List of people twittering about the clashes in Egypt

Blog post last updated 18:14 GMT,29.january 2010

This is a manually updated list of people twittering about the clashes that have now spread to Egypt

Note: please comment if you miss anybody/anything here.

Twitter accounts updated within the last hour:
lars_akerhaug, Lars Akerhaug, norwegian Journalist from VG.no in Cairo
AJEnglish, Al Jazeera in english, tweets about it
cnnbrk, CNN Breaking News, tweets breaking events
exiledsurfer, tweets about it
acarvin, tweets about it
data4all, tweets about it
SultanAlQassemi, tweets about it
Dany_k, (re)tweets about it
bencnn, tweets from Egypt
shmpOngO, (re)tweets about it
liamooo, tweets about it

Twitter accounts updated within the last three hours:
n/a

Twitter accounts updated later:
RHelmii, tweets about it
xenijardin, tweets about it

Hashtags:
#egypt
#jan25

Fix: Windows won`t download Windows Update updates

I have noticed some Windows machines refusing to download Windows Update packages and simply failing the download with little to no information about why.

I tricks i found that works for me is to first stop WuAuServ:

net stop WuAuServ

Then delete the folder:

%windir%SoftwareDistribution

Start up again the WuAuServ service:

net start WuAuServ

And running Windows Update again.

howto: Create a RAID6 with mdadm

Note: This guide discusses RAID6 but the same will work for a RAID5,  the only difference is that RAID6 uses two disks for parity data while RAID5 only uses one disk.

1) Make sure that all the hard drives you are going to use is connected and available.

I will use the drives /dev/sdb to/dev/sdi in this example.

root@ubuntu:/home/thu# ls -l /dev/sd*
brw-rw—- 1 root disk 8,   0 2011-01-05 21:47 /dev/sda
brw-rw—- 1 root disk 8,   1 2011-01-05 21:47 /dev/sda1
brw-rw—- 1 root disk 8,   2 2011-01-05 21:47 /dev/sda2
brw-rw—- 1 root disk 8,   5 2011-01-05 21:47 /dev/sda5
brw-rw—- 1 root disk 8,  16 2011-01-05 21:47 /dev/sdb
brw-rw—- 1 root disk 8,  32 2011-01-05 21:47 /dev/sdc
brw-rw—- 1 root disk 8,  48 2011-01-05 21:47 /dev/sdd
brw-rw—- 1 root disk 8,  64 2011-01-05 21:47 /dev/sde
brw-rw—- 1 root disk 8,  80 2011-01-05 21:47 /dev/sdf
brw-rw—- 1 root disk 8,  96 2011-01-05 21:47 /dev/sdg
brw-rw—- 1 root disk 8, 112 2011-01-05 21:47 /dev/sdh
brw-rw—- 1 root disk 8, 128 2011-01-05 21:47 /dev/sdi

2) Ask mdadm to create the RAID

root@ubuntu:/home/thu# mdadm ––create /dev/md0 ––level=6 ––raid-devices=8 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi

mdadm: array /dev/md0 started.

Note –level and –raid-devices followed by a list of all the drives to use in the RAID.

3) Create a file system for the RAID device

root@ubuntu:/home/thu# mkfs.ext3 /dev/md0
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=16 blocks, Stripe width=96 blocks
1966080 inodes, 7864224 blocks
393211 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

And you will now be able to mount the device and start using it 🙂

4) Check that the RAID is being built in the background.

Note that the construction will restart every time you restart your server unless it has completed, so please do not reboot unless necessary 🙂

You can check the status of the RAID through two ways:

root@ubuntu:/home/thu# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdi[7] sdh[6] sdg[5] sdf[4] sde[3] sdd[2] sdc[1] sdb[0]
31456896 blocks level 6, 64k chunk, algorithm 2 [8/8] [UUUUUUUU]
[====>…………….]  resync = 20.0% (1050880/5242816) finish=4.5min speed=15392K/sec
root@ubuntu:/home/thu# mdadm ––detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Wed Jan  5 22:03:27 2011
Raid Level : raid6
Array Size : 31456896 (30.00 GiB 32.21 GB)
Used Dev Size : 5242816 (5.00 GiB 5.37 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Jan  5 22:06:15 2011
State : active, resyncing
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Chunk Size : 64K
Rebuild Status : 54% complete
UUID : d09dd686:b5f57b0b:e368bf24:bd0fce41 (local to host ubuntu)
Events : 0.10
Number   Major   Minor   RaidDevice State
0       8       16        0      active sync   /dev/sdb
1       8       32        1      active sync   /dev/sdc
2       8       48        2      active sync   /dev/sdd
3       8       64        3      active sync   /dev/sde
4       8       80        4      active sync   /dev/sdf
5       8       96        5      active sync   /dev/sdg
6       8      112        6      active sync   /dev/sdh
7       8      128        7      active sync   /dev/sdi