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Software Linux raid is fine with the striping but it sucks at
mirroring. The second (mirror) drive is NOT identical in any shape
form or fashion. Even the partitions are different. And it is not
bootable!!! In mirroring, I want immediate fail-over, or at most,
one shutdown, remove/replace drive, then back up right where I was.<br>
<br>
Thanks,<br>
David<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 06/11/15 16:24, Brian Oborn wrote:<br>
</div>
<blockquote
cite="mid:CAFtQAgTsndKnGh76g2=t1xukneraz6-RxV0yFzbkAj9z8ES__w@mail.gmail.com"
type="cite">
<div dir="ltr">I swear by Linux software RAID. At my previous job
we had some problems with hardware RAID controllers, so I
started using the software RAID and never looked back. Remember
that you also have to plan for recovery if the controller bites
the dust, whereas with software RAID you can use any other linux
machine. Finally, if you possibly can run RAID10 instead of
RAID5/6 (or LVM and bunch of RAID1 pairs). You'll get much
better performance and resiliency, especially with small reads
and writes.
<div><br>
</div>
<div>Brian Oborn (bobbytables)</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Jun 11, 2015 at 4:16 PM, Joshua
Pritt <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ramgarden@gmail.com" target="_blank">ramgarden@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I've had good experience with my Promise RAID
controller and Promise 4 drive enclosure.
<div><br>
</div>
<div>Enclosure:<br>
<div><a moz-do-not-send="true"
href="http://www.bhphotovideo.com/c/product/802836-REG/Promise_Technology_SUPERSWAP_4600_BEIGE_Internal_SuperSwap_4600_SAS_SATA.html"
target="_blank">http://www.bhphotovideo.com/c/product/802836-REG/Promise_Technology_SUPERSWAP_4600_BEIGE_Internal_SuperSwap_4600_SAS_SATA.html</a><br>
</div>
<div><br>
</div>
<div>Controller:</div>
<div><a moz-do-not-send="true"
href="http://www.ebay.com/itm/Promise-FastTrak-S150-SX-4-SATA-RAID-5-Controller-Card-256MB/261817055986?_trksid=p2141725.c100338.m3726&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20141212152715%26meid%3D806b1dd81ce74c518c631a78f60414f7%26pid%3D100338%26rk%3D13%26rkt%3D28%26sd%3D271894688538"
target="_blank">http://www.ebay.com/itm/Promise-FastTrak-S150-SX-4-SATA-RAID-5-Controller-Card-256MB/261817055986?_trksid=p2141725.c100338.m3726&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20141212152715%26meid%3D806b1dd81ce74c518c631a78f60414f7%26pid%3D100338%26rk%3D13%26rkt%3D28%26sd%3D271894688538</a><br>
</div>
<div><br>
</div>
<div>I have four 250 GB drives in there now for 750 GB
but I've had those in there for many years. I've
already had one drive fail over the years and easily
hot swapped it for another 250 GB drive and it brought
it all back up without stopping the computer at all
(just like it's meant to!)</div>
<div><br>
</div>
<div>Of course if I had to start over I'd just get a
Drobo so I could throw any size hard drives at it:</div>
<div><a moz-do-not-send="true"
href="https://www.youtube.com/watch?v=6VGR8JAij0s"
target="_blank">https://www.youtube.com/watch?v=6VGR8JAij0s</a><br>
</div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://www.drobo.com/" target="_blank">http://www.drobo.com/</a><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
<div class="HOEnZb">
<div class="h5">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Jun 11, 2015 at 5:06
PM, david <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ainut@knology.net" target="_blank">ainut@knology.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">I
haven't kept up. What do you guys recommend for
SATA internal raid controllers?<br>
I have a stack of 3 in striped (raid 0?) and a
stack of 2 in raid 5. Both sets were configured
to use software raid under Linux but the raid 5
did not turn out to really be mirrored drives.
Bah.<br>
I'm hoping that the 3 striped disks can be
converted to the hardware controller without
problems (6 terabyte.)<br>
The set of 2 that *should* be identical, can be
made identical with dd, if I must before attaching
them to the hardware controller.<br>
<br>
So, advice?<br>
<br>
Thanks,<br>
David Merchant<br>
<br>
<br>
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