Problems Regarding SQL Server Installation

Posted on 2000-02-15
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?
Question by:ShehzadMunir

Expert Comment

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.


Expert Comment

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...

Author Comment

ID: 2529952
Thanks a lot. It helped me out.
Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.


Expert Comment

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


Author Comment

ID: 2545496
Adjusted points to 20

Expert Comment

ID: 2547817
ungrateful bastard?

(i'm a non-english speaking:-))

Accepted Solution

vujos earned 20 total points
ID: 2558090

Some starting points :

1) Disk Caching Controller is hardware
   tahat is usaly used in combination  
   with RAID controllers (like
   many more).

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

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.

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
SQL Server - TSQL - Removing duplicates/How to get max records per id 13 46
SQL Query 2 31
First Max value 3 28
MS SQL query to show nearest date 6 35
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
Via a live example, show how to set up a backup for SQL Server using a Maintenance Plan and how to schedule the job into SQL Server Agent.

856 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