* [linux-lvm] Is there a maximum for LV? @ 2003-12-09 8:31 Yanick Quirion 2003-12-09 13:27 ` Jose Luis Domingo Lopez 0 siblings, 1 reply; 4+ messages in thread From: Yanick Quirion @ 2003-12-09 8:31 UTC (permalink / raw) To: linux-lvm Hi, On the past I was using lvm 1.1rc2. For an unknown reason, the version is not anymore available. But with this version, when I do a "vgdisplay" I was able to saw the LV Max Size: [moonlight]:/# vgdisplay --- Volume group --- VG Name vg1 VG Access read/write VG Status available/resizable VG # 1 MAX LV 255 Cur LV 1 Open LV 1 MAX LV Size 1023.97 GB <---------- Max PV 255 Cur PV 2 Act PV 2 VG Size 254.31 GB PE Size 16 MB Total PE 16276 Alloc PE / Size 16276 / 254.31 GB Free PE / Size 0 / 0 VG UUID 31iNWK-Ario-C4tq-yQNi-sGVk-gGs0-CjVV7T How I'm testing LVM2. The field "MAX LV Size" is not there anymore. Is this means that LV doesn't have a maximum? Output from LVM2: [neptune]:/u# lvm vgdisplay vg02 /dev/cdrom: open failed: Read-only file system --- Volume group --- VG Name vg02 System ID localhost.localdomain1070620502 Format lvm2 Metadata Areas 2 Metadata Sequence No 18 VG Access read/write VG Status resizable MAX LV 256 Cur LV 1 Open LV 1 Max PV 256 Cur PV 2 Act PV 2 VG Size 50.86 GB PE Size 4.00 MB Total PE 13019 Alloc PE / Size 13019 / 50.86 GB Free PE / Size 0 / 0 VG UUID Rw0ckX-GCd2-vlyF-KSWf-Q5tg-Qp2u-0Qjc7E I just want to make sure that my configuration is all set to support very large LV. Thanks again for your precious help! Regards! ----------- Yanick Quirion Administrateur Réseau/Network Manager NEOKIMIA INC. Institut de Pharmacologie de Sherbrooke 3e étage (Édifice Z5) 3001 12e avenue Nord Sherbrooke, Québec CANADA J1H 5N4 Tél.: +1 819 820-6040 Direct: +1 819 820-6855 Fax.: +1 819 820-6841 email: Yanick.Quirion@neokimia.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Is there a maximum for LV? 2003-12-09 8:31 [linux-lvm] Is there a maximum for LV? Yanick Quirion @ 2003-12-09 13:27 ` Jose Luis Domingo Lopez 2003-12-09 16:09 ` Alasdair G Kergon 2003-12-10 7:57 ` AJ Lewis 0 siblings, 2 replies; 4+ messages in thread From: Jose Luis Domingo Lopez @ 2003-12-09 13:27 UTC (permalink / raw) To: linux-lvm On Tuesday, 09 December 2003, at 09:29:05 -0500, Yanick Quirion wrote: > On the past I was using lvm 1.1rc2. For an unknown reason, the version is not anymore available. > But with this version, when I do a "vgdisplay" I was able to saw the LV Max Size: > > How I'm testing LVM2. The field "MAX LV Size" is not there anymore. Is this means that LV doesn't have a maximum? > From vgcreate(8): -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT] Sets the physical extent size on physical volumes of this volume group. A size suffix (k for kilobytes up to t for terabytes) is optional, megabytes is the default if no suffix is present. Values can be from 8 KB to 16 GB in powers of 2. The default of 4 MB causes maximum LV sizes of ~256GB because as many as ~64k extents are supported per LV. In case larger maximum LV sizes are needed (later), you need to set the PE size to a larger value as well. Later changes of the PE size in an existing VG are not supported. So it seems you have a 255 GiB limit on LV sizes with your LVM2 setup. This same limitation is what applies to LVM2 Logical Volumes, and the math is simple to do. Greetings. -- Jose Luis Domingo Lopez Linux Registered User #189436 Debian Linux Sid (Linux 2.6.0-test10-mm1) ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Is there a maximum for LV? 2003-12-09 13:27 ` Jose Luis Domingo Lopez @ 2003-12-09 16:09 ` Alasdair G Kergon 2003-12-10 7:57 ` AJ Lewis 1 sibling, 0 replies; 4+ messages in thread From: Alasdair G Kergon @ 2003-12-09 16:09 UTC (permalink / raw) To: linux-lvm > > How I'm testing LVM2. The field "MAX LV Size" is not there anymore. Is this means that LV doesn't have a maximum? Correct: Provided you use the new "lvm2" metadata format, you're limited only by disk space and the maximum device size that your kernel will support. > >From vgcreate(8): > -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT] > So it seems you have a 255 GiB limit on LV sizes with your LVM2 setup. That section now only applies to PVs in "lvm1" format. It needs updating... For tool performance reasons it's still a good idea to use large physical extent sizes for large volume groups. (This will get fixed eventually.) Alasdair -- agk@uk.sistina.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Is there a maximum for LV? 2003-12-09 13:27 ` Jose Luis Domingo Lopez 2003-12-09 16:09 ` Alasdair G Kergon @ 2003-12-10 7:57 ` AJ Lewis 1 sibling, 0 replies; 4+ messages in thread From: AJ Lewis @ 2003-12-10 7:57 UTC (permalink / raw) To: linux-lvm [-- Attachment #1: Type: text/plain, Size: 2704 bytes --] On Dec 9, 2003, at 1:26 PM, Jose Luis Domingo Lopez wrote: > On Tuesday, 09 December 2003, at 09:29:05 -0500, > Yanick Quirion wrote: > >> On the past I was using lvm 1.1rc2. For an unknown reason, the >> version is not anymore available. >> But with this version, when I do a "vgdisplay" I was able to saw the >> LV Max Size: >> >> How I'm testing LVM2. The field "MAX LV Size" is not there anymore. >> Is this means that LV doesn't have a maximum? >> > From vgcreate(8): > -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT] > Sets the physical extent size on physical volumes of this volume > group. A size suffix (k for kilobytes up to t for terabytes) is > optional, megabytes is the default if no suffix is present. > Values can be from 8 KB to 16 GB in powers of 2. The default of > 4 MB causes maximum LV sizes of ~256GB because as many as ~64k > extents are supported per LV. In case larger maximum LV sizes > are needed (later), you need to set the PE size to a larger > value as well. Later changes of the PE size in an existing VG > are not supported. > > So it seems you have a 255 GiB limit on LV sizes with your LVM2 setup. > This > same limitation is what applies to LVM2 Logical Volumes, and the math > is > simple to do. Actually, LVM2 no longer has a limitation on LV size based on PE size when using format2 metadata (which is used by default when creating new VGs). So Yanick is correct in surmising the LV no longer has a maximum in LVM2 if the VG and LVs in question were created with the lvm2 tools. If the VG was made with LVM1, or was created with the -M1 flag to vgcreate in LVM2, it does indeed still have the limit imposed by the format1 metadata. Regards, -- AJ Lewis Sistina Software Inc. http://www.sistina.com 720 Washington Ave, Suite 200 Voice: 612-638-0500 Minneapolis, MN 55414 E-Mail: lewis_NOSPAM_(AT)sistina(DOT)com Current GPG fingerprint = D638 9C01 D08F 29A4 5D50 D064 F6A6 0ED6 E386 E6EB Grab the key at: http://people.sistina.com/~lewis/gpg.html or one of the many keyservers out there... I have yet to meet a C compiler that is more friendly and easier to use than eating soup with a knife. -- AJ Lewis Sistina Software Inc. http://www.sistina.com 720 Washington Ave, Suite 200 Voice: 612-638-0500 Minneapolis, MN 55414 E-Mail: lewis_NOSPAM_(AT)sistina(DOT)com Current GPG fingerprint = D638 9C01 D08F 29A4 5D50 D064 F6A6 0ED6 E386 E6EB Grab the key at: http://people.sistina.com/~lewis/gpg.html or one of the many keyservers out there... Chaos, panic, pandemonium - my work here is done [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 186 bytes --] ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2003-12-10 7:57 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2003-12-09 8:31 [linux-lvm] Is there a maximum for LV? Yanick Quirion 2003-12-09 13:27 ` Jose Luis Domingo Lopez 2003-12-09 16:09 ` Alasdair G Kergon 2003-12-10 7:57 ` AJ Lewis
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