raid10 messed up by false multipath setup (was: raid10 messed up filesystem, lvm lv ok)

2008-01-21 Thread Ask Bjørn Hansen
On Jan 19, 2008, at 3:44 AM, Ask Bjørn Hansen wrote: Replying to myself with an update, mostly for the sake of the archives (I went through the linux-raid mail from the last year yesterday while waiting for my raw-partition backups to finish). I mentioned[1] my trouble with the multipath

Re: mdadm error when trying to replace a failed drive in RAID5 array

2008-01-21 Thread Ask Bjørn Hansen
On Jan 20, 2008, at 1:21 PM, Steve Fairbairn wrote: So the device I was trying to add was about 22 blocks too small. Taking Neils suggestion and looking at /proc/partitions showed this up incredibly quickly. Always leave a little space in the end; it makes sure you don't run into that

Re: One Large md or Many Smaller md for Better Peformance?

2008-01-21 Thread Ask Bjørn Hansen
On Jan 20, 2008, at 2:18 PM, Bill Davidsen wrote: One partitionable RAID-10, perhaps, then partition as needed. Read the discussion here about performance of LVM and RAID. I personally don't do LVM unless I know I will have to have great flexibility of configuration and can give up

2.6.22.16 MD raid1 doesn't mark removed disk faulty, MD thread goes UN

2008-01-21 Thread Mike Snitzer
Under 2.6.22.16, I physically pulled a SATA disk (/dev/sdac, connected to an aacraid controller) that was acting as the local raid1 member of /dev/md30. Linux MD didn't see an /dev/sdac1 error until I tried forcing the issue by doing a read (with dd) from /dev/md30: Jan 21 17:08:07 lab17-233

Re: idle array consuming cpu ??!!

2008-01-21 Thread Carlos Carvalho
Neil Brown ([EMAIL PROTECTED]) wrote on 21 January 2008 12:15: On Sunday January 20, [EMAIL PROTECTED] wrote: A raid6 array with a spare and bitmap is idle: not mounted and with no IO to it or any of its disks (obviously), as shown by iostat. However it's consuming cpu: since reboot it used

Re: One Large md or Many Smaller md for Better Peformance?

2008-01-21 Thread Carlos Carvalho
Moshe Yudkowsky ([EMAIL PROTECTED]) wrote on 20 January 2008 21:19: Thanks for the tips, and in particular: Iustin Pop wrote: - if you download torrents, fragmentation is a real problem, so use a filesystem that knows how to preallocate space (XFS and maybe ext4; for XFS use

Re: 2.6.22.16 MD raid1 doesn't mark removed disk faulty, MD thread goes UN

2008-01-21 Thread Mike Snitzer
cc'ing Tanaka-san given his recent raid1 BUG report: http://lkml.org/lkml/2008/1/14/515 On Jan 21, 2008 6:04 PM, Mike Snitzer [EMAIL PROTECTED] wrote: Under 2.6.22.16, I physically pulled a SATA disk (/dev/sdac, connected to an aacraid controller) that was acting as the local raid1 member of