@JaredBusch said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

1990s there were still garbage services

I do remember that I was not able to change the SNM on an old HP jetdirect print server that we had connected to some dot matrix printers via centronics connectors. It was 10base-T and also had a BNC connector on it.

Yeah, 10Base-T and BNC was early 1990s. By 1997 we were already way, way past that stuff even in small, cheap deployments.

I finally got to retire that thing last year.

What? WTF was it hooked to?

They make BNC to RJ 45 adapters

This one actually had both connectors. I just used the RJ45.

Edit: It was similar to this one, but mine had 3 parallel ports.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

1990s there were still garbage services

I do remember that I was not able to change the SNM on an old HP jetdirect print server that we had connected to some dot matrix printers via centronics connectors. It was 10base-T and also had a BNC connector on it.

Yeah, 10Base-T and BNC was early 1990s. By 1997 we were already way, way past that stuff even in small, cheap deployments.

I finally got to retire that thing last year.

What? WTF was it hooked to?

A dot matrix printer that printed checks from our ERP system. I got a brand new identical replacement printer (when the original one was dying) that had an ethernet port and the VAR couldn't get it to work properly. So, I had to end up connecting it back to the ancient directjet via centronics. My new switches didn't support 10Base-T, so I had to setup a 5-port switch and connect it to that. PITA.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

1990s there were still garbage services

I do remember that I was not able to change the SNM on an old HP jetdirect print server that we had connected to some dot matrix printers via centronics connectors. It was 10base-T and also had a BNC connector on it.

Yeah, 10Base-T and BNC was early 1990s. By 1997 we were already way, way past that stuff even in small, cheap deployments.

I finally got to retire that thing last year.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

1990s there were still garbage services

I do remember that I was not able to change the SNM on an old HP jetdirect print server that we had connected to some dot matrix printers via centronics connectors. It was 10base-T and also had a BNC connector on it.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@JaredBusch said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

In my DHCP scope (for a /22 subnet), I created several address pools which omit the network and broadcast addresses, so they won't be assigned.

Even if they are in scope, those two should never be able to be assigned. It would be a broken DHCP implementation that allowed it regardless. Since hitting the broadcast should cause all the machines to respond, it would wreak havoc with your system if that happened.

How many address pools did you make? There is only one network and broadcast number.

Like @Pete-S I use a /22. I was referring to what would be a traditional network and broadcast of a /24, of which there are a few. For instance, If I have a 192.168.0.0/22, it would span 192.168.0.0-192.168.3.255. I omit 192.168.0.255, 1.0, 1.255, 2.0, 2.255 and 3.0

That is wrong, those are not network or broadcast addresses in that subnet. They are simply network addresses for hosts.

Correct. I know that. I saw something a long time ago that said that some devices can't handle those, so I blocked them out. Don't remember where, but it didn't hurt.

Maybe in the late 1990s there were still garbage services that weren't IPv4 compatible yet. But that can't possibly be the case today, no one would be able to use those things.

That's good that is no longer a thing.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

Like @Pete-S I use a /22.

You use one, but are treating it like several spanned /24s. That's not how it works. You are thinking like it is the mid-1990s and there are still classes.

I know it isn't how it works. Initially, I said that some devices didn't like them.

@JaredBusch said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

In my DHCP scope (for a /22 subnet), I created several address pools which omit the network and broadcast addresses, so they won't be assigned.

Even if they are in scope, those two should never be able to be assigned. It would be a broken DHCP implementation that allowed it regardless. Since hitting the broadcast should cause all the machines to respond, it would wreak havoc with your system if that happened.

How many address pools did you make? There is only one network and broadcast number.

Like @Pete-S I use a /22. I was referring to what would be a traditional network and broadcast of a /24, of which there are a few. For instance, If I have a 192.168.0.0/22, it would span 192.168.0.0-192.168.3.255. I omit 192.168.0.255, 1.0, 1.255, 2.0, 2.255 and 3.0

That is wrong, those are not network or broadcast addresses in that subnet. They are simply network addresses for hosts.

Correct. I know that. I saw something a long time ago that said that some devices can't handle those, so I blocked them out. Don't remember where, but it didn't hurt.

@scottalanmiller said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

@wrx7m said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

In my DHCP scope (for a /22 subnet), I created several address pools which omit the network and broadcast addresses, so they won't be assigned.

Even if they are in scope, those two should never be able to be assigned. It would be a broken DHCP implementation that allowed it regardless. Since hitting the broadcast should cause all the machines to respond, it would wreak havoc with your system if that happened.

How many address pools did you make? There is only one network and broadcast number.

Like @Pete-S I use a /22. I was referring to what would be a traditional network and broadcast of a /24, of which there are a few. For instance, If I have a 192.168.0.0/22, it would span 192.168.0.0-192.168.3.255. I omit 192.168.0.255, 1.0, 1.255, 2.0, 2.255 and 3.0

In my DHCP scope (for a /22 subnet), I created several address pools which omit the network and broadcast addresses, so they won't be assigned.

@travisdh1 said in IOPS for SSD?:

@wrx7m said in IOPS for SSD?:

@Pete-S They dropped the price to 1061.24 since I posted. lol Interesting. Yes, but that is a max of 12 nvme. I may have misunderstood that option with 8 SAS/SATA. I am guessing that the max of 12 would allow for more SAS/SATA, although it doesn't mention it. My issue was also with the available drive capacities and cost per TB for spinning disks in the 2.5" spec.

Yeah, especially direct from the OEM. Have you thought about buying the storage from xByte instead?

Are their drives brand new? I did price out a server with specs as similar to Dell's as possible and it was only off by a couple grand.

@Pete-S said in Can I use the first IP in a subnet, for instance 192.168.0.0?:

Is it possible / bad practice to use the first address in the network, for instance 192.168.0.0 (netmask 255.255.255.0) ?

If I remember correctly a long time ago it wasn't possible but nowadays it is. I never use it but when you have small subnets like /29 it could be nice.

I have seen that it depends on the product that you are dealing with. Some might not like it when you use what is typically a network or broadcast address when you are supernetting.

@Pete-S They dropped the price to 1061.24 since I posted. lol Interesting. Yes, but that is a max of 12 nvme. I may have misunderstood that option with 8 SAS/SATA. I am guessing that the max of 12 would allow for more SAS/SATA, although it doesn't mention it. My issue was also with the available drive capacities and cost per TB for spinning disks in the 2.5" spec.

@scottalanmiller said in How to Stop an Ongoing RAID Rebuild HP P420i RAID Controller:

But they confused their UPS with their NAS calling both their "backup"

WOW.

@scottalanmiller said in How to Stop an Ongoing RAID Rebuild HP P420i RAID Controller:

@JaredBusch said in How to Stop an Ongoing RAID Rebuild HP P420i RAID Controller:

Shut the system down pull the failed drive and the hot spare turn it back on. You should be up and running on a degraded RAID array

We are terrified to turn the system off at this point.

I am guessing no backups? Is the system available at all?

@JasGot said in Streaming music for office (or anywhere):

Had a customer call and ask us to come and setup 10 Sonos speakers for their office. They said they picked them up because their overhead system was static-ee.

I assured them this was the wrong approach because commercial amps with 70v speakers don't just go bad all at once. It had to be FM reception.

It was. But they really wanted the Sonos so they could stream music. I told them this was silly because they already had a beautful sound system in place. They just needed a new source.

I installed a Nexum Tunebox2 https://www.nexum-design.com/tunebox2 for them and I have to say, it is truly sweet.

Use any smart device or PC or MAC to tell it what to stream, and then you can disconnect and it will sing forever. Of course it'll do other things too. But set and forget was the goal.

Just thought I'd share about this little box. $64 on amazon.

So, the static was at the source equipment, not the speakers?
Never mind. I re-read it.

@Pete-S said in IOPS for SSD?:

I'm interest in this myself as I have a customer that are looking at ESXi on Dell R740 servers with the same type of CPU that you have but with less storage capacity overall.

I just looked at the cost. You have to select a different chassis- "Chassis up to 24 x 2.5 Hard Drives including 24 NVME Drives, Max of 8 SAS/SATA" , which adds about $1300 bucks,
However, the 960GB nvme drive is only about $50 more than the 960 GB 12Gbps SAS drive I was looking at.

The problem for me, is that I can't get the storage density I need when using 2.5" drives. Also, it would cost quite a bit more if I could.

@Pete-S said in IOPS for SSD?:

@wrx7m said in IOPS for SSD?:

This is the storage config for the server-

I'm not sure about the state of NVMe support on VMware and Dell. But it might be an option.
I mean I'm sure it supported but the question is what options you have for redundancy.

NVMe drives have ridiculous IOPs and transfer rate and a single drive will normally outperform an SSD array.

I'm interest in this myself as I have a customer that are looking at ESXi on Dell R740 servers with the same type of CPU that you have but with less storage capacity overall.

The SSD array will be a significant upgrade and probably more speed than we would need. However, with the second tier, we need significantly more storage and the IOPS are less of a concern, as it is for file storage.

I can look at prices to see what the cost difference is. I don't think I even considered nvme for the servers.

You should be able to only have a single license server. Anyone else know of a reason you can't run the license server on one of the RDS servers? I wouldn't run it on the DC.

I overlooked the fact that one was only 6Gbps. I found another one that showed 12Gbps and it had KPM5XRUG960G at the end. I googled that and it seems that one is a Kioxia/Toshiba drive. The DWPD matches the Dell server config description of "1"

https://www.span.com/product/KIOXIA-PM5-R-Toshiba-SSD-Read-Intensive-SIE-KPM5XRUG960G-2-5-SAS-12Gb-960GB-SSD~69373

@Pete-S said in IOPS for SSD?:

@wrx7m said in IOPS for SSD?:

@Pete-S said in IOPS for SSD?:

@wrx7m said in IOPS for SSD?:

@Pete-S Thanks. This one is harder to find. Dell has several 960GB 2.5" SSD RI SAS drives on their site and the server configuration doesn't list the part numbers, but does list DWPD and TBW, but then their individual drive purchase options don't list those figures. At least, not that I have seen for this capacity.

Do you have a link?

Could be this one, but there are several that it could be on their search results.
https://www.dell.com/en-us/work/shop/accessories/apd/400-bdqr

The full name of that says: Dell 960GB SSD SATA Read Intensive 6Gbps 512e, 2.5in Drive in 3.5in Hybrid Carrier S4510.

S4510 in the product description being the magic number here. That's an Intel drive. Just look for Intel S4510 960GB drive and you'll find it.

PS. Here you go:
https://ark.intel.com/content/www/us/en/ark/products/134912/intel-ssd-d3-s4510-series-960gb-2-5in-sata-6gb-s-3d2-tlc.html

Oh, I see. OK. Thanks for pointing out the obvious
Too bad the server config doesn't tell you exactly which drives they are.