Which RAID is best?

There are many sites with various RAID comparisons on and many more making various claims as to which RAID type is the best for various purposes/fastest/etc.

The 2.5Tb storage partition on my Xen box decided to pack up recently (or at least Xen decided it no longer wanted to read the partition) so after backing up the data decided to run some tests.

Drives: 4x Western Digital RE 1Tb

RAID 5:

This was the original configuration of the array, despite having fast drives in my desktop and 1Gbit network the read speeds were slower than expected (around 35Mb/sec).

The hdparm results were inconsistent:

Timing cached reads: 10118 MB in 2.00 seconds = 5064.59 MB/sec
Timing buffered disk reads: 224 MB in 3.02 seconds = 74.24 MB/sec

Timing cached reads: 10020 MB in 2.00 seconds = 5016.71 MB/sec
Timing buffered disk reads: 148 MB in 3.03 seconds = 48.83 MB/sec

Timing cached reads: 10126 MB in 2.00 seconds = 5068.86 MB/sec
Timing buffered disk reads: 200 MB in 3.03 seconds = 65.94 MB/sec

Timing cached reads: 10086 MB in 2.00 seconds = 5049.90 MB/sec
Timing buffered disk reads: 234 MB in 3.02 seconds = 77.55 MB/sec

Timing cached reads: 10042 MB in 2.00 seconds = 5027.45 MB/sec
Timing buffered disk reads: 210 MB in 3.01 seconds = 69.80 MB/sec

Average over the 5 tests: 67.27 Mb/sec

RAID 10:

As an alternative I switched the array to RAID 10, the downside of this configuration is that there is 1Tb less space than RAID 5.

Timing cached reads: 10170 MB in 2.00 seconds = 5091.34 MB/sec
Timing buffered disk reads: 320 MB in 3.01 seconds = 106.46 MB/sec

Timing cached reads: 10094 MB in 2.00 seconds = 5052.71 MB/sec
Timing buffered disk reads: 316 MB in 3.02 seconds = 104.59 MB/sec

Timing cached reads: 10072 MB in 2.00 seconds = 5041.96 MB/sec
Timing buffered disk reads: 314 MB in 3.01 seconds = 104.29 MB/sec

RAID 10 results are much more consistent.
Average over the 3 tests: 105.11 Mb/sec

RAID 6:

Another configuration offering 2 disk redundancy.

Timing cached reads: 10172 MB in 2.00 seconds = 5091.87 MB/sec
Timing buffered disk reads: 202 MB in 3.01 seconds = 67.06 MB/sec

Timing cached reads: 10052 MB in 2.00 seconds = 5031.76 MB/sec
Timing buffered disk reads: 202 MB in 3.01 seconds = 67.18 MB/sec

Timing cached reads: 10102 MB in 2.00 seconds = 5057.17 MB/sec
Timing buffered disk reads: 206 MB in 3.00 seconds = 68.59 MB/sec

RAID 6 results are also fairly consistent.
Average over the 3 tests: 67.61 Mb/sec

It seams that with this configuration that RAID 5/6 perform at roughly the same speed, however RAID 10 seams to win out on the speed test with over 50% improvement over RAID 5/6.

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RATM vs Pop Shite Update!

According to leaked sales figures for tonight’s chart RATM have beaten X Factor by 50k sales!!!

Here are the figures:

1 KILLING IN THE NAME RAGE AGAINST THE MACHINE 502672
2 THE CLIMB JOE MCELDERRY 450838
3 BAD ROMANCE LADY GAGA 61677
4 THE OFFICIAL BBC CHILDREN IN NEED MEDLEY PETER KAY’S ANIMATED ALL STAR 52605
5 STARSTRUKK 3OH3 FT KATY PERRY 40742
6 YOU KNOW ME ROBBIE WILLIAMS 38435
7 3 WORDS CHERYL COLE 36232
8 RUSSIAN ROULETTE RIHANNA 34094
9 DON’T STOP BELIEVIN’ JOURNEY 33337
10 MEET ME HALFWAY BLACK EYED PEAS 32517
11 TIK TOK KESHA 26571
12 YOU ARE NOT ALONE X FACTOR FINALISTS 2009 24404
13 DOESN’T MEAN ANYTHING ALICIA KEYS 23415
14 DECEMBER SONG (I DREAMED OF CHRISTMAS) GEORGE MICHAEL 22243
15 LET THE BASS KICK IN MIAMI GIRL CHUCKIE & LMFAO 21556
16 MORNING AFTER DARK TIMBALAND/NELLY FURTADO/SOSHY 19687
17 FIGHT FOR THIS LOVE CHERYL COLE 18859
18 FAIRYTALE OF NEW YORK POGUES FT KIRSTY MACCOLL 18457
19 WHATCHA SAY JASON DERULO 18278
20 LOOK FOR ME CHIPMUNK FT TALAY RILEY 17775

Currently from 20 – 12 have been 100% correct!

Update: 11 – 9 are also correct!

Update: 8 – 5 are correct, only 2 more songs till the official result!

Update: No surprises 4 and 3 were correct. 1 song away from the result!!!

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First commercial space craft unveiled by Virgin Galactic

After several years of talk, Virgin have unveiled their commercial space craft the VSS Enterprise! Now we can all go into space for a mere $200,000 a ticket!

091208-virgin-galactic-spaceship-enterprise-branson_big

I pinched the picture from the National Geographic, here is a link to the full story:


Also here is the Virgin Galactic website will more pics and info:


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