[mythtv-users] OT Help: mdadm segfault

[Steve MacLaren]

On 9/18/07, George Mari <george_mythusers at mari1938.org> wrote:
>
> Steve MacLaren wrote:
> > On 9/17/07, George Mari <george_mythusers at mari1938.org> wrote:
> >>
> >>
> >> Please post the output of each of the following:
> >>
> >> mdadm --examine /dev/sda1
> >> mdadm --examine /dev/sdb1
> >> mdadm --examine /dev/sdc1
> >> mdadm --examine /dev/sdd1
> >>
> >> I'm guessing that /dev/sda1 will report no valid info or some such, but
> >> if the other 3 drives all have same/similar values for the 'events'
> >> field, you should be able to recover.
> >
> >
> > Here's what I get:
> >
> > /dev/sda1:
> >           Magic : a92b4efc
> >         Version : 00.90.00
> >            UUID : bc7a4d90:bd286a91:c109596b:d7e29b7e
> >   Creation Time : Mon May  7 21:31:55 2007
> >      Raid Level : raid5
> >     Device Size : 488383872 (465.76 GiB 500.11 GB)
> >      Array Size : 1465151616 (1397.28 GiB 1500.32 GB)
> >    Raid Devices : 4
> >   Total Devices : 4
> > Preferred Minor : 0
> >
> >     Update Time : Wed Sep 12 15:58:54 2007
> >           State : active
> >  Active Devices : 4
> > Working Devices : 4
> >  Failed Devices : 0
> >   Spare Devices : 0
> >        Checksum : 66008fbc - correct
> >          Events : 0.161
>
> Do all the other drives have the same value for this field above,
> "Events"? (Are they all 0.161?)  If all four are the same, then the data
> on your array is intact.  If at least three of the four are the same,
> you will be able to re-build the array from the three good drives.  The
> one that has a different value got kicked out of the array.
>
> >
> >          Layout : left-symmetric
> >      Chunk Size : 128K
> >
> >       Number   Major   Minor   RaidDevice State
> > this     0       8        1        0      active sync   /dev/sda1
> >
> >    0     0       8        1        0      active sync   /dev/sda1
> >    1     1       8       17        1      active sync   /dev/sdb1
> >    2     2       8       33        2      active sync   /dev/sdc1
> >    3     3       8       49        3      active sync   /dev/sdd1
> >
>
> So what this above says is, "according to the superblock info on *this*
> drive, the state of each drive in the array is 'active sync'".
>
> When you do mdadm --examine /dev/sd*1 on each of the other three drives,
> if they all report the same information (all drives 'active sync') your
> array is fine.
>
> If this is the case, I agree with the other poster that you may have a
> hardware problem elsewhere, such as power supply.
>
> Of course, even if the array does have a problem with one drive, it
> still could be that something like a power supply problem could be
> causing your array to fail.
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Yes, all four of the "Events" fields came up as 0.161.  And the states were
all active sync.  So we'll give a new PSU a try-
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