[arch-general] scsi_mod.use_blk_mq (revisited)

Randy DuCharme radio.ad5gb at gmail.com
Fri May 11 22:21:01 UTC 2018

Well, I was trying the same thing but via GRUB_PRELOAD_MODULES (which
didn't work) so gave this a go.
Still didn't work.  First I just added just "megaraid_sas" which failed to
solve it, so then I added a bunch.  Just
about everything "(MODULES=(megaraid_sas xfs scsi_mod libcrc32c ahci
xhci_pci ohci_pci ehci_pci xhci_hcd
ohci_hcd ehci_hcd sr_mod sd_mod libata shpchp i2c_piix4 sp5100_tco k10temp
fam15h_power nouveau nvidia_drm nvidia) )"
but it still takes nearly 30 seconds for the sdX devices to appear with
blk-mq enabled.  Strange.

Thanks for your thoughts though.  I'm not done banging on it yet.

Kind regards

On Fri, May 11, 2018 at 5:38 AM LoneVVolf <lonewolf at xs4all.nl> wrote:

> On 11-05-18 06:57, Randy DuCharme via arch-general wrote:
> > Greetings again,
> >
> > I've been continuing to fool with this.  I'm hoping someone smarter
than I
> > can shed a little more light on it.  Here's what I've discovered since
> > last post.....
> >
> > It seems that on my system, it takes more than the allowed 10 seconds
> > the disks to appear.  I removed "quiet" from my boot command line and it
> > timed out looking for UUID=xxxx..... .  So I looked for it and it
> > definitely was not there.  None of the sdXx devices were.  I looked
> > and yet again (ls /dev/sd*) and after about the 3rd or 4th attempt they
> > showed up.  So then, I mounted /dev/sdc3 to /new_root/, typed 'exit' and
> > after a warning about possibly failing to run as a user instance, it
> >
> > Any clues as to why this occurs?  I'm trying to find a way to increase
> > pre-boot disk probe timer if possible.  So far, all I've found are tips
> > about speeding up the boot process, not slowing it down.
> >
> > Many thanks in advance.
> >
> In order for your drives to be detected the kernel modules needed by the
> hardware must be loaded and active.
> Your description matches a situation where some needed module is loaded
> too late in the boot process.

> Use lspci -k to determine which kernel modules are needed for your sata
> / raid controllers and add that one to the modules= line in
> mkinitcpio.conf .
> Incase it's unclear which module is needed, try the one that handles the
> boot parameter (scsi_mod) .

> LW

Randall DuCharme (Radio AD5GB)
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