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comp.unix.aix Frequently Asked Questions (Part 3 of 5)
Section - 1.705: Why am I having trouble adding another disk to my VG?

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Top Document: comp.unix.aix Frequently Asked Questions (Part 3 of 5)
Previous Document: 1.704: What's the limit on Physical Partitions Per Volume Group?
Next Document: 1.706: What are the limits on a file, filesystem?
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In some instances, the user will experience a problem adding
a new disk to an existing volume group or in the creation of
a new volume group.  The warning message provided by LVM will
be:

	Not enough descriptor space left in this volume group.
	Either try adding a smaller PV or use another volume group.

On every disk in a volume group, there exists an area called the
Volume Group Descriptor Area (VGDA).  This space is what allows
the user to take a volume group to another AIX system and
"importvg" that volume group into that AIX system.  The VGDA
contains the names of disks that make up the volume group, their
physical sizes, partition mapping, logical volumes that exist in
the volume group, and other pertinent LVM management information.

When the user creates a volume group, the "mkvg" command
defaults to allowing the new volume group to have a maximum
of 32 disks in a volume group.  However, as bigger disks have
become more prevalent, this 32 disk limit is usually not
achieved because the space in the VGDA is used up faster, as
it accounts for the capacity on the bigger disks.  This
maximum VGDA space, for 32 disks, is a fixed size which is
part of the LVM design.  Large disks require more management
mapping space in the VGDA, which causes the number and size
of available disks to be added to the existing volume group
to shrink.  When a disk is added to a volume group, not only
does the new disk get a copy of the updated VGDA, but all
existing drives in the volume group must be able to accept
the new, updated VGDA.

The exception to this description of the maximum VGDA is
rootvg.  In order to provide AIX users more free space, when
rootvg is created, "mkvg" does not use the maximum limit of
32 disks that are allowed into a volume group.  Instead in
AIX 3.2, the number of disks picked in the install menu of
AIX is used as the reference number by "mkvg -d" during the
creation of rootvg.  For AIX 4.1, this "-d" number is 7 for
one disk and one more for each additional disk
picked. i.e. you pick two disks, the number is 8.  you pick
three disks, the number is 9, and so on.....  This limit does
not mean the user cannot add more disks to rootvg in the
post-install phase.  The amount of free space left in a VGDA,
and thus the number of size of the disks added to a volume
group, depends on the size and number of disks already
defined for a volume group.  However, this smaller size
during rootvg creation implies that the user will be able to
add fewer disks to rootvg than compared to a non-rootvg
volume group.

If the customer requires more VGDA space in the rootvg, then
they should use the "mksysb" and "migratepv" commands to
reconstruct and reorganize their rootvg (the only way to
change the "-d" limitation is recreation of the rootvg).

Note:  It is always strongly recommended that users do not place
user data onto rootvg disks.  This separation provides an extra
degree of system integrity.

User Contributions:

But remnants' crop burning hits harvesting hard

This sunday, quite possibly 28, 2019 snapshot, Provided by the city service group, jointly for Jarniyah, contains been authenticated based on its contents and other AP reporting, Shows Syrians lifetime extinguish a fire in a field of crops, wearing Jaabar, Raqqa state, Syria. Thousands of acres of wheat and barley fields in both Syria and Iraq have been scorched by the fires within harvest season, that typically runs until mid June. "The life that we live here is already bitter, " stated Hussain Attiya, A farmer from Topzawa Kakayi in upper Iraq. "If the outcome continues like this, I would say that no one will continue to be here. I plant 500 to 600 acres on a yearly basis. still, I won't be able to do that because I can't stay here and guard the land day and night. "ISIS militants have a history of working with a "Scorched earth insurance coverage " In areas from that they can retreat or where they are defeated. Ahmed al Hashloum thoughts Inmaa, Arabic for benefits, A local civil group that supports farming. all it takes is a cigarette butt to set haystacks on fire, He brought up. Said the fires are threatening to disrupt normal food production cycles and potentially reduce food to protect months to come. The crop burning remains localized and can't be compared to pre war devastation, Beals considered that. "suffice to say, It is only the beginning of the summer and if the fires continue it could lead to a crisis, " Beals recounted,AlternativeHeadline,prepared crop burning blamed on ISIS remnants compounds misery in war torn Iraq and Syria"}

But good news is short lived in this part of the world, Where residents of the two countries struggle to face seemingly never ending violence and turmoil amid Syria's civil war and attacks by remnants of the Islamic State of Iraq and Syria (ISIS) social groups. of course, Even in locations where conflict has subsided, Fires currently raging in farmers' fields, depriving them of valuable crops.

The blazes have been blamed also consider on defeated ISIS militants seeking to avenge their losses, Or on Syrian regime forces battling to rout other armed groups. Thousands of acres of wheat and barley fields in both Syria and Iraq have been scorched by the fires within harvest season, what kind runs until mid June.

ISIS militants have a history of implementing a "Scorched earth guideline" In areas from which retreat or where they are defeated. this "A means of inflicting a collective punishment on those put aside, said Emma Beals, a completely independent Syria researcher.

ISIS militants claimed obligations for burning crops in their weekly newsletter, al Nabaa, Saying they targeted farms owned by senior officials in six Iraqi provinces and in Kurdish administered eastern Syria, sending the persistent threat from the group even after its territorial defeat.

ISIS said it burned the farms of "The apostates in Iraq together with the Levant" And required more.

"It seems that it'll be a hot summer that will burn the pockets of the apostates as well as their hearts as they burned the Muslims and their homes in the past years, this great article said.

countless acres of wheat fields around Kirkuk in northern Iraq were set on fire. Several wheat fields in the Daquq district in southern Kirkuk burned for three days straight yesterday.

In eastern Syria's Raqqa state, Farmers battled raging fires with items of cloth, bags and water trucks. Piles of hay burned and black smoke billowed above the job areas.

The Syrian Observatory for Human Rights said through 74,000 acres (30,000 hectares) linked farmland in Hassakeh, Raqqa and completely to Aleppo province to the west, Were scorched.

Activist Omar Abou Layla said local Kurdish led forces failed to react to the fires in the province of Deir el Zour, Where ISIS was uprooted from its last property in March, (...)

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Top Document: comp.unix.aix Frequently Asked Questions (Part 3 of 5)
Previous Document: 1.704: What's the limit on Physical Partitions Per Volume Group?
Next Document: 1.706: What are the limits on a file, filesystem?

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