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Oct
19
comment mdadm & raid6: does “re-create(with different chunk size) + resync” destroy orig. data?
Because the RAID configuration was changed by creating a new superblock, the array would have started in an unclean state. Mdadm would therefore mark the array degraded and reconstruct its parity data. If the raid configuration matched exactly the way it was before, then it would simply be overwriting the old parity data with an identical copy. But otherwise, you'd be building a whole new array.
Oct
9
comment Best Server Hosting Technology for unscaled code
"Can someone guid me"? Sure! d294b9fc-2efa-45e6-8a0b-35ce69a238fb -- that one's yours.
Oct
7
comment memcache vs memcached?
If you're looking at this question now, please bear in mind that the accepted answer is wrong. Picking a solution based solely on the name is dangerous, particularly when the one with the better name is a worse project. Please look at the other answers for more information.
Oct
6
comment Mod Rewrite - Check for a file in a particular directory
Here's the documentation: httpd.apache.org/docs/2.2/mod/mod_rewrite.html#rewritecond
Oct
6
comment How to grow a hardware Raid 5?
It's worth noting that not all RAID cards can do live expansion. I spent quite some time talking to LSI, and the rep was very careful to explain that when expanding an R5 array, the array cannot be used until the rebuild finishes.
Oct
4
comment RCP (Remote Copy Protocol) in Ubuntu
@Xarem add'l information added
Sep
26
comment Process in the run queue
Note that "R" isn't the only "running" state, many times they'll show up as "D", which still affects your load average
Sep
21
comment What is cloud computing?
Not really. Cloud computing is based on virtualization. You're thinking of hosted applications.
Sep
15
comment Client Side certificate authentication failure
The comment about the client and server certificates being signed by the same CA isn't entirely accurate. The server certificate usually must be signed by a "commonly trusted" CA -- e.g. Verisign, Thawte, etc. The client cert must be signed by a CA trusted by the server, which is generally much more narrowly defined and application-specific, and may not include any of the "commonly trusted" CAs at all.
Sep
5
comment Why does wget get redirected to localhost when fetching an unresolvable page?
That's pretty weird.
Aug
29
comment How to broadcast ARP update to all neighbors in Linux?
@TomTom - perhaps you just haven't been working in the right environment to see it. Sending unsolicited ARP packets is a common way to quickly re-route traffic to a new server in a failover situation. Many high-end switches and routers can take several minutes to recognize that an IP address has moved to a different physical port otherwise. Cisco switches are notorious for this.
Aug
26
comment how to find a file
-print is unnecessary (it's the default)
Aug
18
comment Install Package dependencies separately over Cloud
Presumably you're writing a server management and provisioning system -- your "project that sets up packages on the cloud". It needs to know how to assign different servers to separate roles, such as "database server", "web server", etc.
Aug
17
comment Install Package dependencies separately over Cloud
You wouldn't use the server's package management system, since it's unaware of other servers. Instead, you'd bake it into whatever server management and provisioning system you're building. Or do it manually.
Jul
31
comment .htaccess to deny access to most xml files
Care to specify what the error message is? You'll find it in your error_log.
Jul
31
comment Where is apc.php?
I fail to see the sense to piping the output of find to grep in this instance, since find will only return names that contain the searched-for string.
Jul
31
comment Nginx rewrite URL only if file exists
This checks to see if the file exists, and if that test fails, it redirects to new_images. What happens after that is not specified here.
Jul
30
comment Virtual Machine memory usage not appearing in TaskManager
Unfortunately, there is no single number that indicates "how much memory" a process is using, since you get into complications like shared memory, file-mapped memory, paged-out memory and a few others. Here's a good explanation of a few concepts: stackoverflow.com/questions/1984186/…
Jul
30
comment Benefits of Gigabit uplink for high traffic webserver?
Not necessarily. Your cost/benefit of using EC2 for a simple web installation is not particularly appealing. Unless you need the benefit of dynamic server allocation, you can get 2x to 3x the performance per dollar running on dedicated hardware (at the right datacenter).
Jul
10
comment PTR record (rDNS) for multiple domains on a shared IP address
@Warner: the solution would be to make the MX record match the hostname, then. The MX record (target) doesn't need to relate at all to the email destination address.