Re: [CentOS] more software raid questions

2010-10-25 Thread Scott Silva
on 10-21-2010 9:13 AM fred smith spake the following: On Thu, Oct 21, 2010 at 08:59:13AM -0700, Nataraj wrote: fred smith wrote: On Tue, Oct 19, 2010 at 07:34:19PM -0700, Nataraj wrote: I've seen this kind of thing happen when the autodetection stuff misbehaves. I'm not sure why it does

Re: [CentOS] more software raid questions

2010-10-21 Thread Nataraj
fred smith wrote: On Tue, Oct 19, 2010 at 07:34:19PM -0700, Nataraj wrote: I've seen this kind of thing happen when the autodetection stuff misbehaves. I'm not sure why it does this or how to prevent it. Anyway, to recover, I would use something like: mdadm --stop /dev/md125 mdadm

Re: [CentOS] more software raid questions

2010-10-21 Thread fred smith
On Thu, Oct 21, 2010 at 08:59:13AM -0700, Nataraj wrote: fred smith wrote: On Tue, Oct 19, 2010 at 07:34:19PM -0700, Nataraj wrote: I've seen this kind of thing happen when the autodetection stuff misbehaves. I'm not sure why it does this or how to prevent it. Anyway, to recover,

Re: [CentOS] more software raid questions

2010-10-21 Thread Nataraj
fred smith wrote: Thanks for the additional information. I'll try backing up everything this weekend then will take a stab at it. someone said earlier that the differing raid superblocks were probably the cause of the misassignment in the first place. but I have no clue how the superblocks

Re: [CentOS] more software raid questions

2010-10-21 Thread Nataraj
Nataraj wrote: fred smith wrote: Thanks for the additional information. I'll try backing up everything this weekend then will take a stab at it. someone said earlier that the differing raid superblocks were probably the cause of the misassignment in the first place. but I have no clue

Re: [CentOS] more software raid questions

2010-10-21 Thread Nataraj
Nataraj wrote: Nataraj wrote: fred smith wrote: Thanks for the additional information. I'll try backing up everything this weekend then will take a stab at it. someone said earlier that the differing raid superblocks were probably the cause of the misassignment in the first

Re: [CentOS] more software raid questions

2010-10-20 Thread fred smith
On Tue, Oct 19, 2010 at 07:34:19PM -0700, Nataraj wrote: fred smith wrote:helppain/backups/disks/ hi all! back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to

Re: [CentOS] more software raid questions

2010-10-20 Thread Rob Kampen
fred smith wrote: On Tue, Oct 19, 2010 at 07:34:19PM -0700, Nataraj wrote: fred smith wrote:helppain/backups/disks/ snip Well, I've already tried to use --fail and --remove on md125 and md126 but I'm told the members are still active. mdadm /dev/md126 --fail

Re: [CentOS] more software raid questions

2010-10-20 Thread Rudi Ahlers
On Wed, Oct 20, 2010 at 4:34 AM, Nataraj incoming-cen...@rjl.com wrote: When I create my Raid arrays, I always use the option --bitmap=internal. With this option set, a bitmap is used to keep track of which pages on the drive are out of date and then you only resync pages which need updating

Re: [CentOS] more software raid questions

2010-10-20 Thread Rob Kampen
Rudi Ahlers wrote: On Wed, Oct 20, 2010 at 4:34 AM, Nataraj incoming-cen...@rjl.com wrote: When I create my Raid arrays, I always use the option --bitmap=internal. With this option set, a bitmap is used to keep track of which pages on the drive are out of date and then you only resync pages

[CentOS] more software raid questions

2010-10-19 Thread fred smith
hi all! back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to have happened just a few mins ago, upon rebooting after a small update. I received four emails like this,

Re: [CentOS] more software raid questions

2010-10-19 Thread Rob Kampen
fred smith wrote: hi all! back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to have happened just a few mins ago, upon rebooting after a small update. I received four

Re: [CentOS] more software raid questions

2010-10-19 Thread Tom H
On Tue, Oct 19, 2010 at 7:59 PM, fred smith fre...@fcshome.stoneham.ma.us wrote: back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to have happened just a few mins

Re: [CentOS] more software raid questions

2010-10-19 Thread Nataraj
fred smith wrote:helppain/backups/disks/ hi all! back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to have happened just a few mins ago, upon rebooting after a

Re: [CentOS] more software raid questions

2010-10-19 Thread Nataraj
Nataraj wrote: I've seen this kind of thing happen when the autodetection stuff misbehaves. I'm not sure why it does this or how to prevent it. Anyway, to recover, I would use something like: mdadm --stop /dev/md125 mdadm --stop /dev/md126 If for some reason the above commands fail,