XtremIO and VMware Path Failure Detection

In XtremIO XIOS version 4.0.10 we made an (optional) change to the SCSI error codes that the array returns to ESX hosts under certain circumstances. To understand the difference, we first need to understand a little about how VMware acts when a LUN disappears for some reason. When…

#Tags: xtremio, vmware, APD, PDL

Hacking Package Pickup

Just over a week ago my apartment complex launched their new "Package Pickup Center" - an automated locker system much like those that Amazon and others are using to allow 24x7 collection of packages. Like all of these systems, it consists of a number of computer-controlled lockers, and a screen…

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The Latency/Threads Relationship and HA Testing

One of the most common mistakes people make when testing storage is that they think they are measuring IOPS or bandwidth, when all that they are actually measuring is latency. As a simple example, lets say that we have a storage device that takes 1ms to respond to an IO…

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More Insecure IPTVs

Last year I blogged about how I had fairly easily "hacked" the IPTV setup at a hotel in Asia, using little more than some Google searching to find a default password. If default password weren't bad enough, a few weeks ago I managed to find something worse - a hotel…

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Automating Oracle Snapshots

I've previously written about how to Creating a new Oracle Database using an Array Snapshot, but this process involved a lot of manual steps - obviously the best way to handle this is to actually script the steps to automate the entire process. The following script is an example of…

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Creating a new Oracle Database using an Array Snapshot

Over the past few months I've worked with a number of customers who have been struggling to use array-based snapshots to create a copy of their Oracle database. The problem isn't the array side of things (which is generally as simple as a few mouse-clicks), but the Oracle side which…

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