Tag Archive for 'raid'


Drive Roaming. DELL PERC4 Controllers

During a recent test run to see if a new PostgreSQL back end server would hasten things up in a main cluster – that has now become CPU bound and NOT IO…… the wizardry of that I will blog about later. In any case, the short of it is, that we were juggling PERC4 cards […]


When 73GB is not 73GB! Enter LVM

Thought I should write something tech for a change! 😉 It is golden week here and all are away on break. So instead of forcing a staff member to come back, I thought I would take care of some stuff myself. My problems started when a client who has a large advertising cluster, was running […]


PostgreSQL Upgrade Part 3

I knew the config files were different between 7.4 and 8.1 and that some items merely changed names and some were deprecated. I used this excellent resource before. Even the very rudimentary tweaks I did, and with a RAID array that is in a 90% rebuild rate, background initialisation, this 8.1 version is FAST! I […]


PostgreSQL Upgrade Part 2

Well, the PostgreSQL upgrade was a snap, sorta. I needed to do a full dump and restore as this was a major version change – no surprises there. What pissed me off though, is that when using the binary data type for dump files when using pg_dump (“-T c”) the resulting backup file is of […]


PostgreSQL Upgrade

Well this week was fun. For some reason one of our main clusters that runs client ASP software for general office, file, email, collaboration, etc… went crazy. First I noticed that the usual night time “Vacuum’s” that are needed to keep the PostgreSQL planar at it’s most efficient and indexes clean, was running right into […]


RAID Risks. Actuary for data?

Good read on the numbers behind your storage risk planning. http://storageadvisors.adaptec.com/2007/07/10/effect-of-drive-count-on-raid-5/ Personally, when the data at stake is your clients and by inference your company’s reputation and business longevity, nothing short of a 1 in your RAID setup will do. So RAID1 or RAID10. Currently I split data for PostgreSQL on to RAID10 volumes for […]


Computing on Demand

I was just talking to a client and I had to explain to him that, “You already have the RAID card in your motherboard, but you can’t use it until you buy an activation key from Dell”. This confused him. “If I have it, why do I have to pay for it?”. Well without getting […]