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<div class="moz-cite-prefix">On 06/12/15 10:57, Hunter Fuller wrote:<br>
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cite="mid:CALizV5Xp_HjmcbsOLFvwpNNBeUCq8=ajiXtbDkF5VqdJX8RADg@mail.gmail.com"
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<p dir="ltr">All, </p>
<p dir="ltr">There are a couple of things still to be addressed
here...</p>
<p dir="ltr"> - David, why did your md raid fail? This should
never ever ever ever ever happen. Maybe it didn't fail and the
differences you see are in the metadata and boot loader...? I
hope that is the case. There's no reason for a md raid 1 to not
mirror. If you have that problem, you may have much bigger
problems. Such as a failing disk, controller, or something.</p>
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Hardware was ok.<br>
The system booted, ran everything fine, and worked ok, just not as I
*wanted.* When I examined the two drives from a live CD boot, disk
2 (the actual mirror) was NOTHING like disk 1. I want identical
disks, from cylinder 0, track 0, byte 0, all the way to the end of
the disk. Like I said, immediate fail-over capability, with maybe a
boot in between if necessary. mdadm did not do that. There was an
extra partition up front on the mirror, no boot partition at all on
the mirror, and no swap at all. I was not a happy camper. Worse,
when I unplugged the 2nd disk, the first disk would not even boot!
Bah. I tried with mdadm on and with it off while trying to boot the
first disk alone. (I was going to dd the entire first disk to the
second if those tests worked but they didn't.) Absolutely none of
the standard disk programs would fix it either, so I had to re-init
the first disk, and lost everything on it because I was so
frustrated at the point I didn't want to do a full backup. Turns
out, the "mirror" disk would not recover no matter what I tried.
So, in absolute frustration, I dd'ed zero's to the first 3 million
bytes of the mirror disk. Then, I could init the 2nd disk and use
it as normal, no RAID. So I am now looking into hardware RAID, to
see if I can get what I want to happen. :)<br>
<br>
Do you guys know of an intermediate level Linux (or free Winblows)
tool to show me summaries of the superblock, partitions, and etc,
AND allow me to adjust them with a little finesse instead of the dd
bulldozer?<br>
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<blockquote
cite="mid:CALizV5Xp_HjmcbsOLFvwpNNBeUCq8=ajiXtbDkF5VqdJX8RADg@mail.gmail.com"
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<p dir="ltr"> - I'm as big of a zfs fanboy as anyone. But
remember, you NEED error corrected ram to run zfs! The chances
of a<span>
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<<<snip>>><br>
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<div>Oh and with ZFS you can use different size drives but
you waist a good amount of space when you do that. </div>
<div>And lastly be sure to schedule scrubs of your drives
and do it in a way that the scrub will not occur while a
long smart test is running. That can cause problems.</div>
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</span>Can I ask what type of problems?<br>
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<div>According to the forums. "It isnt able to handle a
scrub, offline test and normal traffic well." <br>
<a moz-do-not-send="true"
href="https://forums.freenas.org/index.php?threads/scrub-and-smart-testing-schedules.20108/"
target="_blank">https://forums.freenas.org/index.php?threads/scrub-and-smart-testing-schedules.20108/</a><br>
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<div>Sounds like performance. The guy who made the post
(cyberjock) is one of their forum admins and he has
helped me with some difficult questions so I trust his
opinion. <br>
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<div> </div>
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<div dir="ltr"><span><font color="#888888">
<div>-Kirk</div>
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Seems like it would be very unwise to run scrub and s.m.a.r.t. tests
on a live disk! That would have to be one very intelligent
controller, probably with a very large cache.<br>
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