Rép. : Re: [K12OSN] Uninteruptable Power Supply UPS with Linux

Thu Nov 16 01:41:43 UTC 2006

>From my limited experience, either the second disk gets all of the information in it's journal and will eventually get back in synch with the first disk or the information did not all get into the journal and the disk will be out of synch. From this second scenario, either the miror gets in synch by itself or the second disk gets kicked out of the array and you wil have to manually resynch "rebuild" the second disk. Just a simple one line command.

Guy Lessard
Professeur CÉGEP de l'Outaouais
Québec, Canada
>>> "Robert Arkiletian" <robark at gmail.com> 15/11/06 20:31 >>>
Thought I would just thank the list for the help to setup my UPS. Today we
had a power outage. One week after I setup my UPS. I got a 1500VA Back-UPS
(not the expensive Smart ones). So I had to set the shutdown timeout in the
conf file.  Hadn't even gotten around to testing it yet. Worked like a charm
doing a clean shutdown today . Talk about luck.

BTW just wondering. Is there any benefit to using ext3 filesystem in a
software RAID1? I know that ext3 is journalled but with a mirror what's the
point if one of the drives completes a write but the other doesn't (due to
power loss). Won't the array still be corrupted? Anyone with experience?

On 10/16/06, Robert Arkiletian <robark at gmail.com> wrote:
>
>
>
> On 10/16/06, James P. Kinney III <jkinney at localnetsolutions.com> wrote:
> >
> > On Mon, 2006-10-16 at 13:04 -0600, Calvin Dodge wrote:
> > > On 10/16/06, Robert Arkiletian <robark at gmail.com> wrote:
> > > >
> > > >
> > > >  Why do you recommend usb over serial?
> > >
> > > The cheaper APCs don't do true serial communication (i.e., sending
> > > data to the computer). Instead, they set certain signals (like CTS,
> > > IIRC) to indicate their condition.
> >
> > It even more complicated than that. The different models transmit
> > differing amounts of data. Whether the data port is serial or usb makes
> > no difference. The Back-UPS vs the Smart-UPS have a large amount of
> > functionality difference. The Backups is simpler and has only a timer
> > function. Once it goes on battery, the timer starts. At the end of the
> > timer, it send the shutdown command to the host.
> >
> > The smartups has much more of a command set. It supports battery
> > condition testing and and can signal a power down when the battery falls
> >
> > below a certain level. More importantly, it can hold of on powering back
> > up until the battery has reached a certain minimum runtime level.
> >
> > On my current install, we have Smart-UPS XL 3000VA RM 3U models that
> > have both serial and USB connectors. The same data is on both ports.
> >
> > One nice thing about these (and all Linux systems can be setup to do
> > this) is when the shutdown command is issued, the apcupsd can be told to
> >
> > also send it to a group of other machines. In my current case, there are
> > several servers that run off the UPS in the rack. If the UPS is going
> > down that powers the main login/NFS-/home machine, every other server
> > will need to also shut down as they will have nothing they can do. If a
> > UPS signals to a boot/app server the remaining app servers can stay up.
> >
> > So the UPS is told power back up when the AC as back and the batteries
> > are back up to enough time to allow a partially booted system to shut
> > down gracefully. The first box up is the NFS server. It will then tickle
> > the other machines with Wake-on LAN calls (as soon as I can finish that
> > process).
>
>
>
> Wow nice info James. Thanks. I really like the fact that one box can tell
> the others to shutdown also. Is this done by setting up ssh keys? There must
> be some kind of auth required.
>
>
> >
> > > USB allows for real communication with the host computer, and I
> > > _believe_ that means real data gets sent to that host. For example,
> > > here's the output of "apcaccess" on my workstation:
> > >
> > > APC      : 001,034,0890
> > > DATE     : Mon Oct 16 12:59:50 MDT 2006
> > > HOSTNAME : source-server.prosocial.local
> > > RE  : source-server.prosocial.local
> > > CABLE    : USB Cable
> > > MODEL    : Back-UPS NS 600
> > > UPSMODE  : Stand Alone
> > > STARTTIME: Fri Oct 13 13:05:46 MDT 2006
> > > STATUS   : ONLINE
> > > LINEV    : 118.0 Volts
> > > LOADPCT  :   0.0 Percent Load Capacity
> > > BCHARGE  : 100.0 Percent
> > > TIMELEFT :  42.8 Minutes
> > > MBATTCHG : 5 Percent
> > > MINTIMEL : 3 Minutes
> > > MAXTIME  : 0 Seconds
> > > LOTRANS  : 088.0 Volts
> > > HITRANS  : 139.0 Volts
> > > ALARMDEL : Always
> > > BATTV    : 13.5 Volts
> > > LASTXFER : Low line voltage
> > > NUMXFERS : 0
> > > TONBATT  : 0 seconds
> > > CUMONBATT: 0 seconds
> > > XOFFBATT : N/A
> > > STATFLAG : 0x07000008 Status Flag
> > > MANDATE  : 2005-12-26
> > > SERIALNO : 3B0601X00177
> > > BATTDATE : 2000-00-00
> > > NOMBATTV :  12.0
> > > FIRMWARE : 18.w1 .D USB FW:w1
> > > APCMODEL : Back-UPS NS 600
> > > END APC  : Mon Oct 16 12:59:51 MDT 2006
> > >
> > >
> > > I'm reasonably certain a serial signal-only connection can't convey
> > > that much information to the host (I've no great emotional stake in
> > > this, and won't complain if somebody can post similar output from a
> > > signal-only UPS).
> > >
> > > >
> > > >  I am using the CentOS 4 based k12ltsp.
> > >
> > > RPMs are available for RHEL3 at the apcupsd site
> > > (
> > http://sourceforge.net/project/showfiles.php?group_id=54413&package_id=73150
> > ).
> > > I think that's the closest match to CentOS 4 (being directly descended
> >
> > > from RHEL4).
> > >
> > > Calvin
> > >
> > > _______________________________________________
> > > K12OSN mailing list
> > > K12OSN at redhat.com
> > > https://www.redhat.com/mailman/listinfo/k12osn
> > > For more info see <http://www.k12os.org>
> > --
> > James P. Kinney III
> > CEO & Director of Engineering
> > Local Net Solutions,LLC
> > 770-493-8244
> > http://www.localnetsolutions.com
> >
> > GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> > <jkinney at localnetsolutions.com >
> > Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
> >
> >
> > _______________________________________________
> > K12OSN mailing list
> > K12OSN at redhat.com
> > https://www.redhat.com/mailman/listinfo/k12osn
> > For more info see <http://www.k12os.org>
> >
> >
> >
>
>
> --
> Robert Arkiletian
> Eric Hamber Secondary, Vancouver, Canada
> Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
> C++ GUI tutorial http://www3.telus.net/public/robark/
>

-- 
Robert Arkiletian
Eric Hamber Secondary, Vancouver, Canada
Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
C++ GUI tutorial http://www3.telus.net/public/robark/