FAQ about Managed Service for OpenSearch

• How are OpenSearch clusters maintained?

• Is cluster backup enabled by default?

• Which OpenSearch version does Managed Service for OpenSearch use?

• What happens when a new OpenSearch version is released?

• How do I get the logs of my actions in the services?

• How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?

• Why is the cluster slow even though the computing resources are not used fully?

• Can I connect to cluster hosts via SSH or get superuser permissions on hosts?

General questionsGeneral questions

How are OpenSearch clusters maintained?How are OpenSearch clusters maintained?

In Managed Service for OpenSearch, maintenance implies:

• Automatic installation of OpenSearch updates and fixes for your database hosts.
• Changes to the host class and storage size.
• Other Managed Service for OpenSearch maintenance activities.

For more information, see Maintenance.

Is cluster backup enabled by default?Is cluster backup enabled by default?

Yes, automatic backup is enabled by default and takes place every hour. All backups are incremental and store only the data that has changed since the previous backup to save storage space.

Automatic backups are stored for two weeks.

Which OpenSearch version does Managed Service for OpenSearch use?Which OpenSearch version does Managed Service for OpenSearch use?

The OpenSearch versions maintained by the vendor are available in Managed Service for OpenSearch. For more information, see OpenSearch versioning policy.

What happens when a new OpenSearch version is released?What happens when a new OpenSearch version is released?

When a new minor version is released, the cluster software is automatically updated after testing. Clusters with an unsupported OpenSearch version will also be updated automatically.

The owner of the affected clusters will receive a notice of expected work times and database availability.

Can I get logs of my operations with services?Can I get logs of my operations with services?

Yes, you can request log records about your resources from Yandex Cloud services. For more information, see Data requests.

What is the retention period for logs?What is the retention period for logs?

Cluster logs are stored for 30 days.

How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?

Create an alert with the disk.used_bytes metric in Yandex Monitoring. This metric shows the disk space usage in the Managed Service for OpenSearch cluster.

For disk.used_bytes, use notification thresholds. The recommended values are as follows:

• Alarm: 90% of the disk space
• Warning: 80% of the disk space

Thresholds are set in bytes only. For example, the recommended values for a 100 GB disk are as follows:

• Alarm: 96,636,764,160 bytes (90%)
• Warning: 85,899,345,920 bytes (80%)

Why is the cluster slow even though the computing resources are not used fully?Why is the cluster slow even though the computing resources are not used fully?

Perhaps, the maximum storage IOPS and bandwidth values are insufficient for processing the current number of requests. In this case, throttling is triggered and the performance of the entire cluster degrades.

The maximum IOPS and bandwidth values increase by a fixed value when the storage size increases by a certain step. The step and increment values depend on the disk type:

Disk type	Step, GB	Max IOPS increase (read/write)	Max bandwidth increase (read/write), MB/s
network-hdd	256	300/300	30/30
network-ssd	32	1,000/1,000	15/15
network-ssd-nonreplicated	93	28,000/5,600	110/82

To increase the maximum IOPS and bandwidth values and make throttling less likely, increase the storage size or switch to a faster disk type by restoring the cluster from a backup.

Can I connect to cluster hosts via SSH or get superuser permissions on hosts?Can I connect to cluster hosts via SSH or get superuser permissions on hosts?

You cannot connect to hosts via SSH, nor can you get superuser permissions. This is done for the sake of security and user cluster fault tolerance because direct changes inside a host can render it completely inoperable.