Author Archive
Happy new 2015 year
Howdy! By now we’re all in the same new 2015 year and I want to wish everyone a peaceful, prosperous and fruitful year. May all your dreams come true. HO HO HO
How Cisco Ironport picks an outgoing IP address if there are many on the same subnet
If your IronPort is configured with multiple IP addresses on the same subnet and you wonder which one is used then Cisco has an answer for you: Q: Which is the default used IP address (AUTO) if there are multiple IP addresses on the same subnet? A: If there are multiple IP addresses configured within […]
ruBSD 2014 is coming
Just like in year 2013 Yandex will be hosting ruBSD 2014 (content is in Russian) event on the 13th of December. It’s funny that I learnt about it from BSD Now podcast which, btw, I highly recommend. In the last episode, apart from the already mentioned ruBSD 2014 conference, Allan Jude and Kris Moore also […]
Jumping into another cloud
After almost 4 years of being a Rackspace user I’ve moved to a new home – Amazon AWS. The main reason that gave me a nudge was the issue I was hit by after upgrading to 10.1-Release. Temporary solution did work but it was too costly to consider it as permanent so I started to […]
FreeBSD 10.1-Release as domU (guest) VM
I’ve been running FreeBSD 10.0-Release for quite a while using Rackspace’s environment and yesterday decided to jump on 10.1-Release bandwagon using exactly the same steps which I described in on of my earlier posts. However it wasn’t successful as expected since I see constant freezes with the following errors being displayed in the console: network_alloc_rx_buffers: […]
ZFS RAIDZ stripe width explained
Frankly speaking, dynamic stripping part of ZFS was never clearly understood by me, until I came across the following article by Matt Ahrens – http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/. Really worth reading.
What the heck are all those terms – PV, HVM, HVM with PV drivers, PVHVM, PVH?
If you have to deal with Xen from time to time and not on a permanent basis and want to refresh the difference between all those Xen modes, I strongly encourage everyone to read the following two outstanding articles: The Paravirtualization Spectrum, part 1: The Ends of the Spectrum The Paravirtualization Spectrum, Part 2: From […]
Default Linux I/O multipathd configuration, SCSI timeout and Oracle RAC caveat
I’ve been recently involved in a project to migrate from old and rusty Cisco MDS 9222i to the new MDS 9506 SAN switches and during the first phase of the migration the primary node in a two-node Oracle RAC cluster lost access to its voting disks and went down. And that’s when only half paths […]
Solaris 11.2 beta is available
Yesterday Oracle announced the availability of Solaris 11.2 beta with a bunch of sweet enhancements, e.g. Openstack, Solaris Kernel zones, Unified archives, Compliance check and reporting, Automation with puppet and more. Find more by reading Solaris 11.2 Beta – What’s new For those who is interested in a hands on experience Solaris11.2 beta is also […]
Like to fiddle with VMAX FAST VP options?
Don’t do that and here is why: VMAX FASTVP Best Practice Essentials