# Failure of the primary region and healty status

**URL:** <https://forums.foundationdb.org/t/failure-of-the-primary-region-and-healty-status/5195>\
**Category:** Using FoundationDB\
**Created:** [February 2, 2026, 1:51pm UTC](https://forums.foundationdb.org/t/failure-of-the-primary-region-and-healty-status/5195 "2026-02-02T13:51:17Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![fuCtor](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/fuctor/32/1599_2.png) [@fuCtor](https://forums.foundationdb.org/u/fuCtor)\
**Post date:** [February 2, 2026, 1:51pm UTC](https://forums.foundationdb.org/t/failure-of-the-primary-region-and-healty-status/5195/1 "2026-02-02T13:51:17Z")

</div>

I’m testing the operation of a single region failure.  
When I lose the remote region, everything goes well, and the cluster status is healthy.  
When I lose the primary region, a warning about log loss appears, and the status doesn’t change to healthy.

```auto
Fault Tolerance - -1 machines
  Warning: the database may have data loss and availability loss. Please restart following tlog interfaces, otherwise storage servers may never be able to catch up.
  Old log epoch: 42 begin: 2670913795 end: 2805565521, missing log interfaces(id,address): 692fbc1fbe13f8e0, 6ec490bf0d3ba25e,

Data:
  Replication health - (Re)initializing automatic data distribution
  Moving data - unknown (initializing)
  Sum of key-value sizes - unknown
  Disk space used - 420 MB

```

Config:

```auto
{
    "regions": [
        {
            "satellite_redundancy_mode": "one_satellite_double",
            "satellite_logs": 2,
            "datacenters": [
                {
                    "id": "dc1",
                    "priority": 2,
                    "satellite": 0
                },
                {
                    "id": "dc4",
                    "priority": 1,
                    "satellite": 1
                },
                {
                    "id": "dc2",
                    "priority": 0,
                    "satellite": 1
                }                
            ]
        },
        {
            "satellite_redundancy_mode": "one_satellite_double",
            "satellite_logs": 2,
            "datacenters": [
                {
                    "id": "dc3",
                    "priority": 1,
                    "satellite": 0
                },
                {
                    "id": "dc2",
                    "priority": 1,
                    "satellite": 1
                },
                {
                    "id": "dc4",
                    "priority": 0,
                    "satellite": 1
                }
            ]
        }
    ]
}

```

Shutdown DC1,DC2.

Same messages for another topology:

```auto
{
    "regions": [
        {
            "satellite_redundancy_mode": "one_satellite_single",
            "satellite_logs": 2,
            "datacenters": [
                {
                    "id": "dc1",
                    "priority": 2,
                    "satellite": 0
                },
                {
                    "id": "dc5",
                    "priority": 1,
                    "satellite": 1
                }
            ]
        },
        {
            "satellite_redundancy_mode": "one_satellite_single",
            "satellite_logs": 2,
            "datacenters": [
                {
                    "id": "dc3",
                    "priority": 1,
                    "satellite": 0
                },
                {
                    "id": "dc5",
                    "priority": 1,
                    "satellite": 1
                }
            ]
        }
    ]
}

```

Shutdown DC1.