* Kernel Startup Delay @ 2001-08-21 16:11 ` Mark Cuss 2001-08-21 17:02 ` Ignacio Vazquez-Abrams ` (2 more replies) 0 siblings, 3 replies; 5+ messages in thread From: Mark Cuss @ 2001-08-21 16:11 UTC (permalink / raw) To: linux-kernel Hello! I am setting up a server with 4 SCSI hard disks, two of which I will jumper to have a delayed spin up as to not bake the power supply. These two drives will contain a striping RAID. I am concerned that the kernel will load off of the other drives and attempt to start this RAID before the disks have even spun up - is there a way to have the kernel delay its startup for a certain number of seconds while all the drives spin up? Any hints are greatly appreciated. Mark ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel Startup Delay 2001-08-21 16:11 ` Kernel Startup Delay Mark Cuss @ 2001-08-21 17:02 ` Ignacio Vazquez-Abrams 2001-08-21 19:01 ` Colonel 2001-08-22 6:00 ` Jim Roland 2 siblings, 0 replies; 5+ messages in thread From: Ignacio Vazquez-Abrams @ 2001-08-21 17:02 UTC (permalink / raw) To: linux-kernel On Tue, 21 Aug 2001, Mark Cuss wrote: > Hello! > > I am setting up a server with 4 SCSI hard disks, two of which I will jumper > to have a delayed spin up as to not bake the power supply. These two drives > will contain a striping RAID. I am concerned that the kernel will load off > of the other drives and attempt to start this RAID before the disks have > even spun up - is there a way to have the kernel delay its startup for a > certain number of seconds while all the drives spin up? > > Any hints are greatly appreciated. > > Mark I thought that this was a function of the SCSI BIOS? I know that with the Adaptec AHA-x940xx and AIC-78x0 you can tell the card/chip to spin up the drives after individually-configurable delays, and then continue booting the system once all the drives have spun up. Does your card/chip have a similar feature? -- Ignacio Vazquez-Abrams <ignacio@openservices.net> ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel Startup Delay 2001-08-21 16:11 ` Kernel Startup Delay Mark Cuss 2001-08-21 17:02 ` Ignacio Vazquez-Abrams @ 2001-08-21 19:01 ` Colonel 2001-08-22 6:00 ` Jim Roland 2 siblings, 0 replies; 5+ messages in thread From: Colonel @ 2001-08-21 19:01 UTC (permalink / raw) To: linux-kernel In clouddancer.list.kernel, you wrote: > >Hello! > >I am setting up a server with 4 SCSI hard disks, two of which I will jumper >to have a delayed spin up as to not bake the power supply. These two drives >will contain a striping RAID. I am concerned that the kernel will load off >of the other drives and attempt to start this RAID before the disks have >even spun up - is there a way to have the kernel delay its startup for a >certain number of seconds while all the drives spin up? > >Any hints are greatly appreciated. You will find that the BIOS will wait for the drive spin up. I use 9 drives and power 'on' takes a few minutes. Additionally, the control electronics is active on the drives, which would delay any attempt to start RAID. -- Windows 2001: "I'm sorry Dave ... I'm afraid I can't do that." ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel Startup Delay 2001-08-21 16:11 ` Kernel Startup Delay Mark Cuss 2001-08-21 17:02 ` Ignacio Vazquez-Abrams 2001-08-21 19:01 ` Colonel @ 2001-08-22 6:00 ` Jim Roland 2 siblings, 0 replies; 5+ messages in thread From: Jim Roland @ 2001-08-22 6:00 UTC (permalink / raw) To: mcuss, linux-kernel I'm sure others have contributed to this, but depending on how much delay you're talking about, you may be able to set a startup delay via your SCSI BIOS (reference the settings screen showing all SCSI IDs and settings for each) if you have an Adaptec AHA2940, I know you can do this. Others you may need to taste before adding seasoning. If you don't want to, or are unable to adjust the SCSI Controller's BIOS, you can insert a startup delay if you're using LILO, and have it wait "x" seconds which you can adjust in tenths of seconds (50=5 seconds) and have LILO wait before starting the kernel enough time for your drives to startup. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Jim Roland, RHCE (RedHat Certified Engineer) Owner, Roland Internet Services "The four surefire rules for success: Show up, Pay attention, Ask questions, Don't quit." --Rob Gilbert, PH.D. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ----- Original Message ----- From: "Mark Cuss" <mcuss@cdlsystems.com> To: <linux-kernel@vger.kernel.org> Sent: Tuesday, August 21, 2001 11:11 AM Subject: Kernel Startup Delay > Hello! > > I am setting up a server with 4 SCSI hard disks, two of which I will jumper > to have a delayed spin up as to not bake the power supply. These two drives > will contain a striping RAID. I am concerned that the kernel will load off > of the other drives and attempt to start this RAID before the disks have > even spun up - is there a way to have the kernel delay its startup for a > certain number of seconds while all the drives spin up? > > Any hints are greatly appreciated. > > Mark > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > ^ permalink raw reply [flat|nested] 5+ messages in thread
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* Re: Kernel Startup Delay [not found] <no.id> @ 2001-08-21 16:26 ` Alan Cox 0 siblings, 0 replies; 5+ messages in thread From: Alan Cox @ 2001-08-21 16:26 UTC (permalink / raw) To: mcuss; +Cc: linux-kernel > to have a delayed spin up as to not bake the power supply. These two drives > will contain a striping RAID. I am concerned that the kernel will load off > of the other drives and attempt to start this RAID before the disks have > even spun up - is there a way to have the kernel delay its startup for a > certain number of seconds while all the drives spin up? The kernel scsi code issues test-unit-ready commands and will (should 8)) do the right things and wait for the drives to spin up. Alan ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2001-08-22 6:00 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <9lu1js$s3o$1@ns1.clouddancer.com> 2001-08-21 16:11 ` Kernel Startup Delay Mark Cuss 2001-08-21 17:02 ` Ignacio Vazquez-Abrams 2001-08-21 19:01 ` Colonel 2001-08-22 6:00 ` Jim Roland [not found] <no.id> 2001-08-21 16:26 ` Alan Cox
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