Swap partition

Chris Sparks mrada at catalina-inter.net
Sun Dec 14 14:17:43 UTC 2003


I can appreciate this, however, did you do this prior to installing and 
using the hard drive?  I don't
want to move or add swap partititions if "good" data is already present 
there.  How can I check for this?

Chris...

Chris Miller wrote:

>I would just add another swap partition. To give you an idea some of my
>bigweb servers have 4 2gig swap partitions. And that is with 2 – 4 gigs
>of ram. 
>
>What does the box do?
>
>If you are going to do a lot of swapping then you might want to add
>pri=0 to the fstab.
>
>
>Here is what my fstab looks like.
>
>/dev/sda3 swap swap defaults,pri=0 0 0
>
>/dev/sdb2 swap swap defaults,pri=0 0 0
>
>/dev/sda2 swap swap defaults,pri=0 0 0
>
>/dev/sdb3 swap swap defaults,pri=0 0 0
>
>
>With pri=0 swap will be used on all partition at the same time. When you
>do not set pri=0 one swap partition will fill up first then the next and
>so on.
>
>
>But that would be over kill for most people. Only reason I have my swap
>setup that way is due to the way apache locks memory when you have 2000+
>apache processes running.
>
>
>On Sat, 2003-12-13 at 22:16, Chris Sparks wrote:
>  
>
>>Hi Gregory,
>>
>>    
>>
>>>The "easy" thing to do in this case is abandon the miminal swap you have
>>>and just make another (larger) swap partition to be used instead.  The
>>>size of a swap partition is a matter of debate, but generally it sould
>>>be equal to or no more than twice as large as your physical memory.
>>>
>>>      
>>>
>>Since I originally started with 128 MB this makes sense why it suggested 
>>256 MB.  I had to increase
>>the memory to 384 MB because of the boat load of seg faults I was getting.
>>
>>    
>>
>>>If you actually have space on the disk around the swap partition that
>>>you can resize into, there is nothing that prevents resizing the
>>>partition and running "mkswap" on the resized space.  There's no real
>>>magic about swap files/partitions.  Of course, you'll have to resize and
>>>mkswap in "single user mode" with swap disabled while you're
>>>manipulating the system.
>>>
>>>      
>>>
>>My swap is at the end of the hard disk so I would be possible to extend 
>>into it.  Actually I have
>>the boot first, / second, and the swap last.  I just didn't want to 
>>clobber anything on the root disk
>>if I resized into it with the swap.  How does one know if it is safe to 
>>go into those sectors without
>>worry?
>>
>>Also how do I go into single user mode?
>>
>>    
>>
>>>I see your concern about having more than one swap file/partition, but
>>>I'd suggest thtat this isn't really something to worry about.  Swap
>>>space shouldn't be a consideration in normaml operation, and using more
>>>than 1 file/partition should not effect efficiency.
>>>
>>>      
>>>
>>I agree, however, I am still intruding into the root partitition anyway.
>>
>>Chris
>>
>>
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>>
>>    
>>
>
>
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