From everything that you have shown us, you are now happy that access to ZFS filesystems will be slower than they were before. Before you limited ZFS's use of free memory, it was using lots of free memory as a disk cache. Now, you have lots of free memory that is free, but can't be used by ZFS.
Before you made this change and when the databases were running, you had less free memory. Why is that a problem? Was it causing a lot of swapping?
Why buy 64GB of memory if your goal is to keep 49GB free (i.e., unused)?
If Oracle is unable to allocate 32 bytes, the problem is likely to be that the "oracle database thread size was set to 4 Gb"; not that the ZFS buffer cache size has been restricted.
From everything that you have shown us, you are now happy that access to ZFS filesystems will be slower than they were before. Before you limited ZFS's use of free memory, it was using lots of free memory as a disk cache. Now, you have lots of free memory that is free, but can't be used by ZFS.
Before you made this change and when the databases were running, you had less free memory. Why is that a problem? Was it causing a lot of swapping?
Why buy 64GB of memory if your goal is to keep 49GB free (i.e., unused)?
this machine has only 2 zones, application and database. when the memory issue was there, application pages was not loading and they were keep on complaining about the system. and team used to reboot full server every week to resolve this issue.
i am not sure about issue faced before this settings. only thing from mbd i can see like 45 GB memory was used by zfs cache.
---------- Post updated at 02:15 PM ---------- Previous update was at 02:09 PM ----------
Quote:
Originally Posted by Don Cragun
If Oracle is unable to allocate 32 bytes, the problem is likely to be that the "oracle database thread size was set to 4 Gb"; not that the ZFS buffer cache size has been restricted.
They cannot assign the memory to oracle after the zfs arc line in /etc/system and there is a lot of free memory during that operation ?
If so, take a look how that user is setuped, especially projects. Solaris uses projects to impose various limits to users projects -l
What is your SGA ?
Are you running your database as a user ? (oracle?)
Are you using zfs filesystems for your database or ASM ?
Zones also have a limit system regarding memory and cpu which is defined in zone configuration file.
This is fairly well documented on oracle site regarding setup of solaris OS for oracle database (global and non-global zones).
Numbers in that documentation are subject to your environment needs.
For instance, in documentation parameter project.max-shm-memory is
4294967295 which is equivalent to 4 GB. This parameter should probably be increased in real life scenario to much higher value (again, depending on your workload, but looks like the errors are coming from there...)
As you might notice, me, as well as others, are guessing
That is not nice from your side, and time consuming from ours.
They cannot assign the memory to oracle after the zfs arc line in /etc/system and there is a lot of free memory during that operation ?
If so, take a look how that user is setuped, especially projects. Solaris uses projects to impose various limits to users projects -l
What is your SGA ?
Are you running your database as a user ? (oracle?)
Are you using zfs filesystems for your database or ASM ?
Zones also have a limit system regarding memory and cpu which is defined in zone configuration file.
This is fairly well documented on oracle site regarding setup of solaris OS for oracle database (global and non-global zones).
Numbers in that documentation are subject to your environment needs.
For instance, in documentation parameter project.max-shm-memory is
4294967295 which is equivalent to 4 GB. This parameter should probably be increased in real life scenario to much higher value (again, depending on your workload, but looks like the errors are coming from there...)
As you might notice, me, as well as others, are guessing
That is not nice from your side, and time consuming from ours.
Hi all
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06-21-2015
