22,218 reputation
12450
bio website ripplelabs.com
location Oakland, California
age 45
visits member for 3 years, 5 months
seen 15 hours ago

I am Chief Cryptographer at Ripple Labs and one of the architects of the Ripple payment system.


Feb
15
comment Disk Throughput Terminology
@Dan If Windows locked the file on a write and the program didn't close/reopen the file on every write, there either would have to be no write lock at all or a continuous write lock. With a continuous write lock, how could the reader ever get in? If you want to use a file this way, both ends have to be designed to use appropriate file locks at application level. Even then, it still might not work, but at least it has a chance.
Feb
15
comment Disk Throughput Terminology
@Dan Right, but are the applications doing the reading and writing actually placing locks?
Feb
15
comment Disk Throughput Terminology
@Dan If you're not using file locks, you're asking for trouble.
Feb
15
comment Disk Throughput Terminology
@Dan: Does the reader hold file read locks when it reads/stats and the writer hold file write locks when it writes? How does the reader decide when to read/stat?
Feb
15
comment Disk Throughput Terminology
What protocol do the computers use to access the NAS?
Feb
15
comment 8MB/10K RAID5 vs 2x 64MB/7.2K RAID10
The cache will have no significant effect. The cache only needs to be big enough to adapt the transfer rates of the two interfaces and every disk made in the last decade has had a cache big enough to do that.
Feb
15
comment Loop redirect when ping my gateway
What IP address were you pinging? And is 192.168.1.88 the IP address of the machine you were pinging from?
Feb
14
comment Controlling traffic on a small subnet
That's what BVI and IRB are for.
Feb
14
comment Controlling traffic on a small subnet
Why can't you connect the modem to a regular Ethernet port on the router rather than a switch port?
Feb
14
comment Controlling traffic on a small subnet
The only difference that would make would be that he would have one more address to play with. Otherwise, nothing would change.
Feb
14
comment Nameserver can't be resolved globally. Server has been down for 30 hours
@blackd0t I can traceroute all the way to them. The hop before either of them is 77.67.82.27.
Feb
14
comment Secure disk wiping tool for Windows
I would strongly recommend not doing it from within Windows. You really have no assurance that the drive was properly wiped. Portions of the drive not accessible to Windows won't be wiped. Among other things, rootkits like Alureon hide portions of the drive from Windows. I have seen people wipe an infected drive from an infected system (leaving the infection on the MBR and end of the drive), reinstall Windows after a boot from an infected MBR, and still be infected after a wipe/reinstall.
Feb
14
comment Nameserver can't be resolved globally. Server has been down for 30 hours
Glue records are working, the servers they point to aren't. So ns1/ns2 are all you can resolve.
Feb
14
comment How Do I Block an IP Address on ubuntu?
Are you trying to block the IP from connecting to the machine? Or from routing through the machine? The INPUT chain is only for packets that are delivered locally. (Check ip route show table local to see what is local.)
Feb
14
comment How do you control which portion of SQL Database gets loaded into Server Memory?
@user1034912 If so, there's really no point in forcing it to pre-load the latest data, since the first old query would just cause it to be unloaded. The SQL server will do the right thing -- if it is beneficial to keep information in RAM, it will keep it in RAM. If it's better to use the RAM for short-term data, that's what it will do. Do you really think you no how to design an SQL server's use of memory better than the guys who designed your SQL server's use of memory? (If so, you should design your own SQL server.)
Feb
10
comment building computer with fastest clock (overclocking)
Can you link to actual Dell policy on the issue? I'm not convinced by personal anecdotes. It's entirely possible, for example, that you broke the computer by overclocking it. They may have said the warranty doesn't cover damage caused by overclocking. We don't know. Dell's official policy statements all say otherwise, that overclocking will not void your warranty, and it would be illegal to void the warranty in the United States (under Magnusson-Moss).
Feb
10
comment building computer with fastest clock (overclocking)
Will this myth ever die? Overclocking does not void your warranty. You will never find any statement from either AMD or Intel that says that overclocking voids your warranty (especially since such a statement wouldn't be legally valid in the United States anyway). (You may find a statement that your warranty doesn't cover damage caused by overclocking, but that is not the same thing?)
Feb
9
comment How does Windows manage file versions across different Windows Updates?
The hotfix confirms the versions before it updates and has logic to update from various previous versions. A hotfix installation will never unintentionally downgrade a file.
Feb
8
comment How come the netflow data isn't showing up on the server?
Take a look closely at them. If they look valid, then check the logs of whatever is supposed to collect the data from them. (flow-capture, I assume.)
Feb
8
comment How come the netflow data isn't showing up on the server?
Do you see any flow packets being sent? That will split the problem space in half.