Install a new hard drive

Got it from here.

1. Partition disk
samdc@mango:/dev$ sudo fdisk /dev/sdc

Welcome to fdisk (util-linux 2.25.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0xb73af669.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-1953525167, default 2048): 2048
Last sector, +sectors or +size{K,M,G,T,P} (2048-1953525167, default 1953525167): 

Created a new partition 1 of type 'Linux' and of size 931.5 GiB.

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

2. Format disk
samdc@mango:/dev$ sudo mkfs -t ext4 /dev/sdc1
mke2fs 1.42.10 (18-May-2014)
Creating filesystem with 244190390 4k blocks and 61054976 inodes
Filesystem UUID: 6dba4379-83fa-4288-b390-98574bc24bb2
Superblock backups stored on blocks: 
 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
 102400000, 214990848

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done     

3. Modify reserved space
samdc@mango:/dev$ sudo tune2fs -m 1 /dev/sdc1
tune2fs 1.42.10 (18-May-2014)
Setting reserved blocks percentage to 1% (2441903 blocks)

4. Label disk
samdc@mango:/dev$ sudo e2label /dev/sdc1 DataDisk2

5. Create mount point
samdc@mango:/dev$ sudo mkdir /data2

6. Mount the drive
Automatic mount at boot:
root@mango:/dev# vim /etc/fstab
Add this line (find out UUID of the disk via blkid):
UUID=6dba4379-83fa-4288-b390-98574bc24bb2 /data2           ext4    defaults 0       2
For changes to take effect:
root@mango:/dev# mount -a

Manually mount/unmount:
sudo mount /dev/sdc1 /data2
sudo umount /data2

==============================================
hostname:mango, os:Ubuntu 14.10 Utopic Unicorn
==============================================
ASRock Z97 Extreme6 LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Intel Core i7-4790 Haswell Quad-Core 3.6GHz LGA 1150 84W Desktop Processor Intel HD Graphics 4600
Team Xtreme 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400 Desktop Memory
OCZ ARC 100 ARC100-25SAT3-240G 2.5" 240GB SATA III MLC Internal Solid State Drive
Western Digital WD Blue WD10EZEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
ENERMAX Ostrog GT ECA3280A-BR Black / Red Steel / Plastic ATX Mid Tower Computer Case

Find out what disks are in the system

root@mango:/dev# sfdisk -l

Disk /dev/sda: 29185 cylinders, 255 heads, 63 sectors/track
sfdisk: Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units: cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sda1   *      0+  27135-  27136- 217963520   83  Linux
/dev/sda2      27135+  29185-   2050-  16464897    5  Extended
/dev/sda3          0       -       0          0    0  Empty
/dev/sda4          0       -       0          0    0  Empty
/dev/sda5      27135+  29185-   2050-  16464896   82  Linux swap / Solaris

Disk /dev/sdb: 121601 cylinders, 255 heads, 63 sectors/track

Disk /dev/sdc: 121601 cylinders, 255 heads, 63 sectors/track

root@mango:/dev# lshw -class disk
  *-disk                  
       description: ATA Disk
       product: OCZ-ARC100
       physical id: 0.0.0
       bus info: scsi@0:0.0.0
       logical name: /dev/sda
       version: 1.00
       serial: A22L1061449007331
       size: 223GiB (240GB)
       capabilities: partitioned partitioned:dos
       configuration: ansiversion=5 sectorsize=512 signature=2a960743
  *-disk
       description: ATA Disk
       product: WDC WD10EZEX-00B
       vendor: Western Digital
       physical id: 0.0.0
       bus info: scsi@1:0.0.0
       logical name: /dev/sdb
       version: 1A01
       serial: WD-WCC3F3NFSS65
       size: 931GiB (1TB)
       configuration: ansiversion=5 sectorsize=4096
  *-cdrom
       description: DVD-RAM writer
       product: iHAS124   E
       vendor: ATAPI
       physical id: 0.0.0
       bus info: scsi@3:0.0.0
       logical name: /dev/cdrom
       logical name: /dev/cdrw
       logical name: /dev/dvd
       logical name: /dev/dvdrw
       logical name: /dev/sr0
       version: 4L08
       capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
       configuration: ansiversion=5 status=nodisc
  *-disk
       description: ATA Disk
       product: WDC WD10EZEX-00B
       vendor: Western Digital
       physical id: 0.0.0
       bus info: scsi@4:0.0.0
       logical name: /dev/sdc
       version: 1A01
       serial: WD-WCC3F1CX4JKE
       size: 931GiB (1TB)
       configuration: ansiversion=5 sectorsize=4096

root@mango:/dev# lsblk -f
NAME   FSTYPE LABEL UUID                                 MOUNTPOINT
sda                                                      
├─sda1 ext4         1987feef-7ad1-4e00-8578-9559d8aff148 /
├─sda2                                                   
└─sda5 swap         c17c259d-e3a8-4220-9f0d-9df4af33fa34 [SWAP]
sdb                                                      
sdc                                                      
sr0                                                      

root@mango:/dev# blkid
/dev/sda1: UUID="1987feef-7ad1-4e00-8578-9559d8aff148" TYPE="ext4" PARTUUID="2a960743-01" 
/dev/sda5: UUID="c17c259d-e3a8-4220-9f0d-9df4af33fa34" TYPE="swap" PARTUUID="2a960743-05" 

root@mango:/dev# ls -l /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Jan  4 08:24 1987feef-7ad1-4e00-8578-9559d8aff148 -> ../../sda1
lrwxrwxrwx 1 root root 10 Jan  4 08:24 c17c259d-e3a8-4220-9f0d-9df4af33fa34 -> ../../sda5

==============================================
hostname:mango, os:Ubuntu 14.10 Utopic Unicorn
==============================================
ASRock Z97 Extreme6 LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Intel Core i7-4790 Haswell Quad-Core 3.6GHz LGA 1150 84W Desktop Processor Intel HD Graphics 4600
Team Xtreme 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400 Desktop Memory
OCZ ARC 100 ARC100-25SAT3-240G 2.5" 240GB SATA III MLC Internal Solid State Drive
Western Digital WD Blue WD10EZEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
ENERMAX Ostrog GT ECA3280A-BR Black / Red Steel / Plastic ATX Mid Tower Computer Case

New System 2015

I built a new system this winter break...

==============================================
hostname:mango, os:Ubuntu 14.10 Utopic Unicorn
==============================================
ASRock Z97 Extreme6 LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Intel Core i7-4790 Haswell Quad-Core 3.6GHz LGA 1150 84W Desktop Processor Intel HD Graphics 4600
Team Xtreme 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400 Desktop Memory
OCZ ARC 100 ARC100-25SAT3-240G 2.5" 240GB SATA III MLC Internal Solid State Drive
Western Digital WD Blue WD10EZEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
ENERMAX Ostrog GT ECA3280A-BR Black / Red Steel / Plastic ATX Mid Tower Computer Case

Perforce Client Setup

I got it from here.

1. Export environment variable
$ export P4CONFIG=.p4config

2. Create workspace directory
$ cd /auto/home/delacs/projects/autoselect_feature
$ mkdir code

3. Create p4 config file, name of client will be 'delacs-autoselect-feature'
$ vi .p4config
P4CLIENT=delacs-autoselect-feature
P4PORT=server.domain.com:1666

4. Create the client
$ p4 client

In text editor:
Client: delacs-autoselect-feature
Root:  /auto/home/delacs/projects/autoselect_feature
View: //tools/main/perf/scripts/scheduler/... //delacs-autoselect-feature/code/scheduler/...
      //tools/parser/... //delacs-autoselect-feature/code/parser/...

5. Now, let's pull down code from perforce
$ p4 sync

Get Latest Records SQL

Using this SQL:

SELECT sb1.date, sb1.branch, sb1.build
FROM stable_builds sb1
INNER JOIN (
    SELECT max(date) date, branch
    FROM stable_builds
    GROUP BY branch
) AS sb2
ON sb1.branch = sb2.branch
AND sb1.date = sb2.date
ORDER BY date DESC

Data:
Date Branch Build   
2014-11-24 5.6 460049
2014-11-19 5.6 459641
2014-11-16 5.6 459347

Output:
Date Branch Build   
2014-11-24 5.6 460049

Rails - Separate Seeds Using Seedbank

Seedbank gives your Rails seed data a little structure. Create seeds for each environment, share seeds between environments and specify dependencies to load your seeds in order. All nicely integrated with simple rake tasks. This is how I quickly used it:

1.  Put in Gemfile:
gem "seedbank"

2. Install
$ bundle install

3. Create the specific seed file:
$ vi db/seeds/performance_translations.seeds.rb
translations = [
  ["r-high-0001","1-read high-generation"],
  ["r-high-0008","8-read high-generation"],
  ["r-high-0016","16-read high-generation"]
]
translations.each do |int, ext|
  PerformanceTranslation.find_or_create_by_internal(internal: int, external: ext)
end

4. Run via rake
$ rake db:seed:performance_translations

Schedule rake using cron on rvm environment

Little tricky to get this going. The key is knowing rvm environment.

$ rvm env --path
/auto/home3/delacs/.rvm/environments/ruby-2.0.0-p353@RailsDev

For rvm, basic command line tools like gem, rake and ruby are in the wrappers directory.

$ crontab -l
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
HOME=/auto/home3/delacs
RAILS_ENV=development

0 7 * * * /bin/bash -l -c 'source ~/.bash_profile' && cd $HOME/Documents/projects/monweb_management && $HOME/.rvm/wrappers/ruby-2.0.0-p353@RailsDev/rake perfdb:get_baselines >> $HOME/logs/db.import.log 2>&1

5 7 * * * /bin/bash -l -c 'source ~/.bash_profile' && cd $HOME/Documents/projects/monweb_management && $HOME/.rvm/wrappers/ruby-2.0.0-p353@RailsDev/rake perfdb:get_published_runs  >> $HOME/logs/db.import.log 2>&1