Release Notes— Fluid Cache for SAN for Linux Systems Release Notes— Fluid Cache for SAN 2.0.0 for Linux Systems Build Version: 2.0.
Release Notes— Fluid Cache for SAN for Linux Systems Contents SOFTWARE AND HARDWARE COMPATIBILITY ....................................................................................................... 3 FIRMWARE AND DRIVER COMPATIBILITY .............................................................................................................. 4 LINUX OPERATING SYSTEM DEPENDENCIES ...........................................................................................................
Release Notes— Fluid Cache for SAN for Linux Systems Software and Hardware Compatibility Table 1 Hardware and Software Requirements Element Requirement Servers Dell PowerEdge systems that support Dell Express Flash PCIe SSDs: M620, M820, R620, R720, R820, R920, T620, R730, R730XD, R630, or T630 Operating Systems • • • • • RAM and Hard Disk Space • Minimum of 64 GB RAM • 150 GB of available disk space Cache Device • Express Flash PCIe SSD of either 175GB, 350GB, 400GB, 800GB, or 1.
Release Notes— Fluid Cache for SAN for Linux Systems Firmware and Driver Compatibility Table 2 Firmware and Driver Minimum Versions Element Minimum Version Mellanox ConnectX-3 Drivers SLES 11 SP3: 2.0-2.6.8 RHEL 6.4: 2.0-2.6.8 RHEL 6.5: 2.3-1.0.1 OEL 6.4: 2.0-2.6.8 3 OEL 6.5: 2.3-1.0.1 2.30.5118 Micron: 3.3.0 Samsung: 1.11 Micron: B1490908 Samsung: IPM0DD3Q170 2.1.6 1.7.3 2.1.3 2.1.3 1.7.2 1.2.2 2.1.2 1.51.51 1.3.0.
Release Notes— Fluid Cache for SAN for Linux Systems Linux Operating System Dependencies To check which dependencies are currently installed on your system, run the following command: rpm –qa Ensure that the following open source component packages are available in your system before you install Fluid Cache for SAN. See the operating system distribution media for the supported version of each package. The following dependencies are required for RHEL, except as noted. The dependencies for SLES are similar.
Release Notes— Fluid Cache for SAN for Linux Systems Installation Instructions Refer to the Deployment Guide for complete installation instructions. However, before deploying Fluid Cache you must verify the digital signature of the Fluid Cache package. Verifying the Digital Signature of a Package To verify a digital signature on a Linux system, you must have the Gnu Privacy Guard (GPG) package installed. 1. Get the Dell Linux public GnuPG key by searching http://pgp.mit.
Release Notes— Fluid Cache for SAN for Linux Systems Known Issues Arising from Third Party Software The following issues are not caused by Fluid Cache itself, but arise from known issues in third party software. Low Memory Handling Issues ISSUE: When the system is low on memory, memory allocation errors, I/O timeouts, and EAGAIN errors (resource temporarily unavailable) may appear. WORKAROUND: Add or free up RAM memory.
Release Notes— Fluid Cache for SAN for Linux Systems XFS Hangs During File System Creation ISSUE: On RHEL 6.4, the XFS files system may become unresponsive. During creation of the file system, this may occur because of a deadlock between the xfssyncd and xfsbufd daemons. Consequently, several kernel threads become unresponsive and the XFS file system cannot be successfully created, leading to a kernel oops. A patch is available to prevent this situation by forcing the active XFS log onto a disk.
Release Notes— Fluid Cache for SAN for Linux Systems Known Issues in Fluid Cache for SAN 2.0.0 The following are known issues in Fluid Cache for SAN 2.0.0 Removing a Server from a Cluster ISSUE: If you try to remove a server from a cluster before shutting down the server, Enterprise Manager displays a message saying that the action is not allowed. WORKAROUND: Shut down the server: In Enterprise Manager, locate the server, right-click, and select Shut Down.
Release Notes— Fluid Cache for SAN for Linux Systems WORKAROUND: Image a fourth node and add it to the cluster, then remove the failed node from the cluster.
Release Notes— Fluid Cache for SAN for Linux Systems File Systems Table (fstab) Settings Prevent Server from Starting ISSUE: The server can fail to boot because of errors related to setting non-zero fs_passno field in the /etc/fstab file. Setting the force fsck option causes the system boot to fail. This is because the devices do not exist at boot time when fstab is processed. When the error occurs, the following message is displayed: /dev/fldc0 is mounted. e2fsck: Cannot continue, aborting.
Release Notes— Fluid Cache for SAN for Linux Systems Root File System Fills Up ISSUE: Fluid Cache may fail and require manual intervention if the root file system on a node becomes full. The cluster may still be operational, but error messages are generated and Fluid Cache is not fully functional. WORKAROUND: Please contact Dell Customer Support for the steps required to return the node to full functionality.
Release Notes— Fluid Cache for SAN for Linux Systems Use of Kpartx to Partition Volumes ISSUE: When using the kpartx command to partition volumes, the partition table on shared block devices is in an inconsistent state across the cluster. For instance, partitions created on a LUN on one node may not be seen by other nodes. WORKAROUND: Kpartx is not supported for partitioning a cached volume. Use the partprobe command instead.
