technical specifications of the drives should mention
> > > > > > startup
> > > > > power
> > > > > management.  There may also be some power management in the
> > > > > dock.
> > > > > I've noticed that it is becoming more difficult to find
> > > > > detailed
> > > > > documentation
> > > > > of add-on hardware.  At one time you could open the box,
> > > > > identify
> > > > > key
> > > > > IC's
> > > > > and get the spec. sheets, but now you may find a general-
> > > > > purpose
> > > > > CPU.
> > > > > 
> > > > 
> > > > It's a cheap dock so probably not easy to find any technical
> > > > documentation. One thing I might try is to swap the two drives
> > > > around
> > > > just to see if it's always the same one that causes the delay.
> > > 
> > > On the subject of power as raised by George, I had trouble with too
> > > many
> > > USB bus powered drives on the home server. A powered USB 3.1 hub
> > > helps
> > > me out there. Doubtless it has its own limits.
> > 
> > The dock has its own power supply.
> > 
> 
> Is this a full-featured dock with USB and monitor outlets or a
> disk only dock?
> 
> It might be useful to compare the rating of the power supply with
> the peak load from the drive spec sheet.   Older high RPM drives
> had quite high startup draw.   Does the power supply have multiple
> voltages or just one voltage (the latter requires conversion in the
> hub)?   If the power supply can't meet the startup requirements of
> two drives then it must be doing some power management.  The
> simplest approach would be to provide a delay before starting
> one of the drives.

Interesting idea. Mine is this model:

https://www.amazon.co.uk/gp/product/B06XYJGDTH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

The power block says its output is 3A at 12V.

The drives are both WD model WD10EZEX, (though the label on one says it
has a 64MB cache and the other doesn't). Both labels say 5VDC, 0.68A
and 12VDC, 0.55A. Looks like the dock's power should be enough.

> Amazon has a popular Sabrent disk-only dock -- one review notes:
> 
> Cons
> - when using 2 drives and plugging or unplugging one drive BOTH
> go offline, at least temporarily. NOTE: Seems to be a common limitation
> to all these docks. I have yet to find one that does not behave this
> way.
> Must be the way the SATA bus controller is designed.
> - when plugging in 2 drives, they mount sequentially, meaning you
> have to wait for one to mount before the other will

My problem is that one drive comes up almost instantly and the other
takes 30 seconds. In fact I can live with that. My real gripe is that
the kernel makes me wait even though the drive is not being accessed.
If it just wants to make the drive available, it should be able to wait
asynchronously.

poc
_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure



[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux