Solved

Problems Regarding SQL Server Installation

Posted on 2000-02-15
7
215 Views
Last Modified: 2012-05-04
It is recommended that while installation of SQL Server if there is any "Disk Caching Controller" then disable it.

First I don't understand this  "Disk Caching Controller" , Do they talk from Hardware perspective or from Sodftware Perscpective.

Also I want to know about this  "Disk Caching Controller" in detail if possible.

If there is any site?
0
Comment
Question by:ShehzadMunir
7 Comments
 
LVL 9

Expert Comment

by:david_levine
ID: 2522447
The reason is most likely because SQLServer has it's own caching and wants to protect you in case of a failure. If for some reason, you have a disk failure or loss of power between when SQLServer thinks it physically wrote something to disk and the disk caching controller wrote something, you could lose those changes to the database.

Not a real big concern though so don't sweet it that much.

David
0
 
LVL 1

Expert Comment

by:vandamme
ID: 2524314
Usually, a "Disk Caching Controller" is referring to Hardware.  When applications write to your hard drive, these controllers try to optimize your write time by holding the information in a cache until it has a full page\sector\(whatever) to write.  This helps your I/O, but if you lose power you lose any data in this cache.  That's why SQL Server wants you to turn it off.  It includes mechanisms which keep track of what data is actually written to the drive.  The two could interfere with each other, and cause data loss.  That's why they want you to disable it.  But like David said, it's no big deal, especially if you keep current backups which all "GOOD" DBAs do...
0
 

Author Comment

by:ShehzadMunir
ID: 2529952
Thanks a lot. It helped me out.
0
Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 
LVL 9

Expert Comment

by:david_levine
ID: 2530923
So give one of us the points so the question is closed out.

David
0
 

Author Comment

by:ShehzadMunir
ID: 2545496
Adjusted points to 20
0
 
LVL 4

Expert Comment

by:wqw
ID: 2547817
ungrateful bastard?

(i'm a non-english speaking:-))
0
 
LVL 1

Accepted Solution

by:
vujos earned 20 total points
ID: 2558090
Hi,

Some starting points :

1) Disk Caching Controller is hardware
   tahat is usaly used in combination  
   with RAID controllers (like
   MYLEX, SERVERRAID, ADAPTEC, DPT and
   many more).

2) Quality of Disk Caching Controller
   is measured in quality of Caching
   algoritam and quantity of on board
   RAM.

3) One of the parameters to look for (
   in the database world is battery
   backup). If database server app
   writes data to the disk (via cache
   controller without battery backup)
   data is stored  initialy
   in the controller memory,and not
   physically written on to the
   disk. If the failure of the hardware
   heppened in that moment data loss
   and logical incosistency will occur.

4) In order to avoid this select
   /DISK controller that does not
   have caching controller built in
   or in the controller setting
   disable ("Write Back") cache and
   enable ("Write Trough") mode.

Good reading for this also Microsoft SQL Server Administrators Companion on the page 766 and 767 under "Error 605".

Hope this is the complete answer.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to share SSIS Package? 6 37
Refresh Dev server with Production database 8 29
Get the latest status 8 32
Sql Server group by 10 29
When you hear the word proxy, you may become apprehensive. This article will help you to understand Proxy and when it is useful. Let's talk Proxy for SQL Server. (Not in terms of Internet access.) Typically, you'll run into this type of problem w…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question