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20h
comment How to get Microsoft license authentication for all machines on a network?
@longneck that is simply not the case. I'm aware of several companies under the same agreements who haven't been audited at all and the difference between which get audited is very clearly down to common usage patterns. Not blanket regular audits and not random either. Unless you have any kind of documentation to link to that says otherwise, I'll trust my first hand experience over your assumptions.
22h
comment How to get Microsoft license authentication for all machines on a network?
Microsoft don't just audit companies regularly, these are triggered based on info they are getting back when you activate or use products. Its worth insuring that there is no accidental key reuse through cloning, lots of stuff being activated under MSDN, etc. that may be confused for signs of possible piracy.
1d
comment Rotate entire disk set in RAID0 array?
Not to mention, removing harddrives and transporting them about is the quickest way to cause a failure.
Apr
21
comment Juniper SSG Port Forwarding over a Site-to-Site VPN
I think it would simplify matters if the VIP on router B should point to the PBX in the A subnet, not try to point to a 2nd VIP on router A. Also sounds like your tunnel routing is not quite right, remember the policies apply to zones, so won't apply to traffic that isn't from that zone. Also you should have fallback null policies so that it doesn't send traffic out over the wan when the tunnel is down!
Apr
13
comment ESXi 5.1 lost connection to Datastore, but not to Disk
You don't have raid or a recent backup? You should have both.
Apr
11
awarded  Popular Question
Apr
9
answered Why are Large Form Factor (LFF) disks still fairly prevelant?
Mar
16
comment Why is RAID 1+6 not a more common layout?
Since you are proposing an untested theory that defies conventional wisdom why don't you detail your setup where you have shown it to work? I would guess that since your maths differs from every other source on this subject as well as real world tests the reason why it doesn't work is that your maths is wrong.
Mar
15
comment Why is RAID 1+6 not a more common layout?
Please state your source for this information. A practical test with large or tiny writes does not concur with the performance you have suggested.
Mar
13
comment Building one big filesystem with JBOD and ZFS
you almost certainly don't actually want one big filesystem
Mar
12
comment Why is RAID 1+6 not a more common layout?
You stated based on your calculations that RAID1+6 has the same write throughput as RAID10 with triples. In reality RAID1+6 has not even remotely the write throughput of RAID10 so your calculations or the assumptions they are based on are wrong. I was trying to help you understand why, if you refuse to listen then we might be wasting our time but it is you who is wasting it.
Mar
12
comment Why is RAID 1+6 not a more common layout?
I think basically you have read someone generalising the throughput calculation and are trying to apply it as if it is a rule when it isn't. And it certainly doesn't work for nested situations that are multiplicative.
Mar
12
comment Why is RAID 1+6 not a more common layout?
you don't get 4 chunks written for the price of one. Throughput per drive is dependent on the amount of data, so that has already been cancelled out. The number of reads does not depend on chunksize, it is always required to calculate parity. It might be helpful if you linked where you are getting these ideas from.
Mar
12
comment Why is RAID 1+6 not a more common layout?
I think you are quoting something without understanding it. What you are saying specifically about write amplification is technically correct only because RAID6 requires 3 writes the same as a 2nd mirror. But what you are missing is that parity in RAID6 also requires reads. The disk IOs limit throughput, not just the disk writes.
Mar
12
comment Why is RAID 1+6 not a more common layout?
no writing 4 chunks at once does not magically increase drive throughput by 4 :) Less than optimal chunksize can only lower throughput from the theoretical maximum.
Mar
12
comment Why is RAID 1+6 not a more common layout?
no that is incorrect. Each RAID6 write takes 6 IOs and each RAID1 write takes 2 IOs, these are multiplicative. So in RAID 1+6 each write will take 12 IOs, for RAID 10 is it 2 IOs. Write throughput on 12 drives will be 1x for RAID1+6 and 6x for RAID10!
Mar
11
comment Why is RAID 1+6 not a more common layout?
Your thoughput calc doesn't seem to have taken into account the write amplification to create the parity.
Feb
25
comment Duplicate MAC address, can be blocked?
If someone is spoofing a mac address on a physical network they wouldn't need to make a seperate dhcp request.
Feb
19
comment How to protect against loss of server on a budget
@warren the difference is how that is implemented. Do they just have a bunch of VMs on a physical machine or do they have a bunch of VMs on a pool of physical machines.
Feb
14
comment Removing an (apparently) infinitely recursive folder
The fact that it wasn't actually infinately recursive but just very deep is significant and was a major red herring assumption.