565 reputation
210
bio website zlynx.org
location Greenwood Village, CO
age 39
visits member for 5 years, 4 months
seen 1 hour ago

Nothing interesting about me. This is not the user you are looking for. Move along. Move along.


May
22
comment Packet loss on between firewall and uplink?
I've seen these intermittent problems caused by either bad cable or failing ports combined with link autonegotiation. It glitches and thinks it is 10Mbit half, for example. It might work fine forever just by forcing the connection type. Remember to do both ends.
Apr
15
comment 4TB drives using an ARC-1231 controller?
@StefanLasiewski: A new RAID controller is as likely to fail as an older one. If really new, even more likely.
Apr
9
comment Why is 1 of my 24 CPUs Pegged at 100%?
Couldn't that also be a driver bug or a piece of bad hardware interacting with a driver with no error recovery? Or maybe software calling into the kernel in a tight loop.
Mar
31
comment Force edit txt file that is in use windows
I remember seeing programs that would forcably break file locks. I believe they did it by attaching to each process with the lock and closing the file handle from inside the process.
Feb
16
comment Tuning Linux disk caching behaviour for maximum throughput
@PeterMeyer: Even if you have a lot of RAM it is still a mistake to wait for writes to start. The only time that makes any sense at all is if you are going to be editing or deleting files (like a temporary file) before it would get to disk. A backup does not do that. You want to start background writes as soon as possible. Set your background_ratio to 1 or 2.
Feb
15
comment Tuning Linux disk caching behaviour for maximum throughput
Wouldn't it make more sense to start writing as soon as possible? Otherwise it reaches the maximum buffer size and suddenly comes to a halt. If it was writing all along it gives you more time.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
I added some info about proc mounts to the question.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
@DavidSchwartz: Right. Since these are virtual systems there aren't any real local disks. It's all virtual. The "local disk" is a VMware image backed by iSCSI.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
Sequential read/write runs at 80MB/s per second, so that part of the NFS tuning is okay.
Nov
30
comment In TCP/IP terms, how does a download speed limiter in an office work?
@TessellatingHeckler: The method that I like also enables the use of ECN which actually does tell the sending server to slow down without dropping packets. This method is to apply the rate limiter such as RED to packets leaving on the LAN interface, instead of trying to use an ingress filter on the WAN interface.
Nov
23
comment Networking Units: Not getting expected performance from 100Mb Ethernet
@MarkM: If you look at the reviews of NAS equipment, you will find that 40/20 MB/s is not an unusual speed.
Nov
23
comment Hot spare or extra parity drive in RAID array?
+1: I agree. I see no reason to use RAID-5 when RAID-6 is available. Benchmark the hardware. It should be able to do RAID-6 at full speed, or nearly.
Nov
23
comment Networking Units: Not getting expected performance from 100Mb Ethernet
@Sirex: Oh well, yes that is true. But the network will be 10x faster.
Nov
23
comment What happens when a consumer switch receives a VLAN-tagged Ethernet frame?
Eh. Linux end-point devices handle tagged frames just fine. I have seen them do it.
Nov
18
comment Copy large files to multiple machines on a LAN
@user606723: Doesn't everything modern? Maybe some consumer junk does not, but I haven't run into anything with broken multicast in a while. Too much uses it these days. I think Windows Active Directory even uses multicast.
Nov
7
comment What is ECC ram and why is it better?
@JeffAtwood: And, like everyone I am sure, I've occasionally had to reinstall an application (Office. Visual Studio.) because it has apparently gone insane. App bug or ECC error causing a corrupt disk file? Who knows if you don't have ECC?
Nov
7
comment What is ECC ram and why is it better?
@JeffAtwood: Nothing usually, but I have had the occasional blue-screen for no apparent reason. On systems I have which do have ECC I will see a couple of single bit errors each month.
Oct
28
comment Is there a good way to keep IPv6 multicast packets off WiFi?
If it is multicast packets then why is the wifi sending them? It should only be sending a multicast packet to a network if there is someone listening for it on that network.
Oct
28
comment Linux IPv6 Transparent Proxy (but Linux doesn't support NAT on IPv6!?)
@coredump: Because transparent "Just Works" while automatic proxy only sometimes works and the users think the internet is broken.
Oct
28
comment Will everyone having Globally Accessible IP's in IPv6 be kind of a security nightmare?
@JohnGardeniers: Your concern is why IPv6 added temporary private addresses. Windows uses them by default. What it does is outgoing connections use a randomized temporary address. Incoming connections can connect to the permanent system address if you have publicized it.