Last week we migrated several Oracle databases to a new DBaaS platform. The company I’m working for is in the midst of a datacenter migration to a new cloud provider. Since the Oracle databases were located on old and very expensive Oracle machines, we looked for opportunities to optimize and reduce costs. After much debate, we decided to move all databases to a shared Oracle Exadata platform. Much faster, and much cheaper: the hardware is more expensive, but you win it back with lower licensing costs (less sockets used).
All the Oracle database migrations went pretty well: stop app, export database, transfer to new DC, import & start database. The app teams updated their connection strings and tested the apps. Pretty painless! However there were also some scripts working alongside the databases, mainly for data loads. Server names changed and some scripts had to be moved from the old database servers to the application servers.
Continue reading “Users don’t care if an application is supported, as long as it works”
According to Tintri, the rise of server virtualization broke the traditional storage system. Initially we had relatively simple environments where one server talks to a number of LUNs on a storage system. Sometimes we’d have a small cluster of servers accessing those volumes. Still relatively simple.
Fast forward to now: large clusters of hypervisor hosts are the norm, collectively accessing an even larger number of volumes. Each hypervisor in turn hosts a large number or virtual machines. In case of performance problems, how are you ever going to figure out the root cause and which other systems are affected?
Continue reading “Making life a whole lot easier with Tintri VM-aware storage”
I had the opportunity to play with a new EMC product last week: ScaleIO. It’s definitely not a new EMC product (I troubleshooted the 1.31 version and EMC released 2.0 at EMC World 2016) but I just hadn’t had the honor to work with one of those systems yet. ScaleIO is a software-defined storage solution that uses the local disks in your commodity server and shares these out as block LUNs across the Ethernet. Which means this architecture can scale pretty well, both on capacity and performance, using hundreds (if not thousands) of servers and disks.
Continue reading “ScaleIO Architecture and failure units”
When deleting an Isilon folder, you might come across some peculiar behavior. When browsing with a file explorer to an SMB share and deleting a folder, the operation apparently succeeds and the folder disappears. When refreshing the share however, the folder is back. Resorting to an SSH session to delete the folder, you get an Operation not permitted error and the rm/rmdir command fails.
Continue reading “Deleting an Isilon folder – Operation not permitted”