> -----Original Message----- > From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list- > bounces@xxxxxxxxxx] On Behalf Of sunhux G > Sent: 20 May 2008 11:05 > To: General Red Hat Linux discussion list > Subject: Re: Hi Hertha,How to find out minor device of a major device (for > entry inrawdevices file) > > Hi Hertha/anyone else, > > > Thanks, there's actually four paths > (as 2 SAN switches x 2 fibre cables = 4 possible paths). > > > Just four more questions : > > > b) I can use fdisk /dev/mpath/mpathx, select "p" (partition) to > find out the disk capacity of each of the logical mpathx > device. However, "df -k /dev/mpath/mpathx" will not show > the true capacity. If I have more than 10 of those logical > devices, this is going to be tedious. Is there a faster/shorter > way to find out the capacities? My multipath output looks like this: [root@server ~]# multipath -l repdb_or_sup_failoverdb (350003ac0144e024a) dm-7 3PARdata,VV [size=500G][features=0][hwhandler=0] \_ round-robin 0 [prio=0][active] \_ 0:0:0:1 sda 8:0 [active][undef] \_ 1:0:0:1 sdb 8:16 [active][undef] which does show size. Don't know whether this data is available for all types of sans but worth while testing. You can use grep and friends to easily extract data. > > c) if one of the four paths is broken for some reason, I suppose > that's when "multipath -ll" will show one path less. How > can I find out which path needs replacement/fixing when > this happens? multipath will show one of the paths as inactive. Its been a while since I looked at our san stuff so I am typing from memory. As for determining which path is broken I would be interested in the answer too as I cant find it in my notes and I di think it was in there. > > d) Last question is probably a SAN (Netapp) question : > how can I find out from Linux end, which physical disk in > the SAN is faulty This will be specific to the type of san you are using and most likely you would be using there specific tools to determine this. Regards -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
