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Date:      Thu, 28 Oct 1999 13:31:29 -0700
From:      GVB <gvbmail@tns.net>
To:        Greg Lehey <grog@lemis.com>
Cc:        FreeBSD Questions <questions@FreeBSD.org>
Subject:   Re: question regarding IO
Message-ID:  <4.2.1.19991028132501.01748238@mail.tns.net>
In-Reply-To: <19991028143848.50705@mojave.worldwide.lemis.com>
References:  <4.2.1.19991028113702.017dfed0@mail.tns.net> <4.2.1.19991025143751.017b2af0@abused.com> <4.2.1.19991025143751.017b2af0@abused.com> <19991026222942.39556@mojave.worldwide.lemis.com> <4.2.1.19991028113702.017dfed0@mail.tns.net>

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To answer your original question of my dmesg output for my hardware, it is 
as follows;

dpt0: <DPT Caching SCSI RAID Controller> rev 0x02 int a irq 12 on pci0.10.0
dpt0: DPT PM2144UW FW Rev. 07M1, 1 channel, 64 CCBs
da0 at dpt0 bus 0 target 0 lun 0
da0: <IBM DDRS-34560W S92A> Fixed Direct Access SCSI-2 device
da0: Tagged Queueing Enabled
da0: 4357MB (8924999 512 byte sectors: 255H 63S/T 555C)
da1 at dpt0 bus 0 target 1 lun 0
da1: <IBM DDRS-34560W S92A> Fixed Direct Access SCSI-2 device
da1: Tagged Queueing Enabled
da1: 4357MB (8924999 512 byte sectors: 255H 63S/T 555C)
da2 at dpt0 bus 0 target 2 lun 0
da2: <DPT MAIL RAID 07M1> Fixed Direct Access SCSI-2 device
da2: 17365MB (35565440 512 byte sectors: 255H 63S/T 2213C)

da0 is my OS disk, da1 is a spare disk (doing nothing right now.. have not 
established the mirror yet..) and da2 is partioned into /var/mail and 
/var/spool/mqueue.

thanks.
GVB

At 02:38 PM 10/28/1999 -0400, Greg Lehey wrote:
>[Format recovered--see http://www.lemis.com/email/email-format.html]
>
>On Thursday, 28 October 1999 at 11:38:08 -0700, GVB wrote:
> > At 10:29 PM 10/26/1999 -0400, you wrote:
> >> When replying to this message, please copy the original recipients.
> >> For more information, see http://www.lemis.com/questions.html
> >>
> >> On Monday, 25 October 1999 at 14:48:01 -0700, GVB wrote:
> >>> I am running a small ISP 100% on FreeBSD.  I wanted to add a level of
> >>> redundancy to our mail server so I purchased the Raidstation3 kit 
> from DPT
> >>> which includes an external 3 bay drive enclosure and a PCI raid
> >>> controller.  I populated the controller with 64 megs of ram and 
> popped in 3
> >>> Ultra2 10,000rpm Seagate Cheetah drives.  I built the raid and 
> mounted the
> >>> two partitions as /var/mail and /var/spool/mail.  I now get strange
> >>> unresponsive timeouts from the machine at random times.. this is what
> >>> iostat looks like when the machine is unresponsive, sometimes up to 10
> >>> seconds at a time.  This was not happening before installing this RAID so
> >>> it leads me to believe that the file system is the problem.
> >>>
> >>>        tty             da0              da1              da2
> >>  cpu
> >>>   tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni 
> sy in id
> >>>     0   76  0.00   0  0.00   0.00   0  0.00  64.00   1  0.06   5  0 
> 1 15 79
> >>>
> >>> What does the KB/t mean,
> >>
> >> It's the average size of the transfers.  FreeBSD is limited to 128
> >> kB/t, but in practice never goes beyond 64 kB.
> >>
> >>> it seems that it never gets past 64 and when it hits 64 the machine
> >>> becomes unresponsive.
> >>
> >> This might be a DPT problem.
> >>
> >>> Any suggestions or pointers would be appreciated.
> >>
> >> What are the *relevant* lines of your dmesg output?  What kind of DPT
> >> controller do you have?  It may be that it's not handling 64 kB
> >> transfers correctly.
> >
> > Hey, I really appreciate the help.. just had a quick question regarding
> > dmesg.  Is there a way to get the original bootup/hardware scan information
> > from dmesg without rebooting?
>
>Yes.  I suppose I should add this to the FAQ.  It's stored in
>  /var/run/dmesg.boot.
>
> > Seems my dmesg buffer has filled up with other things (ARP
> > conflicts, core dumps, etc..).
>
>Yup, that happens.
>
>Greg
>--
>When replying to this message, please copy the original recipients.
>For more information, see http://www.lemis.com/questions.html
>When replying to this message, please take care not to mutilate the
>original text.
>For more information, see http://www.lemis.com/email.html
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