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Date: Fri, 16 Nov 2012 21:38:09 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Gary Aitken <freebsd@dreamchaser.org>
Subject: Re: 9.0 crash, ssd or filesystem problem?
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On Fri, 16 Nov 2012, Gary Aitken wrote:

> On 11/16/12 12:10, Warren Block wrote:
>
>> Additional SSD suggestions: when creating partitions, leave out the swap
>> partition.  If you have lots of memory, leave out the /tmp partition. Add
>> that extra space to the /usr partition.
>>
>> Format the UFS filesystems with -Ut, for soft updates and TRIM support.
>> (Make sure your SSD supports TRIM, almost all do.)  (I don't use soft
>> updates journaling.)
>>
>> Use dd(1) to make a zero-filled file on /usr somewhere, say /usr/swap.
>> Make it the size you want swap to be, and do not make it a sparse file.
>> Tell the system to use the swapfile in /etc/rc.conf:
>>
>>    swapfile="/usr/swap"
>>
>> Use tmpfs for /tmp in /etc/fstab:
>>
>>    tmpfs        /tmp    tmpfs    rw,mode=01777    0    0
>>
>> It's possible to limit the size, but not necessary.  This /tmp will be
>> cleared on reboot.
>
> Not necessary because it is constrained by the swap file size?

Yes, but also because /tmp usually doesn't need much space.  On this 
desktop system, du shows all of /tmp is only 52K.