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Make sure you have loaded the required Linux Kernel Modules (LKMs) for your hardware. Try first the SCSI controller for your tape.
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Make sure you have loaded the required Linux Kernel Modules (LKMs) for your hardware. Try first the SCSI controller for your tape.

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Thanks all for your suggestion we have also opened a case with storage . Will update you all soon with feedback. For now no luck
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Thanks all for your suggestion we have also opened a case with storage . Will update you all soon with feedback. For now no luck

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Thanks Duncan and Steven for your suggestion. We found the issue and solution i.e we have upgraded the NIC firmware and drivers and issue resolved. many thanks
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Thanks Duncan and Steven for your suggestion. We found the issue and solution i.e we have upgraded the NIC firmware and drivers and issue resolved. many thanks

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<div class="content wysiwyg-content">
Hi All,<br />
<br />
I have rhel 6.4 on UCS Hardware c220M3 server. there were few Luns and tape drives we were using.<br />
<br />
Then we have upgraded UCS firmware of the server its wrking fine but after few days we did kernel and os upgrade from RHEL 6.4 to RHEL 6.6 and now we are not able to see any Luns or tape on the server. even we checked dmesg no attached disk anywhere.<br />
<br />
Please help what could be the issue.
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Hi All,

I have rhel 6.4 on UCS Hardware c220M3 server. there were few Luns and tape drives we were using.

Then we have upgraded UCS firmware of the server its wrking fine but after few days we did kernel and os upgrade from RHEL 6.4 to RHEL 6.6 and now we are not able to see any Luns or tape on the server. even we checked dmesg no attached disk anywhere.

Please help what could be the issue.

disks not visible after OS upgrade linux

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.