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List:       evms-devel
Subject:    Re: [Evms-devel] External HDD's with Softare RAID 1 questions
From:       Jer Jackson <jerj () coplanar ! net>
Date:       2003-06-24 15:13:37
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On Wed, 2003-06-18 at 16:01, Alexander Burker wrote:
> Hi!
> 
> I am currently running kernel 2.4.20 with evms+xfs+ieee1394 patches
> 
> I have two Maxtor Personal Storage 5000DV devices connected over
> Firewire to my Server and there are three software RAID 1 partitions
> on the HDs. These partitions are evms volumes.
> 
> I'd like to be able to connect and disconnect this two devices during
> the server is running.
> 
> What works:
> 
> Connecting the two disk using ieee1394, ohci1394 and sbp2 driver.
> Discover the two disks on the scsi bus using scsi add-single-device .
> Starting evms using evms_activate.
> Working with the RAID devices.
> Closing down evms with evms_deactivate.
> (But RAID 1 devices are still running : cat /proc/mdstat)
> 
> [root@mm557424l /]# cat /proc/mdstat
> Personalities : [linear] [raid0] [raid1] [raid5] [multipath]
> read_ahead 1024 sectors
> md2 : active raid1 [dev fe:18][1] [dev fe:15][0]
>       81931392 blocks [2/2] [UU]
> 
> md1 : active raid1 [dev fe:16][0] [dev fe:17][1]
>       4096448 blocks [2/2] [UU]
> 
> md0 : active raid1 [dev fe:10][0] [dev fe:11][1]
>       4096448 blocks [2/2] [UU]
> 
> unused devices: <none>
> [root@mm557424l /]#
> 
> 
> What doesn't work:
> The evms software automatically starts the 3 sofware RAID 1 on the HD's,
> How can I prevent this (e.g. If two disks fail and I will have to handle
> this correct)?
> 
> How to only activate the External HDs if evms already running?
> How to only deactivate the External HDs if I need evms for other devices
> in the system?
> 
> How to make a raidstop with evms devices??????????????????????
> raidstop complains for an /etc/raidtab enry but what device names
> should I write there?!?!?!?!)

For raidstop, you don't need anything *in* /etc/raidtab
Make an empty /etc/raidtab.   eg: touch /etc/raidtab
then use the mdX names like:

raidstop /dev/md0

I use this to allow md raid1 in a cluster private container.

Regards,

Jeremy
> 
> With standard md devices I can do a raidstart and raidstop for single
> sofware raid HOW TO DO THIS WITH evms RAIDs???????????????????
> How can I make a raidhotadd with some kind of failed-disk option?
> (e.g. the power supply for both external disks goes down and I have two
> unclean RAID superblocks on the two RAID 1 devices!)
> 
> Are there some config scripts like /etc/raidtab for evms?
> 
> best regards,
> alex burker
> 
> 
> 
> 
> 
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