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About iJarda

  • Title

Contact Methods

  • Twitter

Profile Information

  • Gender
  • Location
    Pilsen, CZ
  • Interests
    enterprise tech (server HW, SW, VMware etc.), all around computers, a bit of Apple devices (like MDM or another enterprise stuff like that)...
  • Occupation
    Student of Faculty of Information Technology at Czech Technical University


  • CPU
    Intel Core i7-6800K
  • Motherboard
    Asus X99-E WS
  • RAM
    Corsair Vengeance LPX 32 GB (4x 8GB) DDR4 2666 MHz
  • GPU
    Gigabyte GTX 960 G1 Gaming 4GB
  • Case
    Fractal Design Define R5
  • Storage
    Samsung 960 Pro 512 GB + few TB on iSCSI
  • PSU
    Corsair HX850i
  • Display(s)
    2x Dell U2515H + Apple Thunderbolt Display
  • Cooling
    Be Quiet Dark Rock Pro 3
  • Keyboard
    Apple Wireless Keyboard (2009 version)
  • Operating System
    OS X 10.13, CentOS 7, ESXi 6

Recent Profile Visitors

574 profile views
  1. iJarda

    "URGENT request" Router Defense.

    I would guess for SOHO it is Turris Omnia or MOX from CZ.NIC. It has automatic firewall rules distribution, automatic updates etc. Yes, it lacks features like PBR, but it is SOHO, not enterprise... check it out on https://www.turris.cz/en/ respectively https://omnia.turris.cz/en/ and https://mox.turris.cz/en/
  2. iJarda

    Network drives between two data centers

    I think, that if it has enough power, he can use OpenVPN directly on theese servers - I would recommend Linux as a server and Windows server as a client (but, then it has to be configured as a service on WS2016).
  3. These backplanes, especially SAS drives do that, as they don't power up till controller don't call them to spin up, on some systems it spin up drives one by one to not create current peaks.
  4. I have Dell R7910 (equivalent to R730) so I can measure that one for it's 2,5" inch backplane if that would help, but I think whole backplane should just need power sense pin is used also on 8-Pin for PCIe cards where it has 3.3V on that pin connected to pin where other PSUs or 8-pin graphics cards has ground which is internally connected ... so it just "shorts" 3.3V sense to ground and system then knows that this piece of HW is present or not (for example my R7910 knew about my backplane which throwed error when I haven't connected SAS cables and even if I have unplugged backplane control cable, it still throws error that theese cables are missing - it was based on that power cable with sense pin => so sense pin matter for system board, not whole backplane)
  5. yes, they make excellent SOHO, WISP and even their CAPsMAN are great, but not for big deployments which requires reliability. I don't know how better are Edge Routers (they are just even more cleaner Linux based on Debian just with more "friendly" GUI) but as I have long experience with their UniFi products, it is one big piece of sh.. They make excellent WISP products for long time, then they decided to join "enterprise" market by creating UniFi ... we have growing since 2013 with 40 APs to now almost 90 APs and I really wish to get rid with it ... it is just like standalone OpenWRT SOHO APs with orchestration like Ansible/Puppet written in Java and central collectiong of statistics with multiple minutes delay so ... also not recommended for big deployments. (also can explain -> PM). One thing that justifies that crap is that Robert Pera (Ubiquiti founder and CEO) says UniFi is "enterprise like" system. I wish if their marketing department think so.
  6. yea MS DHCP and ISC DHCPD are currently only DHCP servers, which have properly implemented failover as it is described in RFC. Our network was and partialy still is based on linux firewalls which are there since ages... and till few years ago they do ISC-DHCP and bind DNS authoritative/recursive combo also. Then we moved internal routing part, DHCP and DNS forwarding/recursive part to Mikrotik routers - we heavily use their API for DHCP registrations in our custom web app (!! DISCLAIMER you don't want it, Mikrotik is not reliable as DHCP, DNS, NTP etc... PM if anyone wants explanation !!) we will be moving to Cisco L3 switches with stack redundancy and we are preparing and evaluating to use ISC kea-dhcp - I really like it as it has native databse backends support, that means it can be scaled in >2 DHCP servers and use anycast with DHCP relays and clustered database backend (as Facebook uses it in their datacenters).
  7. me (at home) and us (at work) too - (mostly Linux and AD just because end users wants windows...) AFAIK MS DHCP and DNS cannot be easily used with any kind of API something like that
  8. AFAIK, you always need some form of DNS server, as @leadeater said that SRV records aren't that much special, but they describes AD servers which serves your local "search domain" with additional services like basic LDAP, kerberos etc. DNS on Windows server has one advantage - as you add more machines to domain, they are automatically added to DNS with records coresponding to their names, but same thing can be done with DHCP DDNS update function without anything related to AD. If you can't or don't want to let your AD DNS server to send DNS records updates "notifications" to your other (not AD) DNS server, you can grab all of required DNS records from %systemroot%\System32\config\netlogon.dns file and it will work without AD DNS being main DNS for your network (it can be even disabled or blocked by firewall or so...)
  9. iJarda

    SSD for VM server

    Recently I got my SM863, so as you say, it should be OK in ESXi? (R730 directly to SATA, without RAID card) (I haven't tried yet)
  10. iJarda

    backplane with controller

    If you can go with server hardware, there are few motherboards with integrated "RAID/HBA" controllers like ASRock Rack E3C224D4I-14S or some another from SuperMicro - I have that one from ASRock and if you don't plan to have multiple RAID/HBA controllers or multiple 10G cards, it is great choise.
  11. iJarda

    Where to buy Open Compute hardware

    For weight and size that they gave me (38 pounds and 35x24x9 inches), shipping quote is about 270$ which I think is still a lot.
  12. iJarda

    Where to buy Open Compute hardware

    Yes I have found that post and yes in most of Europe we have 230V outlets so that is no problem, ... and cardboard also isn't problem
  13. iJarda

    Where to buy Open Compute hardware

    I have 2 pieces of 2011 engineering samples in my hand which I got for free, so $240 for quad sockets (two servers) with power supply (which has great function that you don't need UPS if you have 48V array - next saving on your electricity bill and redundancy) is pretty good deal. It is for my home use (yes I'm using enterprise stuff at home...) and I don't have final idea of this infrastructure... so money isn't that big problem if it is for good reason. For now stay with $600-700 USD as total investment.
  14. iJarda

    Where to buy Open Compute hardware

    thanks, I will look at it
  15. iJarda

    Where to buy Open Compute hardware

    I don't require blade exactly, but I really like Facebooks (Open Compute) concept of light-weight servers with minimal hardware (=> less things that will draw power) ther approach is that these servers are designed without unnecessary hardware - in their scale of thousands of servers every watt is really big savings - I don't need giant RAID array in every server - I'm using single drive per server with nightly backup .. and planing using also SAN for that ...