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Mar
15
comment TCP: out of memory - Nginx
How much RAM does your system have? How much can you spare? How many connections do you expect to have at once?
Mar
15
comment TCP: out of memory - Nginx
Those still seem very low. My machine has default values, and it has set itself to net.ipv4.tcp_mem = 380964 507955 761928. Your settings max TCP out at 372MB or so.
Mar
10
comment How to resolve UDP packets being dropped given netstat reporting SndbufErrors
@eddyP Transmit pacing means that you carefully control the timing of datagram sending to avoid datagram loss. If you don't do this, you should expect to lose lots of datagrams because that's how datagrams work. Errors won't necessarily be reported because the loss can occur at various different points in the path and each error counter only tracks some single point. You likely need to set a burst level and a data rate and delay sending UDP datagrams that exceed the allowed data rate and burst level. Otherwise, a "clump" of datagrams will result in loss somewhere.
Mar
10
comment How to resolve UDP packets being dropped given netstat reporting SndbufErrors
@eddyP Does the application do transmit pacing? If not, you should expect to lose lots of datagrams.
Mar
4
comment RAID5 recreate without loosing data or recovery
Generally, recovery wouldn't be attempted in this case. The whole point of RAID is to minimize downtime. By trying to recover the data, you're increasing your downtime, defeating the whole reason you chose to use RAID in the first place. If you really want to do recovery, before you do anything else at all, image all three disks.
Mar
1
comment Address already in use… could not bind to address… no listening sockets available
Did you issue that netstat command right before you got the error? Otherwise, it doesn't really prove anything.
Feb
28
comment Detecting IP Conflict
@joeqwerty Your comment is correct if by "switch" you mean a device that operates only as a layer 2 switching device. But he may well have a box that acts as a switch that he calls "the switch" that cares very much about IP addresses.
Feb
26
comment Linux tmpfs and out of memory
"the servers starts swapping, the out of memory is reached and the system crashes." The problem itself should be described in great detail, not mentioned in one sentence with no details.
Feb
22
comment IIS using only one processor on a dual CPU server?
What CPUs does the server have? Are you sure it's not using all physical cores and just not using multiple virtual cores that share a physical core?
Feb
18
comment Does Ping ever uses DNS cache
@Viren Well, nsswitch.conf would probably be more useful. We need to know what name services you're using.
Feb
18
comment Does Ping ever uses DNS cache
We have no way to know how the resolver is set up on your machine.
Feb
14
comment Two IP-Adresses one NIC
Are you sure the interface isn't already up?
Feb
11
comment Why would a university block incoming UDP traffic with destination port 53?
@FedericoPoloni Just don't pretend that you're providing "Internet access" if you do this, because you're not.
Feb
10
comment ThinkServer x3550 M3: AES-NI disabled?
Check for BIOS options related to CPUID or limiting the CPU revision.
Feb
8
comment high outgoing traffic on WAN port, but small trafic on LAN port in ZyXEL router
It could be an attack on the router coming from the Internet. Your router may be being used to attack someone else too.
Feb
6
comment Centos 6 soft openfiles 1024?
How is the control panel launched? By systemd?
Feb
6
comment Centos 6 soft openfiles 1024?
There is no "system based max open files", as far as I know. Again, it depends what it is you're trying to do, which you still haven't told us. Whatever launches these scripts either understands limits or doesn't. If it does, tell it to set the limits how you want. If it doesn't, then set the limits before launching the thing that launches these scripts. For example, systemd supports LimitNOFILE.
Feb
6
comment Centos 6 soft openfiles 1024?
He's already got that part covered. Notice the output of ulimit -n in his question? His issue seems to be with processes that weren't created by a user logging in.
Feb
6
comment Centos 6 soft openfiles 1024?
Can you explain what your outer problem is rather than telling us how you've attempted to solve it? Is there some specific process that needs a higher limit? If so, which process and how is that process being started?
Feb
2
comment Why does a URE cause loss of array during RAID 5 rebuild?
@StrongBad If there's a URE, the rebuild fails. I think you're still missing the entire point of RAID, which is to permit you to continue to operate reliably even if a disk fails, that is, to minimize downtime. As soon as you can't operate reliably, that's it, the RAID has failed. You will always have downtime to get back to reliable operation.