Re: [cobalt-users] raq4m acceptable ram usage

[abel <abelgv@xxxxxxxxxxxxxx>]

Hi Dmitry, thank you very much for your help . As the end of this mail i
paste my uptime with the memory data as you suggested ( now the server
is lightly less busy than yesterday ). 

is there a tool or something i can use to detect problems in hard disk ?
i do not have phisical access to the server.
It would be nice to predict that hd crashes so i can order a new hd. I
think i will put some more RAM and will monitor swap. thanks.


[admin admin]$ uptime
  3:58am  up 7 days, 15:52,  1 user,  load average: 2.19, 1.57, 1.55
[admin admin]$ free
             total       used       free     shared    buffers    
cached
Mem:        127776     113224      14552     155324      11056     
24248
-/+ buffers/cache:      77920      49856
Swap:       144544      20808     123736
[admin admin]$ cat /proc/meminfo 
        total:    used:    free:  shared: buffers:  cached:
Mem:  130842624 115900416 14942208 159076352 11321344 24858624
Swap: 148013056 21307392 126705664
MemTotal:    127776 kB
MemFree:      14592 kB
MemShared:   155348 kB
Buffers:      11056 kB
Cached:       24276 kB
SwapTotal:   144544 kB
SwapFree:    123736 kB




On mié, 2004-02-11 at 11:13, Dmitry Alexeyev wrote:
> Hello! 
> 
> Please, show output of `uptime' too. 
> 
> You have 21 Mb in swap, it could be dangerous if it is refreshened too 
> fast; may lead directly to hdd crash (I had two in 3 years due to lack 
> of RAM and high HDD activity. That was Sun's hdd, but not RaQ.)
> 
> Actually, you get 21 Mb in swap after a couple of weeks, it's okay - 
> memory leaks, etc (not very high disk activity). Just reboot your 
> server once a month or so.
> 
> If there's too high disk activity in the swap partition area, you will 
> have: 
> a) random reboots
> b) filesystem dismounts on the fly (pages loss => proccess locking => 
> cron activity generates new ones => memory full => kernel semi-crash 
> (accepts socket connections, pings, but doesn't fork) 
> (very common scenario with bad blocks in swap space)
> c) dead proccesses (due to page faults) 
> 
> One of my servers lived with almost dead hdd, but it's been crashing 
> every week. 
> 
> Good solution, if you would have such problems in future is to move swap 
> partition somewhere (using parted + mkswap) else, and keep the old area 
> empty. 
> 
> Best Regards,
> Dmitry
> 
> >
> > My raq4 has 128MB Ram and is running several sites, more or less
> > 70000 daily pages with use of php+mysql.
> > It is not working slow, but i would like to know if you can tell me
> > from your experience if I should put
> > more RAM ( maybe 256 ). These is my usual memory use:
> >
> > [user user]$ cat /proc/meminfo
> >         total:    used:    free:  shared: buffers:  cached:
> > Mem:  130842624 124936192  5906432 103227392  3366912 24158208
> > Swap: 148013056 22814720 125198336
> > MemTotal:    127776 kB
> > MemFree:       5768 kB
> > MemShared:   100808 kB
> > Buffers:       3288 kB
> > Cached:       23592 kB
> > SwapTotal:   144544 kB
> > SwapFree:    122264 kB
> >
> > [user user]$ free -m
> >              total       used       free     shared    buffers    
> > cached Mem:           124        119          5         98          3
> >         23 -/+ buffers/cache:         93         31
> > Swap:          141         21        119
> >
> >
> > do you think my server is too busy ? is there a aprox. limit when you
> > say: "ok,
> > we need more ram" ?
> 
> 
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