[dm-devel] Fdisk Multipath Disks on NetApp / IBM N series SAN with intention for Oracle 10G RAC OCR and Voting Disks
Charles Batchelor
Charles.Batchelor at glasgow.newsquest.co.uk
Thu Oct 25 12:28:29 UTC 2007
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
200 Renfield Street
Glasgow G2 3QB
Scotland
* Tel: 0141 - 302 7011
Fax: 0141 - 302 7901
* Email: charles.batchelor at glasgow.newsquest.co.uk
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