Rick You must have missed my first posting, or maybe I was not clear enough. We _are_ talking about the same thing.
Now we are already three or four thinking of it as a useful feature, the pression on Neil is dramatically increasing ... ;-) Regards, Chris On Mon, 13 Feb 2006 09:21:06 -0800 "Stern, Rick (Serviceguard Linux)" <[EMAIL PROTECTED]> wrote: > I understand about HP-UX mirroring/LVM. > > I was a little too obtuse. > > LVM2 has a feature (not well advertised) that allows an VG to be tagged so it > will not be activated by "system b" if it is already tagged as being in use > by "system a". I was suggesting that a similar feature could be added to MD. > This way a MD array could be marked as "owned" and, if so, mdadm would not > activate it from another system. This way all of the MD control is still > within mdadm. > > If Neil is interested, I'll try to dig up more info. > > Regards, > Rick > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Osicki > Sent: Monday, February 13, 2006 9:13 AM > To: [email protected] > Subject: Re: Question: array locking, possible? > > > > Rick > > On HP-UX disk mirroring is done in LVM. I'm using md driver for > mirroring and LVM on top of it. Controlling access to my disks in LVM > is just too late. I would have to assemble the array before I can activate > VGs. If the array in question is being used on the other host nobody > can guarantee that bad thing wont happen. And what I would like to > prevent is: two hosts accessing (writing) an array. > Thanks anyway for the hint. > > Regards, > Chris > > > On Thu, 9 Feb 2006 10:28:58 -0800 > "Stern, Rick (Serviceguard Linux)" <[EMAIL PROTECTED]> wrote: > > > There is more interest, just not vocal. > > > > May want to look at LVM2 and its ability to use tagging to control > > enablement of VGs. This way it is not HW dependent. > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Osicki > > Sent: Thursday, February 09, 2006 2:26 AM > > To: [email protected] > > Subject: Re: Question: array locking, possible? > > > > > > > > It looks like we are the only two md users interested in such a > > feature. > > Not enough to get Neil's attention ;-) > > > > Regards, > > Chris > > > > On Wed, 8 Feb 2006 21:45:33 +0100 > > Jure Peèar <[EMAIL PROTECTED]> wrote: > > > > > On Wed, 8 Feb 2006 11:55:49 +0100 > > > Chris Osicki <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > > > > > I was thinking about it, I have no idea how to do it on Linux if ever > > > > possible. > > > > I connect over fibre channel SAN, using QLogic QLA2312 HBAS, if it > > > > matters. > > > > > > > > Anyone any hints? > > > > > > I too am running a jbod with md raid between two machines. So far md never > > > caused any kind of problems, altough I did have situations where both > > > machines were syncing mirrors at once. > > > > > > If there's a little tool to reserve a disk via scsi, I'd like to know > > > about > > > it too. Even a piece of code would be enough. > > > > > > > > > -- > > > > > > Jure Peèar > > > http://jure.pecar.org/ > > > - > > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > > the body of a message to [EMAIL PROTECTED] > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to [EMAIL PROTECTED] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > - > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to [EMAIL PROTECTED] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
