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тАО06-23-2010 06:49 AM
тАО06-23-2010 06:49 AM
ASM Allocation Unit size and storage waste
The bottom line is for flash logs, out of 4.77 TB allocated, only 3.01 TB is actually in use, wasting 1.71 TB which we could really use...
What are other implementations using for their AU_SIZE? Has anyone explored using an AU_SIZE smaller than the default 1 MB. I've seen recommendations for a 4 MB size for some systems. Thanks.
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тАО06-23-2010 10:27 AM
тАО06-23-2010 10:27 AM
Re: ASM Allocation Unit size and storage waste
Pretty good summary article on ASM and AU_SIZE:
http://www.remote-dba.net/t_11g_new_asm_performance.htm
>>> note the last paragraph at the end re: redo logs, which in my mind, somewhat parallel flash back areas, at least in the cut/slice utility of them, much more so than a regular db file:
---------------------------
By using fine grained striping for redo log files, a lower latency is reached because smaller units get distributed across all disk members of an ASM disk group. Oracle uses AUs as stripes for files in ASM storage and spreads a file in an ASM disk group across all disks in a fail group. So now there is striping within a fail group and mirroring across the fail groups within a disk group. By using coarse striping for datafiles, Oracle achieves load balancing of read write operations across all disks within a disk group.
------------------
above from "ASM Performance Enhancements in Oracle 11g" - Burleson
FWIW - Burleson always has good books on Oracle topics. Never seen a bad one, and I've purchased a number of them over the years.
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тАО07-08-2010 09:54 AM
тАО07-08-2010 09:54 AM
Re: ASM Allocation Unit size and storage waste
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тАО08-10-2010 08:46 AM
тАО08-10-2010 08:46 AM
Re: ASM Allocation Unit size and storage waste
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тАО08-11-2010 01:21 PM
тАО08-11-2010 01:21 PM