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Best disk allocation unit size for SQL Server?
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p_m_hegt  
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 More options Jun 23 2000, 3:00 am
Newsgroups: microsoft.public.sqlserver.server
From: p_m_h...@hotmail.com
Date: 2000/06/23
Subject: Best disk allocation unit size for SQL Server?
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Suppose you have a <big>big<big> Microsoft SQL Server 7 database and
suppose you put the data and the log on different drives (for
reliability and performance). What is the best allocation unit size to
format the drives with for the data drive and the log drive
respectively? I've read that SQL server uses blocks of 8K and does a
read-ahead of 64K, and the log is read and written in 32K blocks. So is
the best allocation unit size for the data drive 8K or 64K and for the
log drive 32K or is some other value better? (Note: assume that no
other stuff is stored on the drives).

Regards, Peter

Sent via Deja.com http://www.deja.com/
Before you buy.


 
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David K. Brown  
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 More options Jun 23 2000, 3:00 am
Newsgroups: microsoft.public.sqlserver.server
From: "David K. Brown" <nosp...@nothing.com>
Date: 2000/06/23
Subject: Re: Best disk allocation unit size for SQL Server?
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I asked someone at Microsoft the very same question.  I was told that 64K
was the ideal size for allocation units for data drives.  Unfortunately,  he
didn't tell what the ideal size for the log drives.

David Brown


 
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Neil Pike  
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 More options Jun 25 2000, 3:00 am
Newsgroups: microsoft.public.sqlserver.server
From: Neil Pike <100577....@compuserve.com>
Date: 2000/06/25
Subject: Re: Best disk allocation unit size for SQL Server?
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 Peter - I've never seen any measurable difference and leave it at NTFS
defaults.

 > Suppose you have a <big>big<big> Microsoft SQL Server 7 database and

> suppose you put the data and the log on different drives (for
> reliability and performance). What is the best allocation unit size to
> format the drives with for the data drive and the log drive
> respectively? I've read that SQL server uses blocks of 8K and does a
> read-ahead of 64K, and the log is read and written in 32K blocks. So is
> the best allocation unit size for the data drive 8K or 64K and for the
> log drive 32K or is some other value better? (Note: assume that no
> other stuff is stored on the drives).

> Regards, Peter

> Sent via Deja.com http://www.deja.com/
> Before you buy.

 Neil Pike MVP/MCSE.  Protech Computing Ltd
 (Please reply only to newsgroups)
 SQL FAQ (484 entries) see
 forumsb.compuserve.com/gvforums/UK/default.asp?SRV=MSDevApps (faqrtf.zip - L7
- SQL Public)
 or www.ntfaq.com/sql.html
 or www.sql-server.co.uk
 or www.mssqlserver.com/faq

 
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