04-17-2008
I think i have told you already in the other thread the concept of PPs and PP size.
The value is freely selectable upon creation of the VOLUME GROUP, not the LUN. However it limits your disk size as well as the total capacity of the Volume Group you create: maximum 1019 PPs per PV (=hdisk device) and maximum 32 PVs per VG.
Since you plan to create only one PV (as you said in the other thread) you should select the PP size so that you are not near the 1019 PPs per PV limit.
Example: If the LUN is, say, 50GB in size you should use a PP size of 256MB or 512MB if no other aspects apply.
This way you will be able to use LUNs of up to roughly 250 (500) GB in size giving you a theoretical total of approx. 8 (16) TB in the VG. This should be enough space to grow into for most practical purposes when right now your VGs data fit into the 50 GB i based my example on.
I hope this helps.
bakunin
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LEARN ABOUT DEBIAN
ql-dynamic-tgt-lun-disc
ql-dynamic-tgt-disc(8) System Administration ql-dynamic-tgt-disc(8)
NAME
ql-dynamic-tgt-lun-disc - Scans for newly added LUNs.
SYNOPSIS
ql-dynamic-tgt-lun-disc [OPTIONS]
DESCRIPTION
Dynamic TGT-LUN Discovery Utility
This utility scans for newly added LUNs. After adding new LUNs, you do not need to unload, then load the QLogic FC driver or reboot the
system
To begin scanning the LUNs issue following command:
# /usr/sbin/ql-dynamic-tgt-lun-disc
-al, --allow-lip
LIP is not issued by default, even if it is required for scanning new LUNs Setting this option, allows the utility to issue LIP.
-cl, --current-luns
Displays LUNS currently present
-e, --extended-scan
Use this option as "-e | --extended-scan". to rescan LUNs. This will identify any change in attributes of existing LUNs. This option
can be used in combination of scan/refresh or max luns
-h, --help, ?
Prints this help message
-i, --interactive
Use this option to use the menu driven program
-is, --iscsi
Use this option to operate on ISCSI HBAs, this option can be used in combination of any other supported option.
-m, --max-lun
To set the maximum LUNs to be scanned
-p, --proc
Use PROC file system for LUN scanning
-r, --refresh
To refresh, that is remove LUNs that are lost use the options "-r|--refresh". This will remove the LUNs which no more exist.
-s, --scan [ -r|--refresh ]
The QLogic LUN scan utility re-scans all the devices connected to the QLogic HBA
SEE ALSO
ql-lun-state-online(8), ql-hba-snapshot(8), ql-set-cmd-timeout(8)
Matthias Schmitz <matthias@sigxcpu.org> July 2009 ql-dynamic-tgt-disc(8)