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Operating Systems AIX Defining LV's with the Interpolicy Maximum option Post 302831371 by hariza on Wednesday 10th of July 2013 09:11:04 PM
Old 07-10-2013
Thanks Guys I really appreciate your valuable comments. The reason behind my posting was because we had a while ago an IBM expert doing some work with the Midrange/Storage team and according to him and what he has seen across different customer sites is that by implementing PP striping has made a big difference in performance. As you guys mentioned in your posts nowdays we have plenty of cache almost at every single level (lpar,storage subsystem) and stripping might not help as it used to do it in the past.

In our case when it comes to achieve better performance for databases we try to avoid double buffering by bypassing the filesystem cache hence making the filesystem cache smaller and that extra memory can be allocated by the Oracle SGA. On AIX we rely heavily on Concurrent I/O. Once Concurrent I/O is on Direct reads/writes are mostly used by the database and locking issues caused by inode locking on a heavily updated systems are a thing of the past. Having said this we have seen performance improvements by allocating different LUN's sizes (33/100/500 Gigs) depending on the system (OLTP,DSS) and adjusting QDEPTH. We have seen single LUN achieve more than 3000 IOPS. We'll be performing Performance and Volume test and it would be insteresting to see the results using different types of secenarios.

Thanks Guys....
 

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CACHEINFO(5)							AFS File Reference						      CACHEINFO(5)

NAME
cacheinfo - Defines configuration parameters for the Cache Manager DESCRIPTION
The cacheinfo file defines configuration parameters for the Cache Manager, which reads the file as it initializes. The file contains a single line of ASCII text and must reside in the /etc/openafs directory. Use a text editor to create it during initial configuration of the client machine; the required format is as follows: <mount>:<cache>:<size> where <mount> Names the local disk directory at which the Cache Manager mounts the AFS namespace. It must exist before the afsd program runs. The conventional value is /afs. Using any other value prevents traversal of pathnames that begin with /afs (such as pathnames to files in foreign cells that do use the conventional name). The -mountdir argument to the afsd command overrides this value. <cache> Names the local disk directory to use as a cache. It must exist before the afsd program runs. The standard value is /usr/vice/cache, but it is acceptable to substitute a directory on a partition with more available space. Although the Cache Manager ignores this field when configuring a memory cache, a value must always appear in it. The -cachedir argument to the afsd command overrides this value. <size> Specifies the cache size as a number of 1-kilobyte blocks. Larger caches generally yield better performance, but a disk cache must not exceed 90% of the space available on the cache partition (85% for AIX systems), and a memory cache must use no more than 25% of available machine memory. The -blocks argument to the afsd command overrides this value. To reset cache size without rebooting on a machine that uses disk caching, use the fs setcachesize command. To display the current size of a disk or memory cache between reboots, use the fs getcacheparms command. EXAMPLES
The following example cacheinfo file mounts the AFS namespace at /afs, establishes a disk cache in the /usr/vice/cache directory, and defines cache size as 50,000 1-kilobyte blocks. /afs:/usr/vice/cache:50000 SEE ALSO
afsd(8), fs_getcacheparms(1), fs_setcachesize(1) COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved. This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell. OpenAFS 2012-03-26 CACHEINFO(5)
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