SUSE Linux Enterprise Server Documentation

1 Storage AdministrationGuideSUSE Linux Enterprise Server 11 SP4 Storage Administration GuideSUSE Linux Enterprise Server 11 SP4 Publication Date: 2015-05-12 SUSE LLC1800 South Novell PlaceProvo, UT 84606 2006 2015 SUSE Linux GmbH. and contributors. All rights is granted to copy, distribute and/or modify this document under the terms of the GNU FreeDocumentation License, Version or (at your option) version ; with the Invariant Section being thiscopyright notice and license. A copy of the license version is included in the section entitled GNUFree Documentation License .All information found in this book has been compiled with utmost attention to detail. However, this doesnot guarantee complete accuracy.

2 Neither SUSE Linux GmbH, the authors, nor the translators shall beheld liable for possible errors or the consequences This Guidexvi1 Overview of File Systems in File Systems in Linux2 Btrfs3 Ext27 Ext38 ReiserFS14 XFS15 FileSystem Feature Supported File File Support in Kernel Storage Devices with the YaST Information21 Freeing Unused Filesystem Blocks212 What s New for Storage in SLES s New in SLES 11 s New in SLES 11 SP322 Btrfs Quotas22 iSCSI LIO Target Server23 Linux SoftwareRAIDs23 LVM224 Multipath s New in SLES 11 s New in SLES 11 SP128 Saving iSCSI Target Information28 Modifying Authentication Parametersin the iSCSI Initiator29 Allowing Persistent Reservations for MPIOD evices29 MDADM

3 Boot Loader Support for MDRAIDE xternal Metadata29 YaST Install and Boot Support for MDRAIDE xternal Metadata30 Improved Shutdown for MDRAID Arrays thatContain the Root File System30 MD over iSCSI Devices30 MD-iiiStorage Administration GuideSGPIO31 Resizing LVM 2 Mirrors31 Updating Storage Drivers forAdapters on IBM s New in SLES 1131 EVMS2 Is Deprecated32 Ext3 as the Default File System33 DefaultInode Size Increased for Ext333 JFS File System IsDeprecated33 OCFS2 File System Is in the High AvailabilityRelease34 /dev/disk/by-name Is Deprecated34 DeviceName Persistence in the /dev/disk/by-id Directory34 Filtersfor Multipathed Devices35 User-Friendly Names forMultipathed Devices35 Advanced I/O Load-BalancingOptions for Multipath35 Location Change for Multipath ToolCallouts36 Change from mpath to multipath for the mkinitrd -fOption36 Change from Multibus to Failover as the Default Setting for theMPIO Path Grouping Policy363 Planning a Storage RAID System and Antivirus Support38 Open Source Backup38 Commercial Backup and Antivirus Support384 LVM the Logical Volume LVM Volume Physical Logical Activating Non-Root LVM Volume Groups51ivStorage Administration LVM2 Storage Objects51 Using LVM2 Tags52 Requirements for Creating LVM2 Tags52 Command Line Tag Syntax53 ConfigurationFile Syntax54 Using Tags for a Simple Activation Control in

4 ACluster55 Using Tags to Activate On Preferred Hosts in a a Volume a Logical Volume with a Logical Volume with a Volume an LVM Partition (Physical Volume) LVM Commands635 Resizing File for Resizing67 File Systems that Support Resizing68 Increasing the Size of a FileSystem68 Decreasing the Size of a File the Size of an Ext2, Ext3, or Ext4 File the Size of a Reiser File the Size of an Ext2 or Ext3 File the Size of a Reiser File System726 Using UUIDs to Mount Devices with UUIDs75 Using UUIDs to Assemble or Activate File System Devices75 Finding theUUID for a File System UUIDs in the Boot Loader and /etc/fstab File (x86) UUIDs in the Boot Loader and /etc/fstab File (IA64)

5 Information79vStorage Administration Guide7 Managing Multipath I/O for Multipath for Multipathing81 Guidelines for Multipathing82 PRIO Settings in Using WWID, User-Friendly, and Alias Names forMultipathed Devices86 Using LVM2 on Multipath Devices86 Usingmdadm with Multipath Devices90 Using Multipath with NetAppDevices90 Using --noflush with Multipath Devices90 SAN TimeoutSettings When the Root Device Is Multipathed91 Partitioning MultipathDevices91 Supported Architectures for Multipath I/O92 SupportedStorage Arrays for Management Tools97 Device Mapper Multipath Module98 Multipath I/O ManagementTools100 Using MDADM for Multipathed Devices102 Linuxmultipath(8) Command103 Linux mpathpersist(8)

6 The System for Multipathing111 Preparing SAN Devices for Multipathing111 PartitioningMultipath Devices112 Configuring the Device Drivers in initrd forMultipathing113 Adding multipathd to the Boot and Starting Multipath I/O or Modifying the / File115 Creating the / File116 Sections in the / Verifying the Multipath Setup in the / Applying the / File Changes to Update theMultipath Default Policies for Polling, Queueing, and Non-Multipath User-Friendly Names or Alias Default Settings for zSeries Devices128viStorage Administration Path Failover Policies and Priorities129 Configuring the Path Failover Policies129 Configuring FailoverPriorities130 Using a Script to Set Path Priorities141 ConfiguringALUA (mpath_prio_alua)

7 142 Reporting Target Path Multipath I/O for the Root Device144 Enabling Multipath I/O at Install Time145 Enabling Multipath I/O for anExisting Root Device148 Disabling Multipath I/O on the Root Multipath I/O for an Existing Software for New Devices without for New Partitioned Devices without Multipath I/O I/O in Error Stalled MPIO160 PRIO Settings for Individual Devices Fail After Upgrading to PRIO Settings with Arguments Fail After Upgrading to Technical Information s Next1618 Software RAID RAID Levels162 RAID 0163 RAID 1163 RAID 2 andRAID 3163 RAID 4164 RAID 5164 Nested RAID RAID Configuration with Software More Information167viiStorage Administration Guide9 Configuring Software RAID1 for the for Using a Software RAID1 Device for the iSCSI Initiator Support at Install Multipath I/O Support at Install a Software RAID1 Device for the Root (/) Partition17010 Managing Software RAIDs 6 and 10 with a RAID 6174 Understanding RAID 6174 Creating a RAID Nested RAID 10 Devices with mdadm176 Understanding Nested RAID Devices176 Creating Nested RAID 10 (1+0) withmdadm177 Creating Nested RAID 10 (0+1)

8 With a Complex RAID 10180 Understanding the Complex RAID10180 Creating a Complex RAID 10 withmdadm184 Creating a Complex RAID10 with the YaST a Degraded RAID Array18811 Resizing Software RAID Arrays with the Resizing Process191 Guidelines for Resizing a Software RAID191 Overview of the Size of a Software RAID193 Increasing the Size of Component Partitions193 Increasing the Size of theRAID Array195 Increasing the Size of the File the Size of a Software RAID198 Decreasing the Size of the File System199 Decreasing the Size of the RAIDA rray201 Decreasing the Size of Component Partitions202viiiStorage Administration Guide12 Storage Enclosure LED Utilities for MD LED Management Storage Enclosure Enclosure LED Monitor Service (ledmon(8))206 Syntax206 Options207 Files207 Known Enclosure LED Control Application (ledctl(8))208 Syntax209 Pattern Names209 Pattern Translation211 List ofDevices212 Options212 Files213 LED Utilities Configuration File ( (5)) Information21413 iSNS for iSNS iSNS Server for iSNS Discovery Domains218 Creating iSNS Discovery Domains219 Creating iSNS Discovery DomainSets220 Adding iSCSI Nodes to a Discovery Domain221 AddingDiscovery Domains to a Discovery Domain More Information22414 Mass Storage over IP Networks.

9 ISCSI Target and Initiator226 Installing iSCSI Target Software227 Installing the iSCSI InitiatorSoftware227ixStorage Administration Up an iSCSI Target228 Preparing the Storage Space228 Creating iSCSI Targets withYaST230 Configuring an iSCSI Target Manually233 Configuring OnlineTargets with iSCSI Initiator237 Using YaST for the iSCSI Initiator Configuration237 Setting Up the iSCSII nitiator Manually241 The iSCSI Client iSCSI Disks when iSCSI243 Hotplug Doesn t Work for Mounting iSCSI Targets244 Data PacketsDropped for iSCSI Tra c244 Using iSCSI Volumes with LVM244 iSCSIT argets Are Mounted When the Configuration File Is Set to Information24515 Mass Storage over IP Networks.

10 ISCSI LIO the iSCSI LIO Target Server the iSCSI LIO Target Service249 Configuring iSCSI LIO Startup Preferences249 Manually Starting iSCSI LIOT arget at the Command Line251 Manually Starting iSCSI LIO Target Authentication for Discovery of iSCSI LIO Targets the Storage Space255 Partitioning Devices256 Partitioning Devices in a Virtual Up an iSCSI LIO Target an iSCSI LIO Target an iSCSI LIO Target Group268xStorage Administration iSCSI LIO Target Server269 Portal Error When Setting Up Target LUNs270 iSCSI LIO Targets Are NotVisible from Other LIO Target Terminology27116 Fibre Channel Storage over Ethernet FCoE and the YaST FCoE FCoE Interfaces during the FCoE Services with FCoE with FCoE Instances with the FCoE Administration Up Partitions for an FCoE Initiator a File System on an FCoE Initiator Information28917 LVM Volume Volume Linux Snapshots with a Linux Snapshots for Virtual Machines on a Virtual a Snapshot with the Source Logical Volume to Revert Changesor Roll Back to a Previous State29518 Managing Access Control Lists over NFSv429819 Troubleshooting Storage DM-MPIO Available for the Boot Partition?