[SunHELP] a question

Fri Aug 27 09:26:07 CDT 2004

Me think me wrote this yesterday but after working a 12 hour shift at the
NYSE me forgets so here goes again

Unix in general is is protected now in a very interesting way, if you run a
process as any user (not UID 0) there is (I believe) 8% reserved, this 8%
will not even whow up when using the df command, so for instance, if I had a
100 gig array and I run df I would see that my / only has 92 gigs capacity.
No you don't lose the other 8% it is reserved for UID 0 just in case a proc
fils up the slice, root will always be able to login. But keep in mind that
(lets say) as user admin you run a " wget -m  www.cnn.com " and don't
monitor it, you will fill up the partition that the pwd is in. once it is
full apache will only run a single process the originating root process, and
apache will not start any child processes to serve sites. No the server will
probably not "crash" but only root will be able to initiate new connections.
Once the slice is full if you type df -h you will see something similar to 
Filesystem            Size   Used  Avail Use% Mounted on
/d0t0d1s0             114G   -6G   120G  100% /

Hope that helps

-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org] On
Behalf Of Michael Horton
Sent: Friday, August 27, 2004 10:09 AM
To: 'The SunHELP List'
Subject: RE: [SunHELP] a question

this situation has changed and the standard from sun has changed with
it.
while in the old days this was certainly true, what sun training, sun
support, and our sun service provider tells us is that it is no longer
required.
while working on solaris, sun made changes to increase the reliability
of the os.

if you check the filesystem changes (mentioned in a previous post), you
will seen one of the changes.

-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org]
On Behalf Of Steve Rieger
Sent: Friday, August 27, 2004 10:04 AM
To: 'The SunHELP List'
Subject: RE: [SunHELP] a question

It is not advisable to only create one / partition, if your logs, or
mysql databases, or anything else for that matter starts creating large
files (and you dud not set any quotas) the / partition would fill up and
no new processes will be started, 

-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org]
On Behalf Of Michael Horton
Sent: Friday, August 27, 2004 9:01 AM
To: 'The SunHELP List'
Subject: RE: [SunHELP] a question

"/" = the root directory.
   this partition would contain
       /, /usr, /opt, /home, /export, /bin, /var, /tmp

a "swap" = the swap partition

example: 18GB hard drive would have 

     c0t0d0s0 = 16gb mounted on "/"
     c0t0d0s1 = 2gb used as swap

most workstation installs have a rather large /export/home when sun
configures them. if your machine is an application server, a separate
/export/home is unncessary. if your machine hosts home directories, a
separate /export/home or nfs mounts would probably be useful.

-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org]
On Behalf Of Grindell, Joan M.
Sent: Friday, August 27, 2004 7:20 AM
To: 'The SunHELP List'
Subject: RE: [SunHELP] a question

i not sure what you mean by 'a / and a swap for disks'.

many thanks
Joan

-----Original Message-----
From: Michael Horton [mailto:Michael.Horton at acntv.com]
Sent: Thursday, August 26, 2004 2:27 PM
To: 'The SunHELP List'
Subject: RE: [SunHELP] a question

solaris 8, 9, 10 (& maybe 7) will boot.

in the old days, a partition could reach 100" full.
this did not permit anything to be written to the filesystem. this was
changed several years ago so that solaris would boot.

sun now recommends a / and a swap for disks.

-----Original Message-----
From: sunhelp-bounces at sunhelp.org [mailto:sunhelp-bounces at sunhelp.org]
On Behalf Of Grindell, Joan M.
Sent: Thursday, August 26, 2004 1:04 PM
To: 'Solaris-Users mailing list'; 'The SunHELP List'
Subject: [SunHELP] a question

this is probably a stupid question,  but what happens if the root
directory fills up.  I understand that willnot be bootable. Curious as
to exactly why.

thanks
Joan
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