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Rubie Mccloughan
The myisamchk utility gets information about your database tables or checks, repairs, or optimizes them. myisamchk works with MyISAM tables (tables that have .MYD and .MYI files for storing data and indexes).
It is best to make a backup of a table before performing a table repair operation; under some circumstances the operation might cause data loss. Possible causes include but are not limited to file system errors.
With no options, myisamchk simply checks your table as the default operation. To get more information or to tell myisamchk to take corrective action, specify options as described in the following discussion.
tbl_name is the database table you want to check or repair. If you run myisamchk somewhere other than in the database directory, you must specify the path to the database directory, because myisamchk has no idea where the database is located. In fact, myisamchk does not actually care whether the files you are working on are located in a database directory. You can copy the files that correspond to a database table into some other location and perform recovery operations on them there.
You can name several tables on the myisamchk command line if you wish. You can also specify a table by naming its index file (the file with the .MYI suffix). This enables you to specify all tables in a directory by using the pattern *.MYI. For example, if you are in a database directory, you can check all the MyISAM tables in that directory like this:
You must ensure that no other program is using the tables while you are running myisamchk. The most effective means of doing so is to shut down the MySQL server while running myisamchk, or to lock all tables that myisamchk is being used on.
This means that you are trying to check a table that has been updated by another program (such as the mysqld server) that hasn't yet closed the file or that has died without closing the file properly, which can sometimes lead to the corruption of one or more MyISAM tables.
If mysqld is running, you must force it to flush any table modifications that are still buffered in memory by using FLUSH TABLES. You should then ensure that no one is using the tables while you are running myisamchk
Planning an upgrade? You can instantly generate a tailored upgrade plan from within Confluence. Head to Administration > General Configuration > Plan your upgrade
Database character encoding must be set to UTF8 (or UTF8MB4 for MySQL databases, or AL32UTF8 for Oracle databases). You will not be able to upgrade to the current Confluence versions unless you have the correct character encoding.
Once you've confirmed your database backup was successful, you can choose to disable the automatic generation of an upgrade recovery file, as this process can take a long time for sites that are medium sized or larger.
Back up your home directory.
The installation wizard gives you the option to also back up your home directory as part of the installation process, but you should also back up this directory manually before starting the upgrade.
If prompted to allow the upgrade wizard to make changes to your computer, choose 'Yes'. If you do not, the installation wizard will have restricted access to your operating system and any subsequent installation options will be limited.
Any other configurations, customizations (including any other modifications in the /conf/server.xml file), the path to your own Java installation in /bin/setjre.sh, or setjre.bat, or additional files added to the installation directory are not migrated during the upgrade and need to be reapplied manually.
We strongly recommend you test your customizations in a test instance prior to upgrading your production instance as changes may have been made to Confluence that make your customizations unusable.
If you need to retry the upgrade, you must restore your pre-upgrade backups first. Do not attempt to run an upgrade again, or start the older version of Confluence again after an upgrade has failed.
Space directory is empty after the upgrade
If you are upgrading from Confluence 6.3 or earlier, there's a known issue where spaces do not appear in the space directory. You'll need to reindex your site after upgrading to fix this.
There is a finite set of possible health alerts that a Red Hat Ceph Storage cluster can raise that show in the OpenShift Data Foundation user interface. These are defined as health alerts which have unique identifiers. The identifier is a terse pseudo-human-readable string that is intended to enable tools to make sense of health checks, and present them in a way that reflects their meaning. Click the health alert for more information and troubleshooting.
Ceph manager is missing replicas. Thispts health status reporting and will cause some of the information reported by the ceph status command to be missing or stale. In addition, the Ceph manager is responsible for a manager framework aimed at expanding the existing capabilities of Ceph.
Storage cluster utilization has crossed 80% and will become read-only at 85%. Your Ceph cluster will become read-only once utilization crosses 85%. Free up some space or expand the storage cluster immediately. It is common to see alerts related to Object Storage Device (OSD) full or near full prior to this alert.
This alert reflects that the storage cluster is in ERROR state for an unacceptable amount of time and thispts the storage availability. Check for other alerts that would have triggered prior to this one and troubleshoot those alerts first.
This alert reflects that the storage cluster has been in a warning state for an unacceptable amount of time. While the storage operations will continue to function in this state, it is recommended to fix the errors so that the cluster does not get into an error state. Check for other alerts that might have triggered prior to this one and troubleshoot those alerts first.
When the storage metadata service (MDS) cannot keep its cache usage under the target threshold specified by mds_health_cache_threshold, or 150% of the cache limit set by mds_cache_memory_limit, the MDS sends a health alert to the monitors indicating the cache is too large. As a result, the MDS related operations become slow.
The MDS tries to stay under a reservation of the mds_cache_memory_limit by trimming unused metadata in its cache and recalling cached items in the client caches. It is possible for the MDS to exceed this limit due to slow recall from clients as a result of multiple clients accesing the files.
Make sure you have enough memory provisioned for MDS cache. Memory resources for the MDS pods need to be updated in the ocs-storageCluster in order to increase the mds_cache_memory_limit. Run the following command to set the memory of MDS pods, for example, 16GB:
OpenShift Data Foundation automatically sets mds_cache_memory_limit to half of the MDS pod memory limit. If the memory is set to 8GB using the previous command, then the operator sets the MDS cache memory limit to 4GB.
The storage metadata service (MDS) serves filesystem metadata. The MDS is crucial for any file creation, rename, deletion, and update operations. MDS by default is allocated two or three CPUs. This does not cause issues as long as there are not too many metadata operations. When the metadata operation load increases enough to trigger this alert, it means the default CPU allocation is unable to cope with load. You need to increase the CPU allocation.
Click Workloads Pods. Select the corresponding MDS pod and click on the Metrics tab. There you will see the allocated and used CPU. By default, the alert is fired if the used CPU is 67% of allocated CPU for 6 hours. If this is the case, follow the steps in the mitigation section.
Minimum required replicas for the storage metadata service (MDS) are not available. MDS is responsible for filing metadata. Degradation of the MDS service can affect how the storage cluster works (related to the CephFS storage class) and should be fixed as soon as possible.
In a Ceph cluster there is a redundant set of monitor pods that store critical information about the storage cluster. Monitor pods synchronize periodically to obtain information about the storage cluster. The first monitor pod to get the most updated information becomes the leader, and the other monitor pods will start their synchronization process after asking the leader. A problem in network connection or another kind of problem in one or more monitor pods produces an unusual change of the leader. This situation can negatively affect the storage cluster performance.
Multiple MONs work together to provide redundancy. Each of the MONs keeps a copy of the metadata. The cluster is deployed with 3 MONs, and requires 2 or more MONs to be up and running for quorum and for the storage operations to run. If quorum is lost, access to data is at risk.
Restore the Ceph MON Quorum. For more information, see Restoring ceph-monitor quorum in OpenShift Data Foundation in the Troubleshooting guide. If the restoration of the Ceph MON Quorum fails, follow the general pod troubleshooting to resolve the issue.
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