Re: Forum suggestion - System Admin Discussion Boards

Jun Du15-May-09 7:23

15-May-09 7:23

Hi,

I have got some questions about RAID1 and RAID5 hardware solutions. For example, I implemented RAID1 as disk mirroring in Windows Server 2003. How do I test this disk mirroring in action in the real world? Does it mean if one hard drive has failed, the system will continue to operate on the mirrored drive? Or when one hard drive has failed, the system will fail but one can reboot the system to the mirrored drive?

Similarly, if I implement a RAID5 using 3 disks, what does it really do? Does it support failover, data redundancy or both? How does RAID5 achieve it?

Best,
Jun

Re: What do RAID1 and RAID5 really mean?

Sebastian Schneider15-May-09 12:38

Sebastian Schneider

15-May-09 12:38

You can test disk mirroring by trashing one of the drives. If they are hot-swapable, just yank one out and put in a new, empty disk. The system will continue to operate during all this, though possibly slower than usual during the rebuild.

RAID-5 with three disks:
Basically, it writes 1 sector to disk 1, 1 sector to disk 2, then checksum of the two sectors to disc 3. The steps are repeated, but the checksum is always written to a different disk. That way, two disks are enough to rebuild the array, it does not matter which disk failed, AND it ofers speed advantages compared to RAID-1.

RAID as such does not offer failover. All disks are in use all the time. However, some RAID-cases have hot-standby-disks, which automatically replace failed ones, in order to keep the window of vulnerability as short as possible.
There also is no real data redundancy: If you accidentally delete something, its lost.

RAIDs only increase uptime and, to a certain amount, throughput.

And now my significant other has entered the room and ordered me to stop typing.

So long.

Cheers,
Sebastian

--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton

How to get machine certificate and user license.

deadlyabbas12-May-09 20:59

deadlyabbas

12-May-09 20:59

I am working on AD RMS so can u plz tell me that how to get the machine certificate and
how to get the User License and How to get RAC(Rights Account Certificate)
PLease tell me that what is needed the first.

error code TF 220066 in VS 2008 Team Foundation server installation

deadlyabbas11-May-09 19:13

deadlyabbas

11-May-09 19:13

TF 220066 An error accured while the setup porogram was an opening a connectionto the data base on the
Team Foundation Data-tier server.Verify that the name of server is correct and that a firewall
or other network connectivity issue is not blocking network traffic. Click next to try again. For more information about
this error, see the installation logs. For the more information about the logs, " Troubleshooting installation for Team Foundation"
in the Foundation installation Guide.

Installation Of software,

Visual Studio 2008 Server Prof.
Inbuilt Installation : Slq Server 2005 Express Edition.

IP of msn or yahoo chatter

Tauseef A9-May-09 9:04

Tauseef A

9-May-09 9:04

hi
can we know the ip address of msn or yahoo chatter without sending or receiving file
thanks in advance
regards

Tauseef A Khan
MCP Dotnet framework 2.0.

OWA does not display properly.

misCafe8-May-09 18:18

misCafe

8-May-09 18:18

Dear All,

I've searched online many days but no luck.
When I log in my owa, everything do not display correctly. It does not display the icon but shows the red cross (like it doesn't find the image icon).

Any help!

Chuon Visoth
Angkor Wat - Cambodia
asp.net - c sharp beginner

Forum suggestion [modified]

Mustafa Ismail Mustafa7-May-09 21:13

Mustafa Ismail Mustafa

7-May-09 21:13

If I have questions regarding networking and infrastructure, where would I post such questions?

Because of being pestered and pressured into asking "the damned question" (;)), I'll state it explicitly.

I have a w2k3 server with 2 NICs, with addresses: 192.168.1.30 (LAN) & 192.168.1.32 (WAN), now, previously I was using a router which was assigning the rest of the addresses on the network using DHCP and in fact it was the default gateway to connect to the internet. The same server doubles up as a DNS and DC server on 192.168.1.30

Configuring DHCP doesn't seem to be an issue, its setting up ISA server that's proving to be a PITA. Local host can use the internet, but not any of the other computers on the network. Indeed, they can't ping any other computer, even the DNS server. Suggestions on where to start to diagnose and fix this?

If the post was helpful, please vote!

Current activities:
Book: The Gods Themselves by Isaac Asimov
Project: Hospital Automation, final stage
Learning: Image analysis, LINQ

Now and forever, defiant to the end.
What is Multiple Sclerosis[^]?

modified on Friday, May 8, 2009 6:54 AM