Novell Open Enterprise Server 2 System Administration Manual page 6

4.2
5 Using Software RAID1 Devices for Data Fault Tolerance
5.1
5.2
6 Using Software RAID0 Devices to Enhance Disk I/O Performance
6.1
6.2
7 Optimizing Disk and Cache Performance for Traditional Volumes
7.1
7.2
7.3
7.4
7.5
8 Troubleshooting
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
6 OES 2: NetWare Traditional File System Administration Guide
4.1.5 Suspending File Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Salvaging and Purging Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2.1 Configuring Salvage for All NSS Volumes on the Server. . . . . . . . . . . . . . . . . . . . . . 32
4.2.2 Salvaging Deleted Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2.3 Purging Deleted Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Planning Your Software RAID1 Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.1.1 Fault Tolerance for Traditional Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.1.2 Key Concepts for Mirroring Traditional NetWare Partitions . . . . . . . . . . . . . . . . . . . . 36
5.1.3 Improving Fault Tolerance for Software RAID1 Devices with Duplexing . . . . . . . . . . 36
5.1.4 Example Software RAID1 Solution for Fault Tolerance of Traditional Volumes. . . . . 37
Managing Traditional Software RAID1 Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.1 Mirroring Partitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2.2 Unmirroring Partitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.3 Recovering Data from an Out of Sync Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Planning Your Software RAID0 Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Managing Traditional Software RAID0 Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Optimizing Storage Disk Capacity for Traditional Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.1.1 Saving Disk Space with Block Suballocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.1.2 Disable Read-After-Write-Verify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.1.3 For 16-Bit Disk Adapters, Increase the Number of Reserved Buffers Below 16 MB . 44
7.1.4 Use Drivers that Support Scatter/Gather Functionality . . . . . . . . . . . . . . . . . . . . . . . 44
7.1.5 Provide a Disk Large Enough for a Memory Core Dump . . . . . . . . . . . . . . . . . . . . . . 44
7.1.6 Select Segments for Volumes from Different Disks . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.1.7 Monitor Free Space in Volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Improving Disk Reads on Traditional Volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.2.1 Change Concurrent Disk and Directory Writes for Faster Reads for Traditional
Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.2.2 Change the Turbo FAT Wait Time for Faster Reads of Traditional Volumes. . . . . . . 46
Improving Disk Writes for Traditional Volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.3.1 Increase the Number of Concurrent Writes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.3.2 Change Disk and Directory Caching for Faster Writes . . . . . . . . . . . . . . . . . . . . . . . 47
7.3.3 Turn Off Read-After-Write Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Configuring SET Parameters for the NetWare Traditional File System . . . . . . . . . . . . . . . . . . 48
Configuring Common File System SET Parameters for NetWare . . . . . . . . . . . . . . . . . . . . . . 49
Resolving File I/O Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Resolving Volume I/O Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Resolving Problems When the Server Hangs after Mounting the Last Volume . . . . . . . . . . . . 52
Resolving Problems When No Volumes Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Resolving Problems When Only Some Volumes Mount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Resolving Disk Error Problems When a Volume is Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . 53
Resolving Memory Errors When a Volume Is Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Resolving Volume Mounting Problems Caused by Corrupted Directory Entry Tables or File
Allocation Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
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43
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