Date: Mon, 20 Dec 1999 13:41:41 -0800 From: GVB <gvbmail@tns.net> To: freebsd-questions@freebsd.org Subject: FreeBSD and RAID IO Problems Message-ID: <4.2.2.19991220133203.01c44c48@abused.com>
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I am running FreeBSD 3.3-Stable on a PentiumII 266 with 384 megs of RAM as
a SMTP/POP3 mail server.
The primary OS disk is a IBM 4.5 UW SCSI drive which is da0. da1 is
another 4.5 UW IBM drive which is GOING to be used for mirroring the OS
disk (right now its doing nothing). da2 is a 18 gig RAID setup on a DPT
Raid card using an externel 3 position RAID box that is mounted as
/var/mail and /var/spool/mqueue.
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)
My problem is that multiple times per day (at least 5 times or so per hour)
the machine stops responding for anywhere from 5-15 seconds. It still
answers incoming connections, eg; telnet to port 25 and the connection is
established, but I get nothing from the server, no identification or
anything. Same thing with any other port. When I am on the machine
locally the console locks and I cannot input until this period is over. I
have been trying to trouble shoot it down, and it seems when the KB/t hits
64.00 on the raid is when it locks.
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 1 0 1 0 98
Where can I begin to figure out what this problem is? Is it the block size
that I built the RAID with? Could it be bad memory on the RAID card or a
bad RAID card? I appreciate any help anyone can give me.
GVB
(On a side note.. does anyone know if there has been any RAID management
software released that will work with FreeBSD and this card?)
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