storage - What is the maximum drive size compatible with the H700 Raid controller for Dell Servers?

I am thinking of stuffing twelve 6 TB drives on my R510 server. I know the latest firmware for the H700 controller support more than 2 TB. However, there is no clear documentation on what is the maximum disk size. The lack of documentation makes me assume that there is no limit, except for the highest space drive that can be made today.

Is this true?

Answer

Part of me says to check with Dell... Specifically to see what they're selling as an option part for these servers and whether they've validated the use of 6TB disks. I'm assuming you wouldn't be using Dell-sourced drives, though...

In terms of compatibility, 2TB was the big issue for many controllers. Since the H700 has confirmed large-drive support (>2TB), there's a strong likelihood that they will work. This depends on the specific disks you use, of course. Some of the drive manufacturers have controller compatibility lists as well. So if you have a drive in mind, check to see if it supports your H700.

Active Directory group membership timestamp

I am trying to find a timestamp for when a Machine Object was added to an active directory group.

I know the object doesn't change it's "last modified" date when added to a group because it is the group that is being modified. I have a query in SCCM that checks the group every 24 hours. My helpdesk is saying it is not working, and I want to ensure the additions are happening when they say they are.

domain name system - How to create a high-availability application server?

I am working with some hardware units which uses mobile Internet to communicate to my application server.

Initially, the hardware had a hard-coded IP address (load balancer) in the hardware for communication which was used to route the traffic to my application server; now this creates a single point of failure if the load balancer goes down the whole redundant infrastructure behind it becomes useless since its objective is to share the load, not to maintain the availability.

Now I asked the hardware creator to switch it to using DNS, and by using multiple A records I got better results. In this case I can have applications servers directly working with the hardware; but if one server goes down some hardware units fail to communicate for a while, but it goes to the other server in 20-30 minutes; since DNS failover doesn't work always.

So how can I overcome this problem and keep my application server working somehow all the time?

Answer

As your question is quite generic and doesn't give any details about the involved software, my answer is short as well: Just use a set of two loadbalancers, which share a 'virtual IP' between them via the use of e.g. vrrp (the "Virtual Router Redundancy Protocol") or pacemaker (there are more options available as well). Use two machines for that, which are either bare metal or running from two different hosts. If one of the machine goes down, the other will take over the IP. Point your record to this IP (and remember: DNS isn't made to achieve high availability.)

Edit 1: As @Ondra Sniper Flidr mentioned in the comments: Another solution is keepalived.

Edit 2: You could also have a look at CARP, the "Common Address Redundancy Protocol". A software solution using this protocol would be UCARP for example.

hp proliant - HP DL380p Gen8 and PCIe SSD?

I have a doubt about using 3rd party PCIe SSD or SSD generally with HP DL380p Gen8.
Do someone have tested it by any chance with 3rd party PCIe SSD and/or SSD's and/or normal HDD's ?

or by any chance if tested with OCZ 240GB PCI Express RevoDrive 3 X2 SSD ?

Answer

This is mostly covered here: Third-party SSD solutions in ProLiant Gen8 servers

PCIe should be fine, regardless of the model. You may have to adjust BIOS setting to accommodate (cooling, etc.). The system fans may spin at a higher rate.

SSDs in a disk form-factor may or may not work. You have the additional challenge of finding HP SmartDrive carrier trays for the disks. Prior to the Gen8 servers, you could get away with this, but now you will receive firmware mismatch errors on the drives, or a notice that the disk is not genuine.

Update: I've tested the OWC Mercury Accelsior PCIe SSD in G6, G7 and Gen8 HP ProLiant servers. See the result here.

domain name system - Can I use DMARC if SPF fails

I'm trying to enable DMARC.

The problem that I see is that since I use 3rd party companies for marketing emails, DMARC SPF fails for those emails because they put email from their own domain into return path (i.e. bounce email address).

This is what I see in the report:

   
  3rdpartyIP 
  1  
      

    none 
    pass   
    fail 
     
  
   
  mydomain.com   
  
  
      

    mydomain.com   
    pass   
     
   
    3rdparty.domain    
    pass   
      
 

I.e. auth_results are fine, but policy_evaluated fails.

So the question is:

Is there any way to check only for DKIM in the DMARC policy?

Thanks,
Best regards,

Roman

Answer

What that says is that the none means it's not rejecting the email based on your DMARC Policy. According to DMARC either your ASPF or ADKIM must pass, in your case the ADKIM passes. So it doesn't take a Reject action against the email, if it said reject then you have reason to be concerned. There are email testers that will evaluate your ASPF and ADKIM, but you don't have to, because this is a perfectly normal scenario and nothing for you to worry about.

hp - ML350 G6 drive not detected

I have an ML350 G6 that I have bought some new drives (HP P/N: 507129-004) for. According to the drive specs these are compatible with the G6 but the SAS controller (p410i) is not detecting them. The controller works fine as I have another set of disks that I have xcp-ng installed on working perfectly on the server.

Seeing as the raid controller is fine, server works perfectly with other disks and assuming the 507129-004 disks are not faulty (I have 15 and they all act the same) what else could prohibit the p410i sas raid controller from detecting the drives?

Any guidance appreciated.

linux - How to delete folder of owner/group 99 99

I am using wordpress with wp-super-cache plugin. This plugin automatically created a cache folder in my site for storing the cached files.

But unusually it created folder with owner/group 99 99. It was created automatically.

Due to this, i am not able to delete that folder or change the CHMOD of that folder. This really a headache. I searched google, but none gave me a good answer.

Please help me delete or change the CHMOD of that folder ?

I am on Linux server.