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High-End Arrays
107
MegaCli64 -LDSetProp -DisDskCache -Lall -aALL
Note
Hardware RAID cards recharge their batteries while the system is operational. If a system is
powered off for an extended period of time, the batteries will lose their charge, leaving stored data
vulnerable during a power failure.
High-End Arrays
High-end arrays have various ways of protecting data in the event of a power failure. As such, there is
no need to verify the state of the internal drives in external RAID storage.
NFS
NFS clients do not need to enable write barriers, since data integrity is handled by the NFS server
side. As such, NFS servers should be configured to ensure data persistence throughout a power loss
(whether through write barriers or other means).
- Red Hat Enterprise Linux 6 1
- Administration Guide 1
- Storage Administration Guide 2
- Enterprise Linux 6 3
- Edition 0 3
- 1. Document Conventions 9
- 1.2. Pull-quote Conventions 10
- 1.3. Notes and Warnings 11
- 2.1. Do You Need Help? 11
- 2.2. We Need Feedback! 12
- Overview 13
- Storage Considerations During 15
- Installation 15
- 2.3. Special Considerations 16
- LVM (Logical Volume Manager) 19
- 3.1. What is LVM2? 20
- 3.2. Using system-config-lvm 20
- 3.2.3. Migrating Extents 25
- 3.3. References 33
- Partitions 35
- 4.2. Creating a Partition 37
- 4.2.3. Add to /etc/fstab 38
- 4.3. Removing a Partition 39
- 4.4. Resizing a Partition 39
- File System Structure 41
- 5.2.1.2. The /boot/ Directory 43
- 5.2.1.3. The /dev/ Directory 43
- 5.2.1.9. The /proc/ Directory 45
- 5.2.1.11. The /srv/ Directory 45
- 5.2.1.12. The /sys/ Directory 45
- 5.2.1.13. The /usr/ Directory 46
- 5.2.1.14. The /var/ Directory 47
- The Ext3 File System 51
- New Mount Option: data_err 52
- More Efficient Storage Use 52
- The Ext4 File System 55
- Global File System 2 59
- The XFS File System 61
- 9.3. XFS Quota Management 63
- Setting Project Limits 64
- end: ino 1 offset 0 67
- mfile end: ino 1 offset 0 67
- Network File System (NFS) 69
- 10.1.1. Required Services 70
- 10.3. autofs 72
- 10.3.2. autofs Configuration 74
- 10.6.2. The exportfs Command 82
- 10.7. Securing NFS 84
- 10.7.2. Host Access in NFSv4 85
- 10.7.3. File Permissions 85
- 10.8. NFS and rpcbind 86
- 10.9. Using NFS over TCP 87
- 10.10. References 88
- FS-Cache 89
- 11.1. Performance Guarantee 90
- 11.2. Setting Up a Cache 90
- 11.3.1. Cache Sharing 91
- 11.5. Statistical Information 93
- 11.6. References 94
- Encrypted File System 95
- 12.2. Additional Information 96
- 13.1. What is RAID? 97
- 13.2. Who Should Use RAID? 97
- 13.3. RAID Types 97
- Software RAID 98
- 13.5. Linux RAID Subsystems 100
- 13.7. Configuring RAID Sets 101
- Swap Space 103
- 14.2.3. Creating a Swap File 104
- 14.3. Removing Swap Space 105
- 14.4. Moving Swap Space 106
- Disk Quotas 107
- 15.2. Managing Disk Quotas 110
- Best method for most systems 111
- 15.3. References 112
- Access Control Lists 113
- 16.3. Setting Default ACLs 114
- 16.4. Retrieving ACLs 114
- 16.7. References 116
- Write Barriers 117
- Disabling Write Caches 118
- Battery-Backed Write Caches 118
- High-End Arrays 119
- 18.2. Userspace Access 122
- 18.3. Standards 122
- 18.4. Stacking I/O Parameters 123
- 0, and minimum_io_size is a 124
- File System tools 125
- Solid-State Disk Deployment 131
- Guidelines 131
- 20.2. Tuning Considerations 132
- Online Storage Management 133
- 21.2. iSCSI 135
- 21.3. Persistent Naming 135
- 21.3.1. WWID 136
- Important 137
- local timeout=20 142
- local done=1 142
- 21.16.1. Fibre Channel 154
- SCSI Error Handler 156
- 21.16.3. iSCSI Root 157
- 21.18. Troubleshooting 158
- 22.1. Virtual Storage 161
- 22.2. DM-Multipath 161
- Appendix A. Revision History 163
- Glossary 165
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