I am going to create a vif using two interfaces (e0a and e0c). The IP address of e0a is going to be the IP for the vif, e0c is not in use.
I was hoping to do this without shutting down, and disrupt connections on that IP for just a few seconds.
Do I need to "ifconfig down" e0a before running "vif create" ?
For speed and accuracy, I will put the commands in a file beforehand and run it with "source".
The switch is configured, but I have to move the cables to the configured ports. Should I do this before running "vif create" ?
This is a clustered pair, so I will be doing this on both filers. Any clustering issues to worry about? Should I "cf disable" before and "cf enable" after to avoid any unwanted fail overs?
I would appreciate any suggestions on how best to do this.
Thanks,
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
Hey Steven
On Mon, Nov 23, 2009 at 13:19, Steve Losen scl@sasha.acc.virginia.edu wrote:
I am going to create a vif using two interfaces (e0a and e0c). The IP address of e0a is going to be the IP for the vif, e0c is not in use.
What type of VIF are you creating?
I was hoping to do this without shutting down, and disrupt connections on that IP for just a few seconds.
Do I need to "ifconfig down" e0a before running "vif create" ?
Yes. Also, the mac-address associated with the IP may change.
For speed and accuracy, I will put the commands in a file beforehand and run it with "source".
The switch is configured, but I have to move the cables to the configured ports. Should I do this before running "vif create" ?
Depends on the type of vif. In case of a single or lacp, you should do this before creating the vif, however, with a multi you should not, as you risk losing up to 50% of your packets.
This is a clustered pair, so I will be doing this on both filers. Any clustering issues to worry about? Should I "cf disable" before and "cf enable" after to avoid any unwanted fail overs?
Again, depends if you have cluster failover on network failure on. Best is to switch this off during these kinds of actions to avoind unwanted takeovers (which will return the filers to their original network config.
I would appreciate any suggestions on how best to do this.
Whatever you do, do not forget to change the /etc/rc to reflect the changes. If you do forget, your filer will be lost after a reboot.
I have done this before, but you may run into arp issues. I am not sure which MAC the VIF will take on. You may have to delete rarp caches in switches...or wait twenty minutes for it to clear on its' own.
You can modify the /etc/rc file and make sure it is perfect. I use LACP vifs when I need them. That can always be changed to multi if you do not want to or can not use LACP on your switch.
***SNIP*** vif create lacp vif0 -b mac e0a e0a ifconfig vif0 `hostname`-vif0 mediatype auto flowcontrol full netmask x.x.x.x partner vif0 route add default router 1 ***SNIP***
Of course, make sure `hostname`-vif0 and router exists in the /etc/hosts file. Also, make sure that router exists in the /etc/dgateways file.
Then you could do something crazy like:
route -f ; ifconfig e0a 0.0.0.0 down ; <repeat for each and every interface that is up using a semicolon between each> ; source /etc/rc
I usually get my prompt back in a few seconds, however, much safer to run this command from the rlm or console...just in case.
--tmac Tim McCarthy Principal Consultant
RedHat Certified Engineer 804006984323821 (RHEL4) 805007643429572 (RHEL5)
On Mon, Nov 23, 2009 at 7:19 AM, Steve Losen scl@sasha.acc.virginia.eduwrote:
I am going to create a vif using two interfaces (e0a and e0c). The IP address of e0a is going to be the IP for the vif, e0c is not in use.
I was hoping to do this without shutting down, and disrupt connections on that IP for just a few seconds.
Do I need to "ifconfig down" e0a before running "vif create" ?
For speed and accuracy, I will put the commands in a file beforehand and run it with "source".
The switch is configured, but I have to move the cables to the configured ports. Should I do this before running "vif create" ?
This is a clustered pair, so I will be doing this on both filers. Any clustering issues to worry about? Should I "cf disable" before and "cf enable" after to avoid any unwanted fail overs?
I would appreciate any suggestions on how best to do this.
Thanks,
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
Our filers and shelves are currently on 110v power. We'd like to switch to 208v, possibly without downtime. I'm thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
Thanks
Suresh
I certainly would not be brave enough to try that. Not sure what having 208 on one side and 110 on the other would do, but seems like a potential for disaster.
On Mon, Nov 23, 2009 at 2:31 PM, Suresh Rajagopalan < SRajagopalan@williamoneil.com> wrote:
Our filers and shelves are currently on 110v power. We’d like to switch to 208v, possibly without downtime. I’m thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
Thanks
Suresh
Well, they are auto-ranging power supplies. It should work. I was always told it is fine for a very short while, just don't bet the bank on leaving it that way.
--tmac Tim McCarthy Principal Consultant
RedHat Certified Engineer 804006984323821 (RHEL4) 805007643429572 (RHEL5)
On Mon, Nov 23, 2009 at 2:59 PM, Bill Holland hollandwl@gmail.com wrote:
I certainly would not be brave enough to try that. Not sure what having 208 on one side and 110 on the other would do, but seems like a potential for disaster.
On Mon, Nov 23, 2009 at 2:31 PM, Suresh Rajagopalan < SRajagopalan@williamoneil.com> wrote:
Our filers and shelves are currently on 110v power. We’d like to switch to 208v, possibly without downtime. I’m thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
Thanks
Suresh
..shouldn't be a problem. The low-side of the Power Supply is the same for both high-side voltages. So, assuming you're plugging into a 208V power source on the "new" Power Supplies, it should work fine.
Best Regards,
Kevin
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Bill Holland Sent: Monday, November 23, 2009 2:59 PM To: Suresh Rajagopalan Cc: toasters@mathworks.com Subject: Re: Power change 110 to 208v without downtime
I certainly would not be brave enough to try that. Not sure what having 208 on one side and 110 on the other would do, but seems like a potential for disaster.
On Mon, Nov 23, 2009 at 2:31 PM, Suresh Rajagopalan SRajagopalan@williamoneil.com wrote:
Our filers and shelves are currently on 110v power. We'd like to switch to 208v, possibly without downtime. I'm thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
Thanks
Suresh
Let us know if it works :-)
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Kevin H. Schoener Sent: Monday, November 23, 2009 3:25 PM To: Bill Holland; Suresh Rajagopalan Cc: toasters@mathworks.com Subject: RE: Power change 110 to 208v without downtime
..shouldn't be a problem. The low-side of the Power Supply is the same for both high-side voltages. So, assuming you're plugging into a 208V power source on the "new" Power Supplies, it should work fine.
Best Regards,
Kevin
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Bill Holland Sent: Monday, November 23, 2009 2:59 PM To: Suresh Rajagopalan Cc: toasters@mathworks.com Subject: Re: Power change 110 to 208v without downtime
I certainly would not be brave enough to try that. Not sure what having 208 on one side and 110 on the other would do, but seems like a potential for disaster.
On Mon, Nov 23, 2009 at 2:31 PM, Suresh Rajagopalan SRajagopalan@williamoneil.com wrote:
Our filers and shelves are currently on 110v power. We'd like to switch to 208v, possibly without downtime. I'm thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
Thanks
Suresh
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My educated guess is that you can do this safely and for as long as you wish. The power supplies are pretty much independent of one another, and they produce the same output regardless of whether you put 110V or 208V into them -- the filer doesn't know the difference. I have done this with large HP DL-class servers and have not had any problems.
Suresh Rajagopalan wrote:
Our filers and shelves are currently on 110v power. We’d like to switch to 208v, possibly without downtime. I’m thinking of moving each power supply one by one from 110v to 208v. Are there any issues doing it this way?
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Andrew Siegel -
Bill Holland -
Kevin H. Schoener -
Nils Vogels -
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Steve Losen -
Suresh Rajagopalan -
tmac