Both Exchange 5.5 and Exchange 2000 use 4KB pages to store data in the Exchange database. There are very few Exchange database related files that are "small" An empty Exchange database file is 1 to 2 MB and a typical size of an Exchange database file is well over 10GB. Exchange transaction logs are always 5MB, regardless if they are full or not. The smallest Exchange database file that would reside on a filer is the Check Point file, which is 8KB.

Regards, Mike Mankovsky Network Appliance Inc.

-----Original Message----- From: Steve Losen [mailto:scl@sasha.acc.virginia.edu] Sent: Monday, November 06, 2000 6:48 AM To: toasters@mathworks.com Subject: Re: Exchange 2k

Waste of space? Maybe. NetApp uses 4K blocks so if you have lots of really small files <4K then you'll waste quite a bit of space.

Supak

All files potentially waste space, regardless of size. With a block size of 4k, you can expect each file to waste an average of 2k. A 17k file uses 5 blocks (20k) of which 3k is wasted. A 15k file uses 4 blocks (16k) of which 1k is wasted. So the amount of storage wasted is roughly the number of files multiplied by 2k bytes. Divide this by the total disk space used to get the percentage of space wasted. I just checked one of our volumes that contains user home directories. It has 3680867 files and 146203264K used, which means about 5% is wasted.

Steve Losen scl@virginia.edu phone: 804-924-0640

University of Virginia ITC Unix Support