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Adaptec 5325301507 Administration Guide - Page 74

Configuring Write Cache, Checking Filesystems

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Volumes them). The security model determines the file-level security scheme that will apply to files and folders within the volume or SnapTree directory. Configuring Write Cache Note Not related to write cache on iSCSI disks. For information about configuring write cache on iSCSI disks, see "Write-Cache Options with iSCSI Disks" on page 89. By default, write cache is enabled on all volumes. For systems that do not use a UPS device to help protect data during a power outage or for applications that require synchronous writes to disk, write cache can be disabled on a volume by volume basis. When a volume's write cache is disabled, all data written to the volume bypasses memory buffers and writes directly to disk, helping to protect the data when writes are occur during a power outage. While disabling write cache does help protect data, it also significantly impacts disk write performance. For the procedures to disable write cache on new and existing volumes, see To Disable/ Enable Write Cache on a New Volume or To Disable/Enable Write Cache on an Existing Volume. Note When write cache is disabled on a volume, disk cache is also disabled on all disk drives that are members of the RAID or RAID group hosting the volume. This can impact performance on other volumes with write cache enabled that are hosted by the same RAID or RAID group. Note Not all disk drives support disabling write cache. If any of the volume's drives are IDE drives, you will not have the option to disable write cache for that volume. In addition, write cache can not be disabled on SnapServer 18000 or the SD30 expansion unit. Checking Filesystems Filesystems on individual volumes can be checked for errors and repaired, if necessary. The root volume can also be checked, and any errors found will automatically be repaired. Since the GuardianOS automatically checks the root volume for errors if any of a number of triggers occurs (e.g., a power outage, failure of the volume to mount, etc.), it is recommended that the root filesystem check feature only be used when directed by a Technical Support representative. See the Volumes section in the Online Help for procedures to check the volume filesystems. 58 SnapServer Administrator Guide

Section	Page
Title Page	1
Contents	7
Preface	13
1 - Administrative Overview	17
GuardianOS Specifications	18
What’s New in GuardianOS	22
SnapServer Manager	28
Connecting to the Server for the First Time	30
Using the Initial Setup Wizard	32
Determining Capacity	33
Scheduling Data Protection Tasks	34
Migrating Data from Legacy Servers to the SnapServer	35
Configuring the SnapServer as a Print Server	35
Configuring the SnapServer as a Simple Web Server	35
Configuring an APC-Brand UPS	35
SnapExtensions	36
Wake-on-LAN Support	36
2 - Network Access to the Server	37
Viewing Current Network Settings	38
TCP/IP Options	39
Configuring TCP/IP Settings	41
Default Network Protocol Settings	44
Windows Networking Configuration	45
Support for Windows Networking (SMB)	45
Support for Windows Network Authentication	46
NFS Access	49
Apple Networking Configuration	50
FTP/FTPS Access	52
HTTP/HTTPS Access	53
Web View	54
DHCP Server	55
Print Server	55
3 - User & Group Management	59
Default User and Group Settings	60
UID and GID Assignments	60
Local Users and Groups	61
NIS Domain	63
4 - Storage Configuration and Expansion	65
Default Storage Configuration	66
Changing the Default Storage Configuration	67
RAIDs	67
RAID Groups	70
Volumes	72
Quotas	76
Setting User Quotas	76
Data Migration	77
Preserving Permissions	77
Expansion Arrays	79
SnapServer EXP E2000	79
Snap Expansion S50	80
Managing Expansion Array Storage	81
Integrating Orphan Expansion Units	82
Disks and Units	83
Replacing Disk Drives on a RAID	83
Adding Disk Drives to a RAID	84
Adding New Disk Drives to Increase Capacity	84
Hot Swapping Disk Drives	86
5 - iSCSI Disks	93
Configuring iSCSI Initiators	94
iSCSI Configuration for Microsoft Windows using MS Initiator	95
Configuring the QLogic QLA4010 and QLA4050/52c iSCSI Initiators for Microsoft Windows	100
iSCSI Configuration for Linux and UNIX	101
iSCSI Configuration for Novell NetWare	102
iSCSI Configuration for VMware	102
iSCSI Configuration for Mac	103
iSCSI Configuration on the SnapServer	104
Creating iSCSI Disks	107
Configuring VSS/VDS for iSCSI Disks	109
6 - Share and File Access	111
Configuring Share and Folder Security Overview	112
Components and Options	115
SnapTrees and Security Models	116
ID Mapping	118
Shares	119
Configuring Share Access	121
Share Access Behaviors	121
Setting User-based Share Access Permissions	122
Creating Home Directories	122
Windows ACLs	123
Setting File and Directory Access Permissions and Inheritance (Windows)	124
Security Guides	125
7 - Snapshots	127
Snapshot Management and Usage	128
Estimating Snapshot Pool Requirements	129
Adjusting Snapshot Pool Size	130
Accessing Snapshots	130
Coordinating Snapshot and Backup Operations	131
8 - Disaster Recovery	133
Backing Up Server and Volume Settings	133
Backing Up the NetVault Database Directory	136
Recovering the NetVault Database	137
Disaster Recovery Procedural Overview	139
Cloning a Server	140
9 - CA eTrust Antivirus Software	141
Antivirus Dependencies	142
Launching the CA eTrust Antivirus GUI	143
The Local Scanner View	143
Scan Job Configuration and Scheduling	144
Defining Scan Jobs	144
Running a Manual Scan Job	146
Scheduling a Scan Job	146
Signature Updates	147
Updating SnapServers that have Internet Access	148
Updating a SnapServer that does not have Internet Access	148
Distributing Updates from One Server to Another	149
Verifying Download Events	151
Alert Options	151
The Move Directory	152
Log View	153
10 - Unicode	155
What is Unicode?	155
Converting to Unicode	155
Unicode and Protocol Interaction	157
How Snapshots Interact with Unicode	159
Backing Up Unicode Servers	159
Unicode and Expansion Arrays	161
A - Backup and Replication Solutions	163
Integrated Backup Solutions for the SnapServer	164
BakBone Netvault	164
Snap Enterprise Data Replicator (Snap EDR)	165
Off-the-Shelf Backup Solutions for the SnapServer	167
Preparing to Install a Backup Solution	167
Preinstallation Tasks	168
Installing the CA BrightStor ARCserve Agent	169
Installing the Symantec Backup Exec RALUS Agent	172
Installing the Symantec NetBackup v6.5 Client	175
Installing the EMC Legato NetWorker Client	177
Backup of iSCSI Disks	182
B - Command Line Interface	183
SnapCLI Syntax	183
SnapCLI Commands	186
Scripts in SnapCLI	193
C - Troubleshooting SnapServers	197
The Meaning of LED Indicators	198
SnapServer NAS N2000 and EXP E2000 Status and Drive Light Behavior	198
SnapServer 110/210 Status and Drive Light Behavior	201
SnapServer 410 Status and Drive Light Behavior	202
SnapServer 500/600 Series Status and Drive Light Behavior	204
SnapServer 4200/4500 Status and Drive Light Behavior	207
SnapServer 18000 Status and Drive Light Behavior	209
Snap Expansion S50 Enclosure, Disk Drive, APC Module, and Controller Behavior	212
Snap Disk 10 Disk Drive and Power Supply Module LEDs	214
Snap Disk 30SA Disk Drive and Power/Fan Module Behavior	216
System Reset Options	219
Resetting the SnapServer to Factory Defaults	219
Performing System Resets Without Network Access	220
Networking Issues	221
Miscellaneous Issues	224
Phone Home Support	226
D - GuardianOS Ports	229
Glossary	233

Match case Limit results 1 per page

Volumes

SnapServer Administrator Guide

them). The security model determines the file-level security scheme that will apply

to files and folders within the volume or SnapTree directory.

Configuring Write Cache

Note

Not related to write cache on iSCSI disks. For information about configuring

write cache on iSCSI disks, see “Write-Cache Options with iSCSI Disks” on page 89.

By default, write cache is enabled on all volumes. For systems that do not use a UPS

device to help protect data during a power outage or for applications that require

synchronous writes to disk, write cache can be disabled on a volume by volume

basis. When a volume’s write cache is disabled, all data written to the volume

bypasses memory buffers and writes directly to disk, helping to protect the data

when writes are occur during a power outage. While disabling write cache does

help protect data, it also significantly impacts disk write performance. For the

procedures to disable write cache on new and existing volumes, see To Disable/

Enable Write Cache on a New Volume or To Disable/Enable Write Cache on an

Existing Volume.

Note

When write cache is disabled on a volume, disk cache is also disabled on all

disk drives that are members of the RAID or RAID group hosting the volume. This

can impact performance on other volumes with write cache enabled that are hosted

by the same RAID or RAID group.

Note

Not all disk drives support disabling write cache. If any of the volume’s

drives are IDE drives, you will not have the option to disable write cache for that

volume.

In addition, write cache can not be disabled on SnapServer 18000 or the

SD30 expansion unit.

Checking Filesystems

Filesystems on individual volumes can be checked for errors and repaired, if

necessary. The root volume can also be checked, and any errors found will

automatically be repaired. Since the GuardianOS automatically checks the root

volume for errors if any of a number of triggers occurs (e.g., a power outage, failure

of the volume to mount, etc.), it is recommended that the root filesystem check

feature only be used when directed by a Technical Support representative. See the

Volumes section in the Online Help for procedures to check the volume filesystems.