- What's New
-
Service Overview
- DSS Infographics
- What Is DSS?
- Region and AZ
- Storage Pool Types and Performance
- Storage Pool Capacity Description
- DSS Disks
- DSS Three-Copy Redundancy
- Device Types and Usage Instructions
- Shared Disks and Usage Instructions
- Disk Encryption
- Disk Backup
- DSS and Other Services
- Billing
- Permissions
- Constraints
- Change History
-
Getting Started
- Operation Procedure
- Step 1: Apply for a Storage Pool
- Step 2: Create a Disk
- Step 3: Attach a Disk
-
Step 4: Initialize a Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Data Disk in Windows (Windows Server 2008)
- Initializing a Data Disk in Windows (Windows Server 2016)
- Initializing a Data Disk in Linux (fdisk)
- Initializing a Data Disk in Linux (parted)
- Initializing a Data Disk Greater Than 2 TB in Windows (Windows Server 2008)
- Initializing a Data Disk Greater Than 2 TB in Windows (Windows Server 2012)
- Initializing a Data Disk Greater Than 2 TB in Linux (parted)
- Change History
-
User Guide
- Permissions Management
- Storage Pool Management
-
Disk Management
- Detaching a Disk
- Attaching an Existing Disk
- Deleting a Disk
-
Expanding the Capacity of a Disk
- Introduction to Expansion Scenarios
- Expanding an In-use Disk
- Expanding an Available Disk
- Extending Partitions and File Systems on Windows
- Extending Partitions and File Systems on Linux (fdisk)
- Extending Partitions and File Systems on Linux (parted)
- Extending Partitions and File Systems of a SCSI Data Disk on Linux (fdisk)
- Extending Partitions and File Systems of a System Disk on Linux (fdisk)
- Managing Encrypted Disks
- Managing Shared Disks
- Managing Backups
- Change History
- API Reference
-
FAQs
- What Are the Risks of Not Expanding the Storage Pool Capacity?
- How Many Statuses Does a Storage Pool Have?
- How Many Statuses Does a Disk Have?
- Troubleshooting and Impacts on the DSS Usage
- Can I Attach a Disk to Multiple Servers?
- Will Data in the DSS Disk Be Lost When the DSS Disk Is Detached?
- What Should I Do If an Error Occurs on My DSS Disk?
- How Can I Test DSS Disk Performance?
- What Are the Restrictions on Attaching a Disk to an ECS?
- What Are the Precautions for Detaching a Disk from an ECS?
- Why My Disk Cannot Be Attached to a Server?
- Can the Disk Space Usage Be Reduced If I Delete Files on a Server?
- Videos
- Glossary
-
More Documents
-
User Guide (Paris and Amsterdam Regions)
- Introduction
-
Quick Start
- Operation Procedure
- Step 1: Apply for a Storage Pool
- Step 2: Create a Disk
- Step 3: Attach a Disk
-
Initialize a Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Data Disk in Windows (Windows Server 2008)
- Initializing a Data Disk in Windows (Windows Server 2016)
- Initializing a Data Disk in Linux (fdisk)
- Initializing a Data Disk in Linux (parted)
- Initializing a Data Disk Greater Than 2 TB in Windows (Windows Server 2008)
- Initializing a Data Disk Greater Than 2 TB in Windows (Windows Server 2012)
- Initializing a Data Disk Greater Than 2 TB in Linux (parted)
- Obtaining the Domain Name
- Obtaining the Region
-
Management
- Storage Pool Management
-
Disk Management
- Detaching a Disk
- Deleting a Disk
-
Expanding the Capacity of a Disk
- Introduction to Expansion Scenarios
- Expanding an In-use Disk
- Expanding an Available Disk
- Performing Post-Expansion Operations for a Windows Disk
- Performing Post-Expansion Operations for a Disk in Linux (fdisk)
- Performing Post-Expansion Operations for a Disk in Linux (parted)
- Performing Post-Expansion Operations for a SCSI Data Disk in Linux (fdisk)
- Performing Post-Expansion Operations for a System Disk in Linux (fdisk)
- Managing an Encrypted Disk
- Managing a Shared Disk
- Managing a Backup
-
FAQs
- What Are the Risks of Not Expanding the Storage Pool Capacity?
- How Many Statuses Does a Storage Pool Have?
- How Many Statuses Does a Disk Have?
- Troubleshooting and Impacts on the DSS Usage
- Can I Attach a Disk to Multiple Servers?
- Will Data in the DSS Disk Be Lost When the DSS Disk Is Detached?
- What Should I Do If an Error Occurs on My DSS Disk?
- What Are the Restrictions on Attaching a Disk to an ECS?
- What Are the Precautions for Detaching a Disk from an ECS?
- Why My Disk Cannot Be Attached to a Server?
- Change History
-
User Guide (Paris and Amsterdam Regions)
- General Reference
Copied.
Device Types and Usage Instructions
What Device Types Are Available?
- VBD is the default EVS disk device type. VBD EVS disks support only basic read/write SCSI commands.
- SCSI EVS disks support transparent SCSI command transmission and allow the server OS to directly access the underlying storage media. Besides basic read/write SCSI commands, SCSI disks support advanced SCSI commands.
Common Application Scenarios and Usage Instructions of SCSI EVS Disks
- SCSI EVS disks: BMSs support only SCSI EVS disks.
- Shared SCSI EVS disks: Shared SCSI EVS disks must be used together with a distributed file system or cluster software. Because most cluster applications, such as Windows MSCS, Veritas VCS, and Veritas CFS, require the usage of SCSI reservations, you are advised to use shared EVS disks with SCSI.
SCSI reservations take effect only when shared SCSI EVS disks are attached to ECSs in the same ECS group. For more information about shared EVS disks, see Shared Disks and Usage Instructions.
Do I Need to Install a Driver for SCSI EVS Disks?
- BMS
Both the Windows and Linux images for BMSs are pre-installed with the required SDI card driver. Therefore, no driver needs to be installed.
- KVM ECS
You are advised to use SCSI EVS disks with KVM ECSs. Linux images and Windows images for KVM ECSs already have the required driver. Therefore, no driver needs to be installed for KVM ECSs.
NOTE:
ECS virtualization types are categorized into KVM and Xen. For details, see Product Introduction > ECS Types in the Elastic Cloud Server User Guide.
- Xen ECS
Due to driver limitations, you are advised not to use SCSI EVS disk with Xen ECSs.
However, a few images support SCSI EVS disks on Xen ECSs. For the supported images, see Table 1.NOTE:
After confirming that the OS images of Xen ECSs support SCSI EVS disks, determine whether you need to install the driver:
- Public Windows images are preinstalled with the Paravirtual SCSI (PVSCSI) driver. Therefore, no driver needs to be installed.
- Private Windows images are not preinstalled with the PVSCSI driver. You need to download and install it explicitly.
For details, see (Optional) Optimizing Windows Private Images in the Image Management Service User Guide.
- Linux images are not preinstalled with the PVSCSI driver. You need to obtain the source code of the open-source Linux driver at https://github.com/UVP-Tools/SAP-HANA-Tools.
Table 1 OSs supporting SCSI EVS disks Virtualization Type
OS
Xen
Windows
See the Windows images listed on the Public Images page.
Log in to the management console, choose Image Management Service, click the Public Images tab, and select ECS image and Windows from the drop-down lists, respectively.
Linux
- SUSE Linux Enterprise Server 11 SP4 64bit (The kernel version is 3.0.101-68-default or 3.0.101-80-default.)
- SUSE Linux Enterprise Server 12 64bit (The kernel version is 3.12.51-52.31-default.)
- SUSE Linux Enterprise Server 12 SP1 64bit (The kernel version is 3.12.67-60.64.24-default.)
- SUSE Linux Enterprise Server 12 SP2 64bit (The kernel version is 4.4.74-92.35.1-default.)
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