At IBM, the out-of-the-box output of ipmitool sol info 1 generally indicates what speed of SOL we tested and feel comfortable with for a given system. I don't know what other vendor's policies are. 19200 is the most common setting among our currently shipping product. But even then, ubiquitous CTS/RTS is highly suggested.
Also, with respect to grub and serial, on our servers I at least generally
disable the serial config from grub and let 'serial redirection after post'
handle it. If you have both grub and serial redirection after post
enabled, sometimes weird unfortunate things can happen. At least in our
BIOS, linux will cleanly take control over the serial controller and
cleanly transition from BIOS redirection while grub and syslinux do not
fare so well. It has the bonus of using only serial output facilities that
explicitly supports CTS/RTS.
From: Corey Minyard <miny...@acm.org>
To: Alessandro Zummo <azummo-lists-ipmitool-de...@towertech.it>
Cc: ipmitool-devel@lists.sourceforge.net
Date: 03/12/2009 11:46 AM
Subject: Re: [Ipmitool-devel] serial over lan on Dell PowerEdge R200
Alessandro Zummo wrote:
> On Wed, 11 Mar 2009 20:11:59 -0500
> Corey Minyard <miny...@acm.org> wrote:
>
>
>
>>> The next logic step was to try serial over lan. I've tried
>>> both ipmitool isol and the dell redirector software
>>> (dsm_bmu_solproxy32d).
>>>
>
>
>> Try enabling cts/rts flow control. At the login, do:
>> stty crtscts
>> and that might solve the problem. It works a lot better for me.
>>
>> Depending on the getty you use, you can do this in /etc/inittab. Do a
>> "man getty" to figure it out.
>>
>
> thank you very much, that helped. I now configured grub to use
> the serial port and the kernel to have a console on both vga and serial.
>
NP, glad I could help.
> grub itself doesn't support enabling rtscts so it probably works because
> it has been enabled by the previous boot.
>
It's possible, but you can force it on by doing a
"console=ttySn,115200n81r. The "r" on the end turns on rts/cts.
> I can see most of the boot sequence, however the kernel must be
disrupting
> the console redirection, even if I've set Redirection After Boot, 'cos I
> cannot see the all the output (no fsck or init.d scripts for example).
>
Yes, as soon as the kernel driver takes over the port it will turn off
rts/cts. You can turn it back on early in the boot sequence by adding
something early in /etc/rcS.d to enable it again.
> according to the ipmitool output it should support speeds up to 115.2
> bit-rate 9.6 | 19.2 | 38.4 | 57.6 | 115.2
> but setting them fails with
> Error setting ISOL parameter 'bit-rate': Parameter out of range
>
> that happens with Dell's redirector too so I guess is a limit of
> the BMC.
>
BMCs are traditionally very slow and can't keep up at 115.2. In fact,
they can't keep up at 19.2, generally.
-corey
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