ReFS integrity is not on by default
I really don’t like the trend of filesystem authors to only care about filesystem integrity by default. How about having seat belt for your data integrity by default and let people turn it off if they want to compromise correctness for performance?
What I didn’t know is that ReFS integrity is not on by default. Only metadata integrity.
It’s also not visible or changeable in the UI (which is why I assumed they’d done the right thing), which is strange to me, this being Windows. No, you have to drop down into Microsoft’s crappy CLI.
How to check if it’s turned on.
Check files in one directory
PS E:\> Get-Item '*' | Get-FileIntegrity
FileName Enabled Enforced
-------- ------- --------
E:\SomeDirectory False True
E:\SomeOtherDirectory False True
E:\SomeFile.txt False True
[...]
Fuck you, Microsoft.
Check recursively
Of course Get-Item doesn’t do recursion. Why would it? That would
make sense.
PS E:\> Get-Children -Recurse 'E:\SomeDirectory' | Get-FileIntegrity
FileName Enabled Enforced
-------- ------- --------
E:\SomeDirectory\foo.txt False True
[...]
How to enable it
Both commands are needed. The first command sets the new default for the root directory, and the second adds checksums to all existing files and directories.
PS E:\> Continue readingJuniper Networks Introduces Contrail Security for Cloud
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BGP Persistent Oscillation
After Daniel Walton visited the History of Networking at the Network Collective, I went back and poked at BGP permanent route oscillations just to refresh my memory. Since I spent the time, I thought it was worth a post, with some observations. When working with networking problems, it is always wise to begin with a network, so…
For those who are interested, I’m pretty much following RFC3345 in this explanation.
There are two BGP route reflectors here, in two different clusters, labeled A and D. The metric for each link is listed on the links between the RR clients, B, C, and E, and the RRs; the cost of the link between the RRs is 1. A single route, 2001:db8:3e8:100::/64 is being advertised in with an AS path of the same length from three different eBGP peering points, each with a different MED. E is receiving the route with a MED of 0, C with a MED of 1, and B with a MED of 10.
Starting with A, walk through one cycle of the persistent oscillation. At A there are two routes—
edge MED IGP Cost
C 1 4
B 10 5 (BEST)
When A runs the bestpath calculation, Continue reading
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What is Attachment Circuit in MPLS VPN ?
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How I’ve Attempted to Blog More in 2017
This post has been sitting in the “drafts” folder for a while now. Clearly, since it’s August and is therefore a little late to be deciding on a plan that is supposed to carry through all 12 months of 2017. Regardless, I think it’s still worth sharing how I’ve attempted to increase the frequency of my blogging. My basic goal for 2017 is:
Create more content in 12 months than I ever have before in order to a) significantly build up the depth and breadth of knowledge on my blog, b) increase my skills as a writer, and c) continue to build this blog and the readership as a key part of my online persona and brand.
In order to achieve this goal, I’ve identified a couple of tactical objectives:
- Reduce the friction between me and the keyboard; make it possible to “just write”.
- Be able to “just write” anywhere. At home. On vacation. In a waiting room. On an airplane. I should also be able to start a post in one location and pick it up again in another. Indirectly this means I need to be able to write on any of my computers or mobile devices.
In order Continue reading