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Hi, I am having a problem with a correct method for fdisk raw
partitions in preparation for Oracle OCR. I know that you cant fdisk the
/dev/mapper or /dev/dm-1 disks directly. Currently we have the following setup mpath11 (360a98000433543364734454a6f533061) [size=300 MB][features="1
queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [prio=8][active] \_ 3:0:0:1 sdb 8:16 [active][ready] \_ 4:0:0:1 sdl 8:176 [active][ready] \_ round-robin 0 [prio=2][enabled] \_ 3:0:1:1 sdg 8:96 [active][ready] \_ 4:0:1:1 sdq 65:0 [active][ready] I have fdisk’ed the sbd (underlying) disk and rebooted
to bring multipath into sync. /dev/mpath now has the following entries lrwxrwxrwx 1 root root 7 Oct
25 11:53 mpath11 -> ../dm-0 lrwxrwxrwx 1 root root 7 Oct
25 11:53 mpath11p1 -> ../dm-9 /dev/mapper brw-rw---- 1 oracle oinstall 253, 4 Oct 25
11:53 mpath11 brw-rw---- 1 oracle oinstall 253, 5 Oct 25
11:53 mpath11p1 I have tried addressing the I have specified the raw devices /etc/sysconfig/rawdevices using
the major minor id’s /dev/raw/raw5 253 5 However when trying to exchange data between the shared luns Dd if=/etc/hosts of=/dev/raw/raw5 I am getting an error. However if I do the following dd if=/etc/hosts
of=/dev/mpath/mpath11p1 the transfer works successfully. This has come about as each of the servers is reporting the
/mpath’s back as different numbers. The /dev/dm-1 etc are all fine, how
do I bring the mpath back into sync, e.g. mpath1 across all boxes. Also am I
going about things the right way or fundamentally flawed? Regards Charles Batchelor Charles Batchelor Senior Technical Specialist + Herald and Times Group
( Tel: 0141 - 302 7011
Fax: 0141 - 302 7901 Please take the time to fill out the IT Satisfaction survey form
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