Musings on IT, data management, whitewater rafting, and backpacking

Wednesday, October 27, 2010

Thin clients on a separate network?

Should we give everyone a thin client on a separate network for accessing sensitive applications?


Tuesday, October 26, 2010

Massive Disk Failure Deja Vu, Part 2

So far, no further problems with this system.

Some corrections to the events reported in Massive Disk Failure Deja Vu, and followups on what we can or can't do to recover faster.

Monday, October 25, 2010

A different angle on RTO, RPO, Backups and Restores

When people design IT backup and restore processes, they typically focus on Recovery Point Objective (RPO), and Recovery Time Objective (RTO), with the goal of reducing both of those as much as the organization can afford.

Two hidden assumptions:
  • You instantly know when you have a problem.
  • You instantly initiate recovery.
Those assumptions are not always true!

Friday, October 22, 2010

Massive Disk Failure Deja Vu

Last year, we suffered through extended downtime and data loss on our primary server due to multiple disk failures on a large ZFS RAID-Z2 array. The disk array vendor found no trouble in the array or drives, and my confidence in ZFS was badly shaken. If you need to refresh your memory: Part 1, Part 2, Part 3, Part 4.

It almost happened again a few weeks ago, with some bizzare new twists.

Thursday, October 21, 2010

Love OpenDNS!

I've been using free OpenDNS Basic at home for many months now.

We recently switched our Comcast visitors network at work to OpenDNS FamilyShield to enhance visitor security and reduce our liability for visitor misbehavior.

Sunday, October 3, 2010

Even More on new Data Center HVAC

After another meeting with our HVAC subcontractor, I better understand the HVAC design for our new data center.

We will have two integrated systems; each system will have a blower added so we can move the CFM we require.

This design is even simpler than what I previously understood.

IPv6 transition ordered

We've been ordered to transition to dual-stack IPv6 plus IPv4 down to the client level in less than 4 years.

This will be a financial, operational, and security disaster.

Data Center Consolidation Gets Worse

Our data center consolidation goals were finally revealed to us - four months after the decision was made.

Current:  350 "data centers" (3 or more servers)

Goal: 5 data centers

Impossible.  Just impossible.