From mboxrd@z Thu Jan 1 00:00:00 1970 In-Reply-To: <1122583121.9888.57.camel@localhost.localdomain> References: <42E92D7E.5090900@levanta.com> <1122578286.9888.47.camel@localhost.localdomain> <511428deb4d089c0e0d213b7e81a9fe7@redhat.com> <1122583121.9888.57.camel@localhost.localdomain> Mime-Version: 1.0 (Apple Message framework v622) Message-Id: Content-Transfer-Encoding: 7bit From: Jonathan E Brassow Subject: Re: [linux-lvm] How do you create large numbers of LVs? (In the 1000s) Is it even possible? Date: Thu, 28 Jul 2005 15:49:24 -0500 Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: mingz@ele.uri.edu Cc: LVM general discussion and development yeah... it could be a memory issue which is causing the difference in active lvs. It could be the fact that he starts with _inactive_ lvs that allows him to create so many to start. To see if you are experiencing the same bug, you could 'vgchange -an ' and then try to create a bunch of lvs... Then, once created, try to activate them. brassow On Jul 28, 2005, at 3:38 PM, Ming Zhang wrote: > i think this is strange that this guy can at least create 1500 lv but > fail to activate them all. > > here what i found is i even can not create ~300 lv. > > > ming > > > On Thu, 2005-07-28 at 15:32 -0500, Jonathan E Brassow wrote: >> I think the problem you are seeing is similar to the one found in >> bugzilla (164198). Would you be willing to add some notes there? It >> will give you a place to track the progress... >> >> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=164198 >> >> brassow >> >> On Jul 28, 2005, at 2:18 PM, Ming Zhang wrote: >> >>> On Thu, 2005-07-28 at 12:09 -0700, Nathaniel Stahl wrote: >>>> We'd like to be able to create a large number of LVs (potentially >>>> numbering in the low thousands). I get failure after LV 226 or so, >>>> though - "VG VolGroup01 metadata writing failed". >>>> >>>> RedHat claims this should be possible with LVM2 on the following web >>>> page: >>>> >>>> http://www.redhat.com/magazine/009jul05/features/lvm2/ >>>> >>>> I admit to being a little suprised at the 2^32 max LV claim - I was >>>> figuring 2^20 as the theoretical max given 2.6's 32 bit device >>>> numbering >>>> scheme (20 bits for minor, 12 bits for major). >>>> >>>> The LVM2 code, at least version 2.00.25 as distributed in FC3, >>>> appears >>>> to have a check that the minor number is strictly less than 256. >>>> Removing this check allows for the creation of working LVs using >>>> minors >>>> greater than 256, but LV creation fails with the error "VG >>>> VolGroup01 >>>> metadata writing failed" creating the 227th LV. Even with the minor >>>> limit in place - I can't create more than 226 LVs. >>> >>> i asked this question before. there is a hard coded limitation in lvm >>> metadata, so the real number is like this, limited around 2xx. the >>> limitation will be removed in near future. how near? i do not know. >>> :) >>> >>> >>>> >>>> Is there a patch that allows this limit to be broken? Should I be >>>> using >>>> a newer version of the tools? If not currently possible, is this >>>> something that will be in the near future? >>>> >>>> Thanks for any help/advice you can give. >>>> >>>> -Nate Stahl >>>> >>>> _______________________________________________ >>>> linux-lvm mailing list >>>> linux-lvm@redhat.com >>>> https://www.redhat.com/mailman/listinfo/linux-lvm >>>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >>> >>> _______________________________________________ >>> linux-lvm mailing list >>> linux-lvm@redhat.com >>> https://www.redhat.com/mailman/listinfo/linux-lvm >>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >>> >> >