Specifications and default values of the MVG tuning parameters
The MVG includes a set of configurable tuning parameters that control load balancing, client-policy assignments, cache behavior, and garbage collection. These parameters are typically adjusted for advanced optimization and troubleshooting. Below are the key parameters along with their default values and descriptions.
Table:
Parameter | Default value | Description |
|---|---|---|
mvg_lb_level | Gold | MVG load balance level that is used for disk volume selection. |
asmt_rb_freezing_timeout | 1800 | Time (in seconds) before reassigning a client+policy from an inactive node. |
asmt_rb_freezing_on_disk_full | false | When the value set to true, a client and policy combination is not assigned to another node if the current node is full. |
asmt_space_imbalance_threshold | 15 | If a node was initially selected based on an LB level criteria but its space usage exceeds the percentage threshold compared to another node, the other node is selected instead. It is applicable only when the MVG server selects a new node for client+policy. |
asmt_scatter_warning | 4 | The maximum number of nodes a client+policy can be scattered across (excludes MSDPLB+). |
asmt_agedout | 604800 (7 days) | Maximum duration (in seconds) an assignment can be cached if not on any node. |
asmt_max_threshold | 3000 | Threshold to trigger assignment cleanup. |
db_pool_max_size | 128 | Maximum number of icache DBs in memory pool. |
db_obj_timeout | 300 (5 minutes) | Time to consider a DB object as recently accessed. |
db_agedout | 15552000 (180 days) | Maximum age (in seconds) for caching a backup ID in icache DB. |
db_prealloc_size | 524255 (512 KB) | Preallocated size of icache SQLite DB file. |
db_max_size | 1048576 (1MB) | Maximum size of icache DB file. |
db_short_lifespan | 604800 (7 days) | Lifespan threshold for DB records with short remaining life. |
gc_interval | 604800 (7 days) | Interval for the next round of background GC operation. |
gc_start_time | 02:20:00 AM | Start time for daily GC operation. |
gc_duration | 10800 (3 hours) | Maximum duration for GC operation per day. |