diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/consistency.txt | 2 | ||||
| -rw-r--r-- | docs/databases.txt | 8 | ||||
| -rw-r--r-- | docs/kickstart.txt | 1 | ||||
| -rw-r--r-- | docs/troubleshooting.txt | 11 |
4 files changed, 22 insertions, 0 deletions
diff --git a/docs/consistency.txt b/docs/consistency.txt index c648a9a..090f0a3 100644 --- a/docs/consistency.txt +++ b/docs/consistency.txt @@ -19,6 +19,8 @@ Storage ./gluster.sh info all_heketi - Check available storage space on system partition and LVM volumes (docker, heketi, ands) Run 'df -h' and 'lvdisplay' on each node + - Check status of hardware raids + /opt/MegaRAID/storcli/storcli64 /c0/v0 show all Networking ========== diff --git a/docs/databases.txt b/docs/databases.txt index 7f8468e..aa58a2e 100644 --- a/docs/databases.txt +++ b/docs/databases.txt @@ -9,8 +9,16 @@ Galera INNODB 3.5 MB/s fast 3 x 200% - Should be perfect, but I am not sure about automatic recovery... Galera/Hostnet INNODB 4.6 MB/s fast 3 x 200% - MySQL Slaves INNODB 5-6 MB/s fast 2 x 250% - Available data is HA, but caching is not. We can easily turn the slave to master. + MySQL S.+Zlib INNODB + ZLib 2-4 MB/s normal 2 x 300% - At about 35% compression level. DRBD MyISAM (no logs) 4-6 exp. ? I expect it as an faster option, but does not fit the OpenShift concept that well. + +Optimized (Large buffers, transactions in ADEI, etc.) + Method Database Perf (Mst/Slv) Clnt/Cache MySQL Gluster HA + MySQL Slaves INNODB 12 / 14 MB/s fast 600-800% - + + + Gluster is a way too slow for anything. If node crashes, MyISAM tables may be left in corrupted state. The recovery will take ages to complete. The Gluster/Block is faster, but HA suffers. The volume is attached to the pod running on crashed node. It seems not detached automatically until diff --git a/docs/kickstart.txt b/docs/kickstart.txt index fb2b5da..1331542 100644 --- a/docs/kickstart.txt +++ b/docs/kickstart.txt @@ -8,6 +8,7 @@ Troubleshooting vgdestroy <vgname> * Destroy rogue device mapper devices dmsetup info -C + dmsetup remove_all dmsetup remove <name>
\ No newline at end of file diff --git a/docs/troubleshooting.txt b/docs/troubleshooting.txt index ef3c206..ae43c52 100644 --- a/docs/troubleshooting.txt +++ b/docs/troubleshooting.txt @@ -244,6 +244,17 @@ Storage or again we can compare lvm volumes which are used by Gluster bricks and which are not. The later ones should be cleaned up. Again there is the script. +MySQL +===== + - MySQL may stop replicating from the master. There is some kind of deadlock in multi-threaded SLAVE SQL. + This can be seen by exexuting (which should show a lot of slave threads waiting on coordinator to provide + load). + SHOW PROCESSLIST; + The remedy is to restart slave MySQL with 'slave_parallel_workers=0', give it a time to go, and then + restart back in the standard multithreading mode. + + + Performance =========== - To find if OpenShift restricts the usage of system resources, we can 'rsh' to container and check |