technology, networking, virtualization and IP telephony
I ran into an interesting issue tonight looking at an HPE MSA 2050..
I was creating a RAID6 disk group with 5 x 4TB SAS drives, but the MSA was telling me that I would have 119TB of space available?
There should be 20TB of raw space and approximately 12TB (4TB * 3) of usable space with 2 drives for parity.
Then I looked a little closer….
11.9TB you dummy…. I knew I had to share this exciting technical break through with you guys! Happy Friday!
Cheers!
I recently upgraded my in home WiFi from Extreme/Zebra/Motorola RFS4010 with two AP650s with two Aruba IAP-205s. Here’s the configuration I used in setting up those Aruba IAPs.
We need to set the country, enable SSH (terminal-access), set the NTP server and timezone and enable both RF bands.
virtual-controller-country US terminal-access ntp-server 192.168.1.1 clock timezone Eastern-Time -05 00 clock summer-time EDT recurring second sunday march 02:00 first sunday november 02:00 rf-band all
Next we need to set some parameters for Adaptive Radio Management (ARM). We’ll enable 80 MHz and 40 MHz wide channels for the 5Ghz radio, set the min and max radio transmit power, enable band steering, set air-time fairness, and allow the APs to occasionally scan the RF space. We’re going to omit the “client aware” option because that will prevent the IAP from changing channels if there is a client associated to that specific IAP.
arm wide-bands 5ghz 80mhz-support min-tx-power 18 max-tx-power 127 band-steering-mode prefer-5ghz air-time-fairness-mode fair-access scanning no client aware
Let’s set the admin password for future use
mgmt-user admin securepasswordforadmin
Here we’ll create a simple ACL for our WLAN, we could restrict traffic using this ACL if we needed to.
wlan access-rule MYWIFIWLAN rule any any match any any any permit
Here’s the meat and potatoes, we will create an SSID called MYWIFIWLAN with WPA2/AES PSK authentiation. It will be advertised over both 2.4Ghz (802.11b/g) and 5Ghz (802.11a/n) radios with a minimum Tx bandwidth of 5Mbps on the 2.4Ghz band and 12Mbps on the 5Ghz band.
wlan ssid-profile MYWIFIWLAN enable type employee essid MYWIFIWLAN wpa-passphrase MYWIFIWLANPSKPASSWORD opmode wpa2-psk-aes max-authentication-failures 0 rf-band all captive-portal disable dtim-period 1 broadcast-filter none g-min-tx-rate 5 a-min-tx-rate 12 dmo-channel-utilization-threshold 90 local-probe-req-thresh 0 max-clients-threshold 64 okc dot11k dot11v
I was originally using a broadcast filter of ARP with AirGroup enabled but my daughters quickly let me know that they could no longer play Minecraft together (peer to peer) on their laptops when connected to the wireless network. The client is likely using a broadcast packet to locate the server and the IAP was blocking the broadcast packet.
Cheers!