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Ensuring High Availability with your StorSimple Appliance

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Part no. - 760-0007-0001-D

Document attachment - Ensuring high availability with your appliance

The hardware platform that is included with the StorSimple solution has enterprise-grade availability and reliability features that provide a foundation for a highly-available, fault-tolerant storage infrastructure in your data center.  This document outlines items that must be considered to ensure high availability. 

Failure to follow the requirements and procedures in this document could lead to disruption of service or loss of data.

 

Component Requirements and Procedures
Power and Cooling Modules (PCMs) Appliances include redundant, hot-swappable PCMs.  Each PCM has enough capacity to provide service for the entire chassis.  Both PCMs must be installed to ensure high availability.

• Connect PCMs to different power sources to provide availability should a power source fail
• Should a PCM fail, request a replacement immediately
• Remove a failed PCM only when you have the replacement and are ready to replace it 
• Do not remove both PCMs concurrently

Controller Modules Appliances include redundant, hot-swappable controller modules.  StorSimple controller modules operate in an active/passive manner.  At any given time, one controller module is ‘active’ and providing service, whereas the other controller module is ‘standby'.  The ‘standby' controller module is powered on and becomes operational in the event of a failure or removal of the ‘active’ controller module.  Each controller module has enough capacity to provide service for the entire chassis.  Both controller modules must be installed to ensure high availability.

• Ensure both controller modules are installed at all times
• Should a controller module fail, request a replacement immediately
• Remove a failed controller module only when you have the replacement and are ready to replace it
• Ensure that the network connections to both controller modules are identical, and the connected network interfaces have an identical network configuration
• Should a controller module fail or need replacement, ensure that the other controller module is in an ‘active’ state prior to replacing the failed controller module
• Do not remove both controller modules concurrently
• Should a controller failover be in progress, do not shutdown the passive controller module or remove it from the chassis

• After a controller failover, wait at least five minutes before removing either controller module

Network Interfaces Appliance controller modules each have four Gigabit Ethernet network interfaces.  Three of these interfaces are labeled ‘DATA’ (for iSCSI and cloud access), and one interface is labeled ‘MGMT’ (for management).

• Ensure that the network connections to both controller modules are identical, and the network interfaces the controller module interfaces are connected to have an identical network configuration
• Deploy network connections across different switches when possible to ensure service availability in the event of a network device failure
• Connect at least two DATA interfaces to the network from each controller module
• Use MPIO on servers when possible to ensure servers can tolerate a link, network, or interface failure

SSDs and HDDs Appliances include solid state disks (SSDs) and hard disk drives (HDDs) that are RAID-protected using RAID-10, and a hot-spare is provided for the HDDs. Use of RAID-10 ensures that the appliance is able to tolerate the failure of one or more SSDs and HDDs.

• Ensure that all SSD and HDD modules are installed
• Should an SSD or HDD fail, request a replacement immediately
• Should an SSD or HDD fail or require replacement, ensure that you only remove the SSD or HDD that requires replacement
• Do not remove more than one SSD or HDD from the system at any point in time
• During replacement, monitor the Hardware page in Web UI to get the status of SSDs and HDDs. A green status indicates that the disks are healthy, a yellow indicates they are recovering whereas red refers to a failed SSD or HDD.

EBOD Enclosure

Appliance model 7520 includes an EBOD Enclosure in addition to the head unit. These EBOD consists of EBOD enclosure controller modules and hard disk drives (HDDs) that are RAID-protected using RAID-10, and include a hot-spare for the HDDs. Use of RAID-10 ensures that the appliance is able to tolerate the failure of one or more HDDs. The EBOD enclosure is connected to the appliance unit through two redundant SAS cables.

  • Ensure that both EBOD enclosure controller modules, both SAS cables and all the hard disk drives are installed at all times
  • Should an EBOD enclosure controller module or a HDD fail, request a replacement immediately
  • Should an EBOD enclosure controller module fail, ensure that the other controller module is in 'active' state prior to its replacement
  • Should a HDD fail or require replacement, ensure that you only remove the HDD that requires replacement
  • Do not remove more than one HDD from the system at any point in time
  • During EBOD controller module or a HDD replacement, continuously monitor the status of the relevant component in the Web UI by accessing Manage Hardware
  • Should a SAS cable fail or require replacement (StorSimple support should be involved to make such a determination), ensure that you only remove the SAS cable that requires replacement
  • Do not remove both SAS cables concurrently from the system at any point in time

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