Computer Hardware

Dell Perc6/i RAID Monitoring Script using MegaCli (LSI) on CentOS 5.2 - 64 bits

I got a Dell Perc6/i Integrated RAID card a few days ago. By using it with CentOS 5.2 64 bits without GUI, I'm looking the way to monitor RAID status. I then, found that I can use MegaCLI from LSI to do the task. (Dell Perc6/i uses LSI Chip)

First, get MegaCLI from LSI website -> MegaCLI 2.00.11 for Linux

RAID 10 is not equal to RAID1+0

I just ran into a document stating that RAID 10 is not equal to RAID1+0 . Below is what she said :

There is little documentation on Linux's RAID 10, or how it differs from RAID 1+0. Fortunately, some readers passed on some good information on what RAID 10 is, and what sets Linux's implentation apart. First of all, never mind that everyone says that RAID 10 and 1+0 are the same thing and that even man md says this — they're not the same. RAID 10 is a new type of array; it is a single array, it can have an odd number of drives, and the minimum required are two. RAID 1+0 is a combination of multiple arrays, it requires at least four disks, and must always have an even number.

Below is the comparison:

Linux RAID 10 needs a minimum of two disks, and you don't have to use pairs, but can have odd numbers. You can read all about it in Resources, so I'll sum up the basic differences:
    * RAID10 provides superior data security and can survive multiple disk failures
    * RAID10 is fast
    * RAID10 is considerably faster during recovery— RAID5 performance during a rebuild after replacing a failed disk bogs down as much as 80%, and it can take hours. RAID10 recovery is simple copying.
    * RAID5 is susceptible to perpetuating parity and other errors

Promise Technology NAS SmartStor NS4300N - Permission Problem

I got Promise Technology SmartStor NS4300N Network Attached Storage (NAS) for many months ago but didn't really use it until I found out that there is a permission problem with it. Since I got it, I just moved all of my files and folders inside one folder on NAS. (Let's say "Temp") A few days later, I created some other blank folders at the same level as “Temp” folder and set some permission for different people. My plan is to organized all files and folder under “Temp” sometime soon.

Last month, I started to organize my files and folder. Before that, I found that there was a new firmware came out. So, I just upgraded firmware from 01.02.0000.05 to 1.03.0000.06. Started to move files from “Temp” folder to other folders but I ran into permission problem on many files and folders. This is strange but I found that the problem is about Owner of those files and folders were different. I had to change owner under FTP program. (CHOWN) Since there were a lot of files and folders I had to go through, I finally gave up.

I've contacted Promise Support and they answered me that there was no known problem about permission with this new firmware. I also asked him if it’s possible to get into SSH but he said there was no way to do that. (But I found a way later on this website and this one but I never tried that though.) They asked if I can try to refresh permission under web interface and see if it is solved or not. I replied back to ask if he can tell me step by step how to do that. Never get answer back from them ever since.

I, then, found this link -> http://forums.dpreview.com/forums/read.asp?forum=1023&message=25115423 - Here is what creaturejbl said :

Their answer - Yes, this is a well know bug on permission control. They suggest me just return the product to store.

OLPC XO laptops publicly available today

Beginning today, anyone interested in getting an XO computer through the One Laptop Per Child (OLPC) program has a chance to grab one. The Give One, Get One (G1G1) program is open to US and Canadian residents who want to purchase one XO laptop for themselves for $399.

Order between today and November 26, and you'll receive one of the green and white laptop computers. The other will be sent on your behalf to a child in a developing nation. US donors will also receive free access for one year to T-Mobile wireless hotspots located throughout the country.

Seagate warns of infected drives

Seagate is warning users to scan their systems for malware after a password-stealing Trojan was found on some of its hard drives. The vendor said that the malware was discovered on the Maxtor Basics Personal Storage 3200 model by researchers from security firm Kaspersky. Seagate did not reveal how many infected drives had been sold, claiming only that it was "a small number".

computer turned off by itself. No picture on monitor

I just got back a computer that I assembled for my friend half a year ago. At that time, his motherboard went bad. So, I just replaced a new ASROCK motherboard that has most components build-in. (VGA, LAN, Sound) It was the last motherboard brand/model I could find in the market at that time since it's for Pentium 4 Socket 478. (I usually goes for Intel chipset after I found a lot of problem when working with SiS or VIA chipset.) All work well until a couple days ago. I got a call from my friend said that the computer shut down by itself twice. Later on, he tried to turn on the computer.

Problem with DVR Cards

Last week, I spent almost a week just to try to figure it out how to make DVR cards work with my computer. Since I found that there are a lot of DVR cards (Digital Video Recorder cards???) available in the market. Most of them can only work with Pentium-4 computer system. The problem is that it's quite difficult to find a new computer that has Pentium-4 in it. I called many resellers just to ask them if their cards can work with newer computer system such as Celeron-D, Pentium-D, etc. One reseller said anything with Intel chipset motherboard and ATI display adapter will work.

Sound Driver for Vista - HP Notebook, Conexant (Waikiki)

It took HP many months after Windows Vista is official release to get a beta sound driver for Conexant Waikiki chipset to work. If anyone looks for it, just check this forum -> http://forum.notebookreview.com/announcement.php?f=3&a=15

To check if you have Conexant Waikiki or Venice chipset. Check hardware ID in device manager. If it shows DEV_5047, then, you got Waikiki chipset, if it's DEV_5045, then, you got Venice chipset.

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