[ML-General] hardware RAID

[david]

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.

Thanks,
David




On 06/11/15 16:24, Brian Oborn wrote:
> 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.
>
> Brian Oborn (bobbytables)
>
> On Thu, Jun 11, 2015 at 4:16 PM, Joshua Pritt <ramgarden at gmail.com 
> <mailto:ramgarden at gmail.com>> wrote:
>
>     I've had good experience with my Promise RAID controller and
>     Promise 4 drive enclosure.
>
>     Enclosure:
>     http://www.bhphotovideo.com/c/product/802836-REG/Promise_Technology_SUPERSWAP_4600_BEIGE_Internal_SuperSwap_4600_SAS_SATA.html
>
>     Controller:
>     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
>
>     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!)
>
>     Of course if I had to start over I'd just get a Drobo so I could
>     throw any size hard drives at it:
>     https://www.youtube.com/watch?v=6VGR8JAij0s
>
>     http://www.drobo.com/
>
>
>
>
>     On Thu, Jun 11, 2015 at 5:06 PM, david <ainut at knology.net
>     <mailto:ainut at knology.net>> wrote:
>
>         I haven't kept up.  What do you guys recommend for SATA
>         internal raid controllers?
>         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.
>         I'm hoping that the 3 striped disks can be converted to the
>         hardware controller without problems (6 terabyte.)
>         The set of 2 that *should* be identical, can be made identical
>         with dd, if I must before attaching them to the hardware
>         controller.
>
>         So, advice?
>
>         Thanks,
>         David Merchant
>
>
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