Hello,
we are using VSF 5.0 MP3 on Solaris 10 attached to SAN-based hardware array.
On this array we have created 2 raid groups and on each RG we have created
a few LUNs:
raid group: RG1RG2
LUN1 LUN7
LUN2 LUN8
LUN3 LUN9
LUN4
VM views the two raid groups as single LUNs. It needn't be concerned with
the layout of each raid group. To change from 2 columns to 4 columns use the
relayout option to vxassist and also specify the two new LUNs on which to
place the two new columns.
That being said, the ISP feature of VM would
the ISP feature of VM would allow you to drill down to individual spindles and
place subdisks on each spindle.
Individual spindles of the RAID group? Doesn't that defeat the purpose of the
RAID group?
Striping across LUNs gets ...interesting; we usually just use them concat. Of
course that's
Striping across Enterprise LUNs allows you to use more SCSI queues/transaction,
and follow the template of setting the number of read/write threads to the
number of stripe cols, and have it work efficiently, amongst other arguments
for the config.
Not everyone needs this configuration, but
Yes, it certainly does. And that is why Symantec put the feature in the VM
product; to use host-based software to construct and control storage from
host to physical disk. This would help eliminate multi-vendor chaos in the
storage aspects of the data center.
On Wed, Jan 6, 2010 at 12:19 PM,
So indeed this feature turns your $$$ Hitachi 9990V into a JBOD.
Wow. I guess there are products that need this sort of thing.
And enterprises where the people running the SAN array can't manage it properly
so the server administrators have need of bypassing them.
The other question of SCSI
So, assume your queue depth is 10, and you need a 1TB volume. You can
present a 1TB LUN, and your whole SCSI queue for that volume is 10. If
you present 2 500GB LUNs, your combined SCSI queue is 20 - one SCSI
mailbox per LUN. If you present 10 100GB LUNs, you get a combined queue
of 100. If
