Sounds very much like an electrical supply problem. Does it ever affect host-powered peripherals or just ones powered off AC mains? Are you using a UPS? Try an alternate psu in the system. or running on just one psu module at a time if you have redundant modules. This system isn't a bulk storage system with tonnes of hdds, is it? You mention the lspci and lsusb you included earlier were taken AFTER the problem. What differences are there immediately after a fresh boot before the problem occurs. add -t to lsusb. On Wed, Jun 11, 2014 at 2:30 PM, Lists <lists at benjamindsmith.com> wrote: > I have a freshly built, updated EL6 system and am having problems with > USB stability - at boot everything works fine but within a few hours, > USB devices start disappearing randomly. At first I though the USB > devices were suspect, but removing the suspect devices and an accessory > PCIE USB card hasn't changed anything. As of now, a single USB device is > working. (which is lucky, it hosts the OS) I've rebooted the server > several times trying to diagnose the problem. After a reboot, everything > works great - for a while. Is this a driver issue or just a bum > motherboard/chipset? > > The system is built based on the SUPERMICRO MBD-X9SCM-F-O available here: > http://www.newegg.com/Product/Product.aspx?Item=N82E16813182253 > > According to the OS compatibility matrix, the most recent CentOS 6.5 is > supported: > http://www.supermicro.com/support/resources/OS/C204.cfm > and all yum updates have been applied. > > I have the output of /var/log/messages since the last reboot here: > http://hal.schoolpathways.com/lastboot.txt > > Notes: Everything was working after the boot. Devices read/wrote fine. > > ata9.00 HD errors are known, it's the old ATA O/S drive. > > Jun 11 01:07:36: Problem begins shortly after leaving for the day, > > Jun 11 03:35:44 sdi goes offline, it's one of the two USB boot devices > and is plugged into the USB port directly on the main board. (IE: It's > not a bad cable) > > Jun 11 15:53:43 b2012 goes offline, it's mounted USB. > > > Here's the output of lspci (Note, this is when the system is having a > problem) > 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core > processor DRAM Controller (rev 09) > 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network > Connection (rev 05) > 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset > Family USB Enhanced Host Controller #2 (rev 05) > 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset > Family PCI Express Root Port 1 (rev b5) > 00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset > Family PCI Express Root Port 5 (rev b5) > 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset > Family USB Enhanced Host Controller #1 (rev 05) > 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5) > 00:1f.0 ISA bridge: Intel Corporation C204 Chipset Family LPC Controller > (rev 05) > 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset > Family SATA AHCI Controller (rev 05) > 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family > SMBus Controller (rev 05) > 01:00.0 SATA controller: JMicron Technology Corp. JMB363 SATA/IDE > Controller (rev 03) > 01:00.1 IDE interface: JMicron Technology Corp. JMB363 SATA/IDE > Controller (rev 03) > 02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network > Connection > 03:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA > G200eW WPCM450 (rev 0a) > > And here is the output of lsusb: (Again, after the problem appears) > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub > Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon > Bus 001 Device 004: ID 13fe:5200 Kingston Technology Company Inc. > Bus 001 Device 005: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB > > I plan on verifying/updating the BIOS tonight. Is there any other > information that I could provide to help diagnose this? > > -Ben > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Billy Crook • Network and Security Administrator • RiskAnalytics, LLC