Start a Percona 5.7 cluster after a controlled shutdown

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In each node check the content of /var/lib/mysql/grastate.dat version: 2.1 uuid: 9a50c4ec-4332-11e8-8b88-77564bb9f22a seqno: 45 safe_to_bootstrap: 0 select the node with the highest value in seqno and edit the value of safe_to_bootstrap to 1 should be like these version: 2.1 uuid: 9a50c4ec-4332-11e8-8b88-77564bb9f22a seqno: 45 safe_to_bootstrap: 1 in these node run systemctl start mysql@bootstrap.service in the other […]


Unresponsive NFS server

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At Calidade Systems we check our customer daily backup report. Today we detect the lack of one report. We connect to our customer Linux server and saw a unusual high CPU load but no processor usage, if we don’t have cpu usage the cause should be storage, we are sending backups to a NFS server, […]


A RAM slot does not work

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increase Memory and replace CPU is a fast way to improve performance in a workstation, recently during a workstation upgrade we found a strange behavior in the motherboard   The cause of this strange behavior is that motherboard socket has bent pins


Proxmox job failed with err -5 – Input/output error

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Proxmox is a good solution for single servers infrastructure, you can use a single server where you can house all customer virtual machines. Recently one customer  talked us about small problems with a legacy software, He has problems storing data, we make a check and index rebuilt in his database and everything start to work […]