Capacity and failure tolerance charts

View charts that show the capacity information for object storage systems, the number and consolidated status of the COS Accesser and COS Slicestor nodes at each location, the access risk for COS Vaults, and the storage risk for COS Vaults and COS Slicestor nodes.

Object Capacity

The Object Capacity chart shows information about the available and used file system capacity for the object storage system. This chart is shown only for IBM Storage Scale System.

The following information is shown:
Available Capacity
The file system capacity that is available for object data.
Used Capacity
The amount of file system capacity that is used by the objects in the storage system.
Tip: The chart shows information only for the accounts that the user that is used to monitor the object storage system has admin access to. To view the amount of capacity that is used by all accounts in the object storage system, the user must also be assigned the ResellerAdmin role.

Sites

This chart shows information about the capacity and geographical distribution of COS Slicestor and COS Accesser nodes in an object storage system. This chart is shown only for IBM Cloud Object Storage.

For each site, the following information is shown:
  • A capacity bar that shows the used capacity and available capacity for the site.

    Hover over the bar to view the total capacity, used capacity, and available capacity on all of the COS Slicestor nodes at the site. The values include capacity that is reserved for overheads, such as formatting, disk overhead, and dispersal overhead.

  • The number and consolidated status of the COS Accesser and the COS Slicestor nodes at the site. For example, if a site has 16 COS Slicestor nodes and one of the COS Slicestor nodes has an Error status, a consolidated status of Error is shown for the COS Slicestor nodes at the site.

Capacity by IDA

This chart shows the total used capacity of all the COS Vaults that are configured with each Information Dispersal Algorithm. The five IDAs that consume the most storage space are shown and each IDA is represented by a bar on the chart.

The used capacity values do not include capacity that is reserved for overheads, such as formatting, disk overhead, and dispersal overhead. This chart is shown only for IBM Cloud Object Storage.
Tip: In the manager applications for IBM Cloud Object Storage, storage capacity is represented in decimal (base 10) units, such as kilobyte (KB), megabyte (MB), and gigabyte (GB). In IBM Storage Insights Pro, storage capacity is represented in binary (base 2) units such as kibibyte (KiB), mebibyte (MiB), and gibibyte (GiB). For more information, see Units of measurement for storage data.

Vaults by Accessers

This chart shows the vaults that are currently inaccessible from their access pools and the tolerance of the remaining vaults to COS Accesser node failures.
Tip: Only COS Accesser nodes that are configured as dedicated access servers for IBM Cloud Object Storage are shown on the chart.
Vaults might be inaccessible for the following reasons:
  • All the COS Accesser nodes that are configured for the vault are in a failed state. An error icon Error condition icon is shown on the chart if the number of inaccessible vaults > 0.
  • The vault is not deployed to an access pool. An error icon is not shown in this scenario because this configuration is valid.
Use the chart to determine how many COS Accesser node failures that your vaults can tolerate before the vaults lose read and write access. For example, the chart might show the following values on separate lines:
  • 1 Failure 10 Vaults at Risk
  • 2 Failures 26 Vaults at Risk
These values represent the different tolerance levels of the vaults to COS Accesser node failures. The first line indicates that 10 vaults each depend on a single COS Accesser node for access. If the remaining node fails, that vault will be inaccessible. An additional 26 vaults will be inaccessible if 2 nodes fail.
The chart uses different colors to represent the different levels of tolerance to COS Accesser node failures:
Color Description
Dark orange bar Vaults will be inaccessible if 1 COS Accesser node fails.
Light orange bar Vaults will be inaccessible if 2 COS Accesser nodes fail.
Yellow bar Vaults will be inaccessible if 3 COS Accesser nodes fail.
Green bar Vaults have a high tolerance because at least 4 COS Accesser nodes are available.

Vaults by Drives

This chart shows the vaults that are currently unavailable for write operations and the tolerance of the remaining vaults if more drives fail in the available COS Slicestor nodes. The chart is shown only for IBM Cloud Object Storage with firmware version 3.10.0.117 or later on the manager node.

Use the chart to determine how many drive failures that your vaults can tolerate before the vaults will be unavailable for write operations. For example, the chart might show the following values on separate lines:
  • 1 Failure 3 Vaults at Risk
  • 2 Failures 17 Vaults at Risk

These values represent the different tolerance levels of the vaults to drive failures across all of the available COS Slicestor nodes in the storage pool that the vault belongs to. The first line indicates that for each of the 3 vaults, 1 drive failure in the available nodes will cause that vault to be unavailable for write operations. An additional 17 vaults will be unavailable for write operations if 2 drives fail. Learn more about how failure tolerance is calculated for vaults.

The chart uses different colors to represent the different levels of tolerance to drive failures:
Color Description
Dark orange bar Vaults will be unavailable for write operations if 1 drive fails.
Light orange bar Vaults will be unavailable for write operations if 2 drives fail.
Yellow bar Vaults will be unavailable for write operations if 3 drives fail.
Green bar Vaults have a high tolerance because at least 4 drives are available.

Slicestors by Drives

This chart shows the COS Slicestor nodes that are currently unavailable due to drive failures and the tolerance of the remaining nodes if more of their drives fail. The chart is shown only for IBM Cloud Object Storage with firmware version 3.10.0.117 or later on the manager node.

A COS Slicestor node is unavailable to store vault data when the number of failed drives on the node ≥ the drive error threshold. You can view the drive error thresholds for your COS Slicestor nodes on the Slicestor Nodes page.

Use the chart to determine how many internal drive failures that your COS Slicestor nodes can tolerate before the nodes will be unavailable. For example, the chart might show the following values on separate lines:
  • 1 Failure 4 Slicestors at Risk
  • 2 Failures 8 Slicestors at Risk
These values represent the different tolerance levels of the COS Slicestor nodes to internal drive failures. The first line indicates that for four COS Slicestor nodes, if one of their internal drives fail, that node will be unavailable. For an additional eight nodes, if two of their internal drives fail, that node will be unavailable.
The chart uses different colors to represent the different tolerance levels of the COS Slicestor nodes to internal drive failures:
Color Description
Dark orange bar COS Slicestor nodes will be unavailable if one drive fails.
Light orange bar COS Slicestor nodes will be unavailable if two drives fail.
Yellow bar COS Slicestor nodes will be unavailable if three drives fail.
Green bar Nodes have a high tolerance to drive failures. At least four internal drives must fail before the nodes cannot store vault data.