Save asynchronous mirror group statistics

09/10/2024 Contributors

The save storageArray arvmStats asyncMirrorGroup command saves the synchronization statistics to a file for one or more member volumes in an asynchronous mirror group.

Supported Arrays

This command applies to any individual storage array, including the E4000, E2700, E5600, E2800, E5700, EF600, and EF300 arrays, as long as all SMcli packages are installed.

Roles

To execute this command on an E4000, E2800, E5700, EF600, or EF300 storage array, you must have the Storage Admin role.

Context

The statistics collected are available only for asynchronous mirror group member volumes in a primary role on the local storage array.

A set of data is collected during the synchronization process that can be used to evaluate how well the mirror configuration is functioning. The data is collected as a set of samples. A sample is created at the beginning of a synchronization process and updated regularly while the synchronization process proceeds.

A sample collects data until the synchronization process completes or until a disruption to the synchronization process occurs, such as a volume ownership transfer or a read-write error. When a synchronization process disruption is resolved (for example, the volume is transferred to the alternate controller), a new sample is created and updated as the synchronization process continues.

Syntax

save storageArray arvmStats asyncMirrorGroup [asyncMirrorGroupName]
arvmStats file="filename"
"
[volume="volumeName"]
[sampleType=(all | mostRecent | longestSyncTime | errors)]
[recordLimit=(1-90)]

Parameters

Parameter Description

Parameter	Description
`asyncMirrorGroup`	The name of the asynchronous mirror group for which you are saving synchronization statistics. Enclose the asynchronous mirror group name in square brackets ([ ]). If the asynchronous mirror group name has special characters or numbers, you must enclose the asynchronous mirror group name in double quotation marks (" ") inside square brackets.
`file`	The file path and the file name to which you want to save the synchronization statistics. Enclose the file name in double quotation marks (" "). For example: `file="C:\Program Files\CLI\logs\asynchdata.csv"` This command does not automatically append a file extension to the saved file. You can use any file name, but you must use the `.csv` extension.
`volume`	This parameter is optional. The name of the specific member volume in the asynchronous mirror group for which you are retrieving synchronization statistics. If no volume is specified, the statistics for every member volume in the asynchronous mirror group are saved. If statistics are collected for more than one volume in an asynchronous mirror group, all the data will be written to the same file. Enclose the volume name in double quotation marks (" ").
`sampleType`	This parameter is optional. The default value for `sampleType` is `all`. `all` — Data for all three sample types are collected and written to the same file. `mostRecent` — Statistics are recorded for the most recent 50 resynchronization samples. `longestSyncTime` — Statistics are collected for the most recent 20 longest resynchronization samples. `errors` — Statistics are recorded for the most recent 20 failed resynchronization samples. These samples include a failure code.
`recordLimit`	This parameter is optional. The default value for record limit is `no limit`. The `recordLimit` must be greater than 0 and less than or equal to 90.

asyncMirrorGroup

The name of the asynchronous mirror group for which you are saving synchronization statistics. Enclose the asynchronous mirror group name in square brackets ([ ]). If the asynchronous mirror group name has special characters or numbers, you must enclose the asynchronous mirror group name in double quotation marks (" ") inside square brackets.

file

The file path and the file name to which you want to save the synchronization statistics. Enclose the file name in double quotation marks (" "). For example:

file="C:\Program Files\CLI\logs\asynchdata.csv"

This command does not automatically append a file extension to the saved file. You can use any file name, but you must use the .csv extension.

volume

This parameter is optional. The name of the specific member volume in the asynchronous mirror group for which you are retrieving synchronization statistics. If no volume is specified, the statistics for every member volume in the asynchronous mirror group are saved.

If statistics are collected for more than one volume in an asynchronous mirror group, all the data will be written to the same file.

Enclose the volume name in double quotation marks (" ").

sampleType

This parameter is optional. The default value for sampleType is all.

all — Data for all three sample types are collected and written to the same file.
mostRecent — Statistics are recorded for the most recent 50 resynchronization samples.
longestSyncTime — Statistics are collected for the most recent 20 longest resynchronization samples.
errors — Statistics are recorded for the most recent 20 failed resynchronization samples. These samples include a failure code.

recordLimit

This parameter is optional. The default value for record limit is no limit. The recordLimit must be greater than 0 and less than or equal to 90.

Notes

Statistics are captured for mirrored volumes in the Primary role. The statistics collected include the following data:

Synchronization start time
Synchronization type (manual or periodic)
Synchronization duration
Number of bytes sent
Maximum write time (for a single write)
Minimum write time (for a single write)
Minimum synchronization data rate
Maximum synchronization data rate
Total write time
Repository utilization (%)
Recovery point age

During initial synchronization, statistics samples are captured approximately every 15 minutes.

The synchronization statistics are included in the support bundle.

Minimum firmware level

7.84

11.80 adds EF600 and EF300 array support