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Jul
17
comment Scaling large file downloads?
caching in my opinion is not going to solve a system that is heavy IO intensive unless you have tons of RAM to keep most of these "large" files in memory which seems unlikely. How large is "large?" "Large" to means implies GB size files requiring many disk flushes. What is your disk sub-system today? (RAID hardware, softwware, SAN, NAS, what?) Post your VMSTAT and IOSTAT dumps. If this is Linux, also post your HDPARM -t and -T output for each disk and possibly some FIO tests if you can.
Jul
15
answered Scaling large file downloads?
Jul
15
comment DNS - Any way to force a nameserver to update the record of a domain?
ipconfig /flushdns does not flush the DNS cache of a Windows DNS server; it only flushes the client's cache. To flush a Windows DNS server cache, open DNS under Administrator Tools, expand the server object, right click cached objects and select clear cache. nscd is not on my distro. In that case, just killall named and restart it; usually /etc/rc.d/rc.bind start
Jul
13
awarded  Critic
Jul
13
comment Management of Static IP Addresses in the data center
"There really isn't anything wrong with using DHCP on a server IP address." Disagree. Couple reasons: 1. If you have an outage and servers are booting up, you now have a dependency situation where the DHCP server must be up before other servers; else you have a race condition. 2. If DHCP is down, servers can't get an IP. 3. While minimal, you cause your server to take longer to boot up.
Jul
11
answered 5400 RPM vs. 7200 RPM 2.5" Drives in RAID - Any Real Difference?
Jul
11
comment Easiest way for fast transfer of files between linux servers?
tar, by itself, is not reliable - there is no integrity checking however with SSH (TLS) you get integrity due to TLS's ability to detect in flight changes to data. Rsync is a better choice and Rsync as it will do better integrity checking without encryption; the OP stated encryption was not necessary.
Jul
10
comment What kind of router do I need?
food for thought, then. If you are providing Internet access for the other companies (subnets) then I hope you realize that depending on how you set this thing up, you would be routing traffic over multiple RFC1918 addresses before NATting the outbound traffic. Or where you planning on giving each subnet their own NAT? or NATing their subnets onto yours? You have some things to think about and how they may related to hosted applications, SSL, etc... Again, I not knowing your complete goals/setup these are common points of consideration in such a setup.
Jul
10
comment What kind of router do I need?
200 IPs in a subnet is not considered large in terms of performance of a recent switch; even the cheap ones you can get from a local computer store; assumption here is we're talking about IP traffic only and well behanved applications (layer-7). Layer-2 is not a problem for this many IPs. However, having separate companies, makes sense to segregate into their own subnets but why are you routing or connecting all these subnets would be my question if they are separate companies presumable with their own servers and applications and such.
Jul
10
comment Sharing static IPs between Virtual Maschines
Well, two things: (1) You can't reduce cost at the expense of violating basic network fundamentals. You cannot have the same IP on two VMs or machines on the same subnet because your ARP tables would get confused. (2) Not knowing your situation, I can't imagine the cost savings related to reducing IPs! It seems like hair splitting to me but here is a thought. Can you use one public IP and two RFC1918 addresses and not be charged for those?
Jul
9
comment Multiple login names for a single user in linux using LDAP server authentication
compact allows us to support NIS +/- in /etc/passwd. Pozix Linux is a scaled down Linux distribution and part of the distribution is NIS & NIS+ and we ship with NSSLDAP support in the lib6; most modern distributions adhere to this philosophy too. However, you are right, we could do away with compact and use file if we had no need to support NIS or NIS+. The other part of your question about onlyh having sys accounts, if that were the case then we would not swap the nsswitch.conf file at all; we only do this if user wants LDAP authentication. See my comments about NSCD again too. ;)
Jul
9
comment Community Input on Backup Solutions
At 3000 miles, I would imagine you have a latency of around 40 to 50ms; typical of a major telecom using DWDM. So your replication is either write local and wait for the remote to return or cache & queue. So naturally, you have to decide if this is good enough for DR. For backup, you still haven't spoke to the retention needs and to the importance of historical data. Importance is typically the cost to the company if the data was lost for good.
Jul
9
answered What kind of router do I need?
Jul
9
comment A Fresh Windows Server Network Build
another seasoned IT guy here that mostly agrees with Evan Anderson's comments but wanted to point out that 99% of IT work is setting expectations. and to the point, Databases on VMs don't scale; performance tanks under load. I'm also a VMWare & Power5 architect for a large company.
Jul
9
answered Safely deploying/hosting a virtualized domain containing a DHCP server
Jul
9
answered Configuring power outage shutdown via APC UPS's
Jul
9
answered Sharing static IPs between Virtual Maschines
Jul
9
answered Community Input on Backup Solutions
Jul
9
answered Can't read an LTO-3 tape on a different LTO-3 drive
Jul
9
answered What strategy should i use to install smtp server on linux ? for multithreaded service