Correct me where I missed the point - the system allocates 'unused' memory which it gives up when needed. You still have lots of free pages. This an m4000:
As far as I know limiting the zfs cache could make sense because of the overhead associated with the dynamic resizing.
Oracle/Sun consultants recommended the following settings in /etc/system on our database servers with 64G of physical memory:
Code:
* ZFS tuning
set zfs:zfs_immediate_write_sz=8000
set zfs:metaslab_df_free_pct=4
set zfs:zfs_nocacheflush=1
set zfs:zfs_vdev_max_pending=32
* limit zfs 16G
set zfs:zfs_arc_max=17179869184
Are you experiecing problems? Really sluggish performance, lots of swapping?
Actually no. However, I have created other zones on ZFS pools. These zones run Oracle software that looks for available RAM before starting. If there is no RAM available, the software pukes out an error msg and dies.
I'm just looking for ways to get these zones up and running while managing memory effectively. I'm also new at using ZFS and zones so I'm going through a bit of a learning curve too.
As far as I know limiting the zfs cache could make sense because of the overhead associated with the dynamic resizing.
Oracle/Sun consultants recommended the following settings in /etc/system on our database servers with 64G of physical memory:
Code:
* ZFS tuning
set zfs:zfs_immediate_write_sz=8000
set zfs:metaslab_df_free_pct=4
set zfs:zfs_nocacheflush=1
set zfs:zfs_vdev_max_pending=32
* limit zfs 16G
set zfs:zfs_arc_max=17179869184
I was think about setting this limit (16G) on my M5000.
Hi All,
How do we calculate the zfs cache value from Solaris 11.3 ?? I normally use memstat but learnt that is not a good practice. Any other way to get the value ? (2 Replies)
Hi,
kstat -p -m zfs -n arcstats -s size returns
zfs:0:arcstats:size 8177310584
this values is approx (7.61 GB)
but my Physical Memory size is only 6144 Megabytes.
Can this happen ?
if yes, then how can I find free memory on the system.
BTW, I ran the kstat commands from a Non... (2 Replies)
Hi All,
could any one point out any open source test-suites for "File cache" testing and as well as performance test suites for the same. Currently my system is up with Linux/ext4.
Regards
Manish (0 Replies)
Hi All,
I am trying to read zpool.cache file to find out pool information like pool name, devices it uses and all properties.
File seems to be in packed format.I am not sure how to unpack it.
But from opensolaris code base we can see that they have used libz for uncompromising this file, but... (0 Replies)
We are having a server running zfs root with 64G RAM and the system has 3 zones running oracle fusion app and zfs cache is using 40G memory as per
kstat zfs:0:arcstats:size. and system shows only 5G of memory is free rest is taken by kernel and 2 remaining zones.
Now my problem is that... (2 Replies)
Hi all
I saw in Microsoft web site www.SysInternals.com a tool called CoreInfo from able to print out on screen the size of the Data and Instruction caches of your processor, the Locigal to Physical Processor mapping, the number of the CPU sockets. etc..
Do you know if in Linux is available a... (2 Replies)
Dear all,
We are testing two of our servers for mq series connectivity. The scenario is, when one machine is shutting down it's services there are some scripts that do a dns update, which removes the ip address and relates it to the ip address of the other node on our dns server, and the update... (7 Replies)
hi,
What is the difference between UBC cache and Metadata cache ? where can i find UBC cache Hits and Metadata cache Hits in hp-ux?
Advanced thanx for the help. (2 Replies)