* Posts by Roland 2

11 posts • joined 23 Jul 2010

Linux distros haunted by Polkit-geist for 12+ years: Bug grants root access to any user

Roland 2

Re: CLI strikes again...

Agreed that config/argument parsing should be done by a well tested library, but nothing much to do with CLI arguments vs. json config files.

There are plenty of poor ways to hand parse a config file too, with associated security issues.

Using an adequate library (think argparse in python, or clap in Rust) is not only safer, it also brings good error messages in case of misuse, arguably better that a security hole.

Twitter's machine learning algorithms amplify tweets from right-wing politicians over those on the left

Roland 2

Re: Who on earth

> Who on earth chooses "personalized relevance model" for their data?

You do as soon as you use Google search.

Which is a much bigger concern than what kind of political gibberish you see on twitter, as we all now more or less the the world through the lens of web searches.

BTW, am I the only one to notice that Wikipedia entries have moved down the Google result list in the last months?

Could that be correlated to zero ad revenue from Wikipedia?

Just guessing.

Intel, boffins invent an AI Clippy for code: Hi, I see you're writing another lock-free bloom filter. Can I help?

Roland 2

Not sure it's going to be useful

My experience with young software engineers is not having them reimplement known algorithm.

It's failure to recognize they need a known algorithm in the first place!

Like "do a topological sort" instead of a set of heuristics trying to figure out the right order in something.

Or "use a regexp" instead of a 20 line nest of ifs with startsWith, charAt and substring.

good luck detecting that with AI, but worth trying.

Feeling a bit gassy? Toshiba floats 16TB helium whopper

Roland 2

WTF is 550TB/year workload rating ? limited endurance or something else

I keep seeing endurance figures that seem ridiculous for a HDD.

For this model, the Toshiba spec sheet's exact wording is:

"550 Total TB Transferred per Year Workload Rating"

If this is an endurance limit as for an SSD, this would be less than 0.1 full drive read or write per day!

Or is this a prerequisite for the 2.5 Mh TTF ?

If it is, it means : "this drive may last, provided you don't use it"

Can some bright mind explain?

Toshiba gets NASty: Soups up hi-cap enterprise drive

Roland 2

A little surprised by that bit:

"The MNO7 has workload ratings of up to 180TB per year. "

It being a 14TB drive, does this mean the endurance is 0,03 full drive write per day ?

I thought endurance was still a selling point vs. SSDs.

Something strange stirs in the storage backwater swamps, long ribbons of rust that never forget

Roland 2

Re: The truth is tape is more reliable

As as shop that did the move from tape to disk 6 years ago, I do confirm that the operational experience here is that disk is more reliable than tape. We no longer experience things like "not this backup, it's corrupted/incomplete/eaten by the dog, take the previous one", or wait hours to apply incremental dailies.

The BER issue (assuming there is one) it totally hidden by RAID 6 + replication.

As of cost, the whole driver for the project back then was cost reduction.

NetApp shrinky-dinks ONTAP 9: Will support 4:1 data reduction

Roland 2

Re: NetApp should clarify the 4:1 claim

> Including thin provisioning is rediculous.

I think it's fantastic. Allows the customer to upgrade from 4:1 to 400:1 in a second by just thin provisioning more non-existant space.

Seriously, any vendor claim is legitimate if it documents exactly what ratio can be attributed to what reduction technology. Like Compression 2:1, dedupe 2:1 Thin provisioning:1.5:1 Overall 6:1

You may then get a quick figure for a given use case. Like database of unique png images, 20% thin provisioned: ratio = 1.2:1

I'm not sure Pure is much more transparent in that respect.

This supercomputing board can be yours for $99. Here's how

Roland 2

What about memory bandwidth ?

Most HPC real world workload require significant memory bandwidth to keep the core busy.

Even more so for Hadoop style parallel processing.

How much memory bandwidth does the 64 core part have ?

Secret's out: Small 15K disk drive market is 'growing'

Roland 2

15K growing or 2.5" growing?

Could it be that the 2.5" 15K drives segment is growing at the expense of 3.5" 15K drives, and that the whole 15K HD market is in fact stagnating ?

Where's El Reg critical mind ?

NetApp patents Hybrid Aggregates, sneers at PCIe

Roland 2

Cache needs to be closer to the server to be efficient

If your disk has 5ms latency and array/network has 1ms, you see 6ms of latency from the server. Let's say some amount of flash will give you a 80% hit rate, with 10 microsecond latency.

If you place the cache near to the disks, you get 2 ms average latency from server.

If you place the cache on PCI-e on server you now see 1.2 ms latency, and you alleviate 80% of the traffic on the array on a read workload, so you end up also saving on array iron.

Fusion-io's flash memory OS plug-in

Roland 2
Thumb Up

Fusion-io cards as an NFS IO cache ?

While tackling OS integration, what would really be welcome would be a cacheFS integration, so that NFS mounts to Linux or VMware hosts could hide most of the network latency through a 620 Gb cache.

This would be a huge application performance and network traffic win, while being totally transparent to applications.

(right now our applications cache hot data manually to the Fusion-IO cards. not transparent!)

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