[Beowulf] Big storage
ballen at gravity.phys.uwm.edu
Wed Sep 5 02:25:48 PDT 2007
>> In a system with 24 x 500 GB disks, I would like to have usable storage of
>> 20 x 500 GB and use the remaining disks for redundancy. What do you
>> recommend? If I understand correctly I can't boot from ZFS so one or more
>> of the remaining 4 disks might be needed for the OS.
> This is (in my opinion) probably the only real issue with the X4500.
> The system disk(s) must be with the data disks (since there are "only"
> 48 disks slots) and the two bootable disks are on the same controller
> which effectively make this controller a single point of failure (there
> are easy ways to move the second system disk to another controller, but
> you still need a working "first" controller to boot).
Can you boot from a USB device? You can have an inexpensive RAID-1 USB
device for the root and OS.
> Although in our experience, controller failures are rare on the X4500
> (one failure in over a year with a few tens of X4500).
Did you lose data with a controller failure? I assume can you just move
the 48 disks to another box.
It will take me some time to digest your other comments. But I made a
mistake in what I wrote. I want to have a 48 disk box with 500 GB disks.
>From this (raw) 24 TB of storage I want to get 20 TB usable (eg, lose no
more than 8 disks of the 40 for redundancy and the OS). I mistakenly
wrote 20/24 disks and 10 TB in my email. How would you revise your
recommendations for 20TB of usable storage?
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