How to choose the size of swap?

[Brooks Davis]

On Sun, Dec 05, 2010 at 07:53:04PM +0100, Ronald Klop wrote:
> On Sun, 05 Dec 2010 19:20:41 +0100, Vladislav V. Prodan 
> <universite at ukr.net> wrote:
> 
>> We have several servers with 8|16 GB of memory, 2|4 harddrive
>> (RAID1|RAID10 using ZFS)
>> These servers will work with Mysql, the size of databases that are
>> several times larger than the size of memory.
>> 
>> What would recommend to expose the size of swap?
>> On a separate partition or a file?
>> At hand is not loaded with servers that have the swap was over 20 MB ...
>> In an extreme case, let the output "top v" to this maillist
> 
> You might not need swap to run the database. But the swap space is also 
> used for making a kernel dump in case of a problem. In that case swap space 
> must be as large as the amount of memory in the machine. (As far as I 
> know.)

With minidumps (the default) you'll need much less that physical memory
in general.  In most cases 2GB should be more than enough for dumps.

-- Brooks
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