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Jul
22
answered dd vs. dd pipelined: which is better?
Jul
21
comment Consumer (or prosumer) SSD's vs. fast HDD in a server environment
I upvoted this even though I disagree. Certainly supercaps etc are a good idea for an SSD - hence the upvote - but it implies that consumer SSD's are unreliable - I don't believe this is correct - in fact I assert they are 10 times as reliable as spinning hard drives. Also, hard drives don't have supercaps or equivalent - and indeed are more vulnerable to power outages. The thing is that modern filesystems have journals to mitigate the risk of loss (and there are certain speedups you should not use on a drive unless it has a supercap / battery backup)
Jul
21
comment Consumer (or prosumer) SSD's vs. fast HDD in a server environment
@DevlevCm The report you linked to (which I was familiar with and is quite good) confirms this behaviour of the Intel drive dispapearing on reboot on the "More Casualties" page. The Samsung drive outperformed the Intel - and that was the older 840 series - the 850 series is supposed to have a much longer lifespan again ! I do like Intel drives as well though.
Jul
21
comment Setting up a shared team folder (served to the web) - Best Practices?
As a hack, what about formatting the filesystem as VFAT, and mounting that group writeable ?
Jul
21
comment centos doesn't reply to icmp request
What happens if you disable reverse path filtering ? slashroot.in/… )
Jul
21
comment Consumer (or prosumer) SSD's vs. fast HDD in a server environment
@JourneymanGeek - I think the 850 EVO and 850 Pro both use 3d nand - it is the 840 series that doesn't. This is backed up by Samsungs site - samsung.com/global/business/semiconductor/minisite/SSD/global/… - I'm a lot less certain, but I think the 850 pro has supercaps and better engineering, but the memory is very similar if not identical.
Jul
21
answered Consumer (or prosumer) SSD's vs. fast HDD in a server environment
Jul
18
answered Can ping server one from client 1, but can't ping client 1 from server
Jul
13
answered How To Tell If The CPU Is Dead
Jul
8
comment Download speed from server extremaly slow
The oher thing to look at is your Network card - many Realtek network cards, for example are not good at handling large volumes of traffic, and have multiple drivers which give very differing performance. See if rebooting your system helps initially, and possibly try a different network card - I would suggest Intel cards for compatibility, speed and ease of getting to work.
Jul
8
comment Download speed from server extremaly slow
If what you have said about the problem disappearing after 2-3 weeks is true the issue is most likely with your provider, but there are a couple of possibilities on your end/possible mitigations you may want to follow up - The first is MTU clamping. Try the command "iptables -I OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu" which might fix TCP connections if your ISP is running an MTU lower then yours - if this works you may want to try removing the line and setting a lower MTU on your device. The other thing to look at is the network card - can you advise what it is?
Jul
7
answered Changes to php.ini have no effect
Jul
7
comment Can apache redirect to a URL but mask the new URL?
Not the answer to your question, rather a bypass - but if its all being done in Apache, you should just be able to add a line "ServerAlias x.y.z a.b.c ..." which lists all the alterative domains Apache will answer for without actually rewriting it.
Jul
7
comment Will computers connected to a switch have a different ip?
Virtually no switches will offer DHCP - this is typically done by the router.
Jul
6
comment iptables: trying to block port 53 but not working
This assumes that all the hosts are Linux boxes - and that the OP controls all the hosts. If he did, why would he need to ask this. Also, using "-A" rather then "-I" would mean the rule is appended, and probably not seen - for the same reason the OP's rules probably don't work - Centos - and almost certainly others have an explicit rule blocking traffic, rather then rely on the default. Further it does not block port 53 traffic to 192.168.1.1 as requested by the OP - and the equivalent rule for that host fails as the OP has pretty much stated.
Jul
6
comment iptables: trying to block port 53 but not working
We also need a network diagram. Does 192.168.1.1 act both as firewall and router, or do you have 2 seperate boxes? Also, we may need to see the IPTABLES rules - I suspect there is a problem with ordering - please provide the output of iptables -vnL
Jul
6
comment iptables: trying to block port 53 but not working
Sorry, this is wrong - the OUTPUT table does not work with packets which are traversing through it - only traffic originating from the address - This would have worked if you are testing from a local machine, but not a router - which requires both output (for the router to be blocked) and forwarding (for everything else) chains to be modified
Jul
5
comment Can a root server delegate specific subzones of a domain to different nameservers?
@Kondybas solution is correct - it does not, however, show optional TTL's which can be specified (I guess because this is not the question). The caching nameserver will ask the authorative server for the zone information, and cache that, and it will traverse that tree - ie it will cache the NS record for each subdomain and then look it up as required assuming the TTL for that zone has expired.
Jul
4
answered When should I consider a 2 socket motherboard for Server?
Jul
4
comment When should I consider a 2 socket motherboard for Server?
Sorry, I flagged this question as primarily opinion based, and it is thus not really suitable for SU. I'll try answer it though.