Heinz, Thanks for clarifying further, I appreciate the extra info! -Scott "Heinz J . Mauelshagen" wrote: > Scott, > > with your PE size of 32MB, you can achieve to create LVs up to 2TB in size > (actually it is a little bit less than 2TB, because every LV can have up > to 64K - 2 extents). You can have multiple 2TB LVs this way, because your > VG capacity is in no means limited to 2TB! In theory you could have 128 SCSI > IDs with 8 LUNs each providing up to 1 or 2TB in 1 VG. > > Because your PVs are smaller than 1TB in size, you will not suffer from > the block adrdessing sign bit danger Andreas was explaining in his email. > > In general you should plan for the largest possible Logical Volume size > during the lifetime of a Volume Group and set the Physical Extent size > (vgcreate -s) acordingly. Even though Linux does not support more than 2TB > per block device today, it will be in the future and you won't suffer from > the LVM1 constraint ITR. > > Regards, > Heinz -- The LVM Guy -- > > On Tue, Nov 27, 2001 at 02:00:07PM -0600, Scott P wrote: > > Andreas, > > > > Thanks so much for the insight! > > > > Here is some ouput, it looks like we might be ok? > > Please comment, if possible, thanks... > > > > -Scott > > > > [root@ptb3 pichelma]# /sbin/pvdisplay /dev/sdb1 > > --- Physical volume --- > > PV Name /dev/sdb1 > > VG Name exp300_2 > > PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB] > > PV# 2 > > PV Status available > > Allocatable yes (but full) > > Cur LV 1 > > PE Size (KByte) 32768 > > Total PE 14102 > > Free PE 0 > > Allocated PE 14102 > > PV UUID 1gKwp2-dotn-0WJU-5FwZ-uScI-OyMH-SHVw5F > > > > > > [root@ptb3 pichelma]# /sbin/pvdisplay /dev/sdc1 > > --- Physical volume --- > > PV Name /dev/sdc1 > > VG Name exp300_2 > > PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB] > > PV# 1 > > PV Status available > > Allocatable yes (but full) > > Cur LV 1 > > PE Size (KByte) 32768 > > Total PE 14102 > > Free PE 0 > > Allocated PE 14102 > > PV UUID ciUWIf-i9OO-okne-Fs6R-fjU1-NPpr-Ml4p8L > > > > > > [root@ptb3 pichelma]# /sbin/pvdata -P /dev/sdb1 > > --- Physical volume --- > > PV Name /dev/sdb1 > > VG Name exp300_2 > > PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB] > > PV# 2 > > PV Status available > > Allocatable yes (but full) > > Cur LV 1 > > PE Size (KByte) 32768 > > Total PE 14102 > > Free PE 0 > > Allocated PE 14102 > > PV UUID 1gKwp2-dotn-0WJU-5FwZ-uScI-OyMH-SHVw5F > > > > > > [root@ptb3 pichelma]# /sbin/pvdata -P /dev/sdc1 > > --- Physical volume --- > > PV Name /dev/sdc1 > > VG Name exp300_2 > > PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB] > > PV# 1 > > PV Status available > > Allocatable yes (but full) > > Cur LV 1 > > PE Size (KByte) 32768 > > Total PE 14102 > > Free PE 0 > > Allocated PE 14102 > > PV UUID ciUWIf-i9OO-okne-Fs6R-fjU1-NPpr-Ml4p8L > > > > > > > > Andreas Dilger wrote: > > > > > On Nov 27, 2001 11:34 -0600, Scott P wrote: > > > > We are planning to add a 3 rd EXP300 array to out current server w/ 2 > > > > EXP300's in place already! We WILL surpass the 1 TB size, if possible? > > > > > > Depends if the driver does 32-bit block numbers with signed or unsigned > > > values. The absolute maximum supported by 2.4 kernels is 2TB devices. > > > I don't know if 2.2 will support > 1TB devices, but it is possible. > > > > > > > Linux ptb3 2.2.19 #2 SMP Tue Jul 24 11:53:29 CDT 2001 i686 unknown > > > > > > > > We are using: > > > > lvm_0.9.1_beta7 > > > > reiserfsprogs-3.x.0j > > > > > > Get newer LVM tools, like 1.0.1, because the old ones have lots more bugs. > > > Beta 7 has the PE alignment bug, so you should upgrade the tools even if > > > you can't upgrade the kernel. > > > > > > > Here is the current filesystem and size: > > > > > > > > /dev/exp300_2/exp300_lv2 924160464 891307744 32852720 97% /files1 > > > > > > > Q: Why are my logical volumes limited to 256 GB in size? > > > > A: This is NO absolute limit but it depends on the physical extent size > > > > you configured at volume group creation time. > > > > > > Check what "pvdata -P /dev/whatever" tells you about the PE size. If > > > it is 16386kB, then you are limited to 1TB in size. If it is larger > > > than that, you _may_ be able to go past 1TB, but you may not, depending > > > on whether your drivers and kernel work properly or not. > > > > > > Cheers, Andreas > > > -- > > > Andreas Dilger > > > http://sourceforge.net/projects/ext2resize/ > > > http://www-mddsp.enel.ucalgary.ca/People/adilger/ > > > > > > _______________________________________________ > > > linux-lvm mailing list > > > linux-lvm@sistina.com > > > http://lists.sistina.com/mailman/listinfo/linux-lvm > > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > > > > > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm@sistina.com > > http://lists.sistina.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > > *** Software bugs are stupid. > Nevertheless it needs not so stupid people to solve them *** > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > Heinz Mauelshagen Sistina Software Inc. > Senior Consultant/Developer Am Sonnenhang 11 > 56242 Marienrachdorf > Germany > Mauelshagen@Sistina.com +49 2626 141200 > FAX 924446 > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
