A little extra info:
ZFS brings in a ZFS spare device the next time the pool is accessed, not
a raidbox hot spare. Resilvering starts automatically and increases disk
access times by about 30%. The first hour of estimated time left ( for
5-6 TB pools ) is wildly inaccurate, but it starts to settle down after
that.
Tom Mooney
Dan Pritts wrote:
On Fri, Nov 16, 2007 at 11:31:00AM +0100, Paul Boven wrote:
Thanks for your reply. The SCSI-card in the X4200 is a Sun Single
Channel U320 card that came with the system, but the PCB artwork does
sport a nice 'LSI LOGIC' imprint.
That is probably the same card i'm using; it's actually a "Sun" card
but as you say is OEM by LSI.
So, just to make sure we're talking about the same thing here - your
drives are SATA,
yes
you're exporting each drive through the Western
Scientific raidbox as a seperate volume,
yes
and zfs actually brings in a
hot spare when you pull a drive?
yes
OS is Sol10U4, system is an X4200, original hardware rev.
Over here, I've still not been able to accomplish that - even after
installing Nevada b76 on the machine, removing a disk will not cause a
hot-spare to become active, nor does resilvering start. Our Transtec
raidbox seems to be based on a chipset by Promise, by the way.
I have heard some bad things about the Promise RAID boxes but I haven't
had any direct experience.
I do own one Promise box that accepts 4 PATA drives and exports them to a
host as scsi disks. Shockingly, it uses a master/slave IDE configuration
rather than 4 separate IDE controllers. It wasn't super expensive but
it wasn't dirt cheap, either, and it seems it would have cost another
$5 to manufacture the "right way."
I've had fine luck with Promise $25 ATA PCI cards :)
The infortrend units, on the other hand, I have had generally quite good
luck with. When I worked at UUNet in the late '90s we had hundreds of
their SCSI RAIDs deployed.
I do have an Infortrend FC-attached raid with SATA disks, which basically
works fine. It has an external JBOD also SATA disks connecting to
the main raid with FC. Unfortunately, The RAID unit boots faster than
the JBOD. So, if you turn them on at the same time, it thinks the JBOD
is gone and doesn't notice it's there until you reboot the controller.
That caused a little pucker for my colleagues when it happened while i
was on vacation. The support guy at the reseller we were working with
(NOT Western Scientific) told them the raid was hosed and they should
rebuild from scratch, hope you had a backup.
danno
--
Dan Pritts, System Administrator
Internet2
office: +1-734-352-4953 | mobile: +1-734-834-7224
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