Al Hopper wrote:
I really can't experiment with this particular machine, because its my
main desktop that drives a 22" and 30" LCDs, has about 18 Gnome workspaces
and 80+ windows active. If the Xserver dies it take 10 to 15 minutes just
to get everything setup again so that I can get my productive development
environment in place. And that is aside from the ZFS mirrored pool on the
machine that has 45+ filesystems and 6 zones defined. So - experimenting
with it is not possible for now. ... more below ...
Ok, I can understand.
Another question is if you are using ZFS on USB drives, the system hangs
due to non-usb related reason and you reset the box, can data integrity
on the USB drives be ensured?
Yet another question is if you are using non-USB drives, the system
hangs due to whatever reason and you reset the box, can data integrity
on the non-USB drives be ensured? And how, by SW or HW?
We need to think of the questions and make clear if such kind of data
loss is particular to USB or not before coming to a conclusion too quickly.
The only conclusion I've reached is that attaching 6 or 8 750Gb disk
drives via USB for use as ZFS pool is not a good idea - because USB is not
robust enough to guarantee, that in the event of a USB failure or "event",
that no more than one disk configured in a raidz configuration will be
negatively impacted. If more than one disk drive in a raidz storage
pool is negatively impacted, then you'll loose the entire pool. USB is
not an appropriate bus to support that type of usage scenario IMHO.
USB is fine as a demonstrator of ZFS capabilities by connecting multiple
USB flash drives (as I've done) and can also be used as a way to archive
files reliably on a removable media (the flash drives). And using ZFS
with flash drives solves the problem of corrupted or bad sectors on
low-cost flash drives - which may or may not have been 100% tested before
they were sold.
So do you think it is a limitation native to USB bus or it is caused by
Solaris defects? I don't play much with other types of disks. Why are
other types of disks robust than USB? Is it ensured by different
hardware technology?
Thanks,
Sophia
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