Hi, thanks guys for the info. Maybe a little more clarification on the situation.
The logical volume will be used for a heavily used DB2 production machine, so I'm looking for a maximum I/O throughput. Extending is not an issue here. This is just a temporary situation till we migrate to SLES11 to use hyperPAV on MOD 27 disks. Meanwhile a lvextend is very unlikely. The reason why I can't wait for the migration to SLES11 is because we are in the middle of a SAN migration. I should definitely test the situation with different stripecounts considering the I/O channels. best regards Samir Reddahi From: "Frank Schwede, LSY" <[email protected]> To: [email protected] Date: 22/03/2011 13:58 Subject: AW: maximum stripes in a logical volume Sent by: Linux on 390 Port <[email protected]> Hi, http://www.linuxtopia.org/online_books/rhel6/rhel_6_lvm_admin/rhel_6_lvm_stripe_extend.html My thoughts: · your stripecount also defines the count of disks you need for proper extending. · performance wont be increased much, if you define more stripes than I/O channels (so maybe 8 or 16 is enough) · maybe you should think about creating Model27 or Model54 disks and let the subsystem support the OS in this case · And maybe create a linear LVM and use PAV "parallel access to volume" with those M27/M54 br Frank Von: Linux on 390 Port [mailto:[email protected]] Im Auftrag von Samir Reddahi Gesendet: Dienstag, 22. März 2011 11:17 An: [email protected] Betreff: maximum stripes in a logical volume I created a volume group with 144 MOD-9 disks. Usually when I create logical volumes, I create them with stripes equalling the number of volumes in the volume group. But apparently you can only define a maximum of 128 stripes on a logical volume. What do I do best in this situation? Is it OK to use the maximum 128 for a 144 disk volume group? Could it cause a problem, for example fragmentation? Or do I use a divisor of 144, e.g. 72? Best regards, Samir Reddahi System Engineer | Systeem MF, AS400, DBA Operations T +32 9 235 61 09 | M +32 478 80 68 30 [email protected] <mailto:[email protected]> www.securex.be <http://www.securex.be/> - Confidentiality Notice - This communication and the information it contains is intended (a) for the person(s) or organization(s) named above and for no other person or organization, and (b) may be confidential, legally privileged and protected by law. Unauthorized use, copying or disclosure of any of it may be unlawful! If you receive this communication in error, please notify us immediately, destroy any copies and delete it from your computer system. Please consult our disclaimer on our site www.securex.eu Thank you. Sitz der Gesellschaft / Corporate Headquarters: Lufthansa Systems Infratec GmbH, Kelsterbach, Registereintragung / Registration: Amtsgericht Darmstadt 83851 Vorsitzender des Aufsichtsrats / Chairman of the Supervisory Board: Dr. Gunter Kuechler Geschaeftsfuehrung / Management Board: Dr. Hannes Pfister ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ [attachment "image001.jpg" deleted by Samir Reddahi/I/SECUREX] [attachment "image002.jpg" deleted by Samir Reddahi/I/SECUREX] - Confidentiality Notice - This communication and the information it contains is intended (a) for the person(s) or organization(s) named above and for no other person or organization, and (b) may be confidential, legally privileged and protected by law. Unauthorized use, copying or disclosure of any of it may be unlawful! If you receive this communication in error, please notify us immediately, destroy any copies and delete it from your computer system. Please consult our disclaimer on our site www.securex.eu Thank you.
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