Hello Martin, how much disk space do you reserve for log in the PXE setup? Regards Thomas Am 22.03.2020 um 20:50 schrieb Martin Verges: > Hello Samuel, > > we from croit.io don't use NFS to boot up Servers. We copy the OS directly > into the RAM (approximately 0.5-1GB). Think of it like a container, you > start it and throw it away when you no longer need it. > This way we can save the slots of OS harddisks to add more storage per node > and reduce overall costs as 1GB ram is cheaper then an OS disk and consumes > less power. > > If our management node is down, nothing will happen to the cluster. No > impact, no downtime. However, you do need the mgmt node to boot up the > cluster. So after a very rare total power outage, your first system would > be the mgmt node and then the cluster itself. But again, if you configure > your systems correct, no manual work is required to recover from that. For > everything else, it is possible (but definitely not needed) to deploy our > mgmt node in active/passive HA. > > We have multiple hundred installations worldwide in production > environments. Our strong PXE knowledge comes from more than 20 years of > datacenter hosting experience and it never ever failed us in the last >10 > years. > > The main benefits out of that: > - Immutable OS freshly booted: Every host has exactly the same version, > same library, kernel, Ceph versions,... > - OS is heavily tested by us: Every croit deployment has exactly the same > image. We can find errors much faster and hit much fewer errors. > - Easy Update: Updating OS, Ceph or anything else is just a node reboot. > No cluster downtime, No service Impact, full automatic handling by our mgmt > Software. > - No need to install OS: No maintenance costs, no labor required, no other > OS management required. > - Centralized Logs/Stats: As it is booted in memory, all logs and > statistics are collected on a central place for easy access. > - Easy to scale: It doesn't matter if you boot 3 oder 300 nodes, all > boot the exact same image in a few seconds. > .. lots more > > Please do not hesitate to contact us directly. We always try to offer an > excellent service and are strongly customer oriented. > > -- > Martin Verges > Managing director > > Mobile: +49 174 9335695 > E-Mail: martin.verges@xxxxxxxx > Chat: https://t.me/MartinVerges > > croit GmbH, Freseniusstr. 31h, 81247 Munich > CEO: Martin Verges - VAT-ID: DE310638492 > Com. register: Amtsgericht Munich HRB 231263 > > Web: https://croit.io > YouTube: https://goo.gl/PGE1Bx > > > Am Sa., 21. März 2020 um 13:53 Uhr schrieb huxiaoyu@xxxxxxxxxxxx < > huxiaoyu@xxxxxxxxxxxx>: > >> Hello， Martin， >> >> I notice that Croit advocate the use of ceph cluster without OS disks, but >> with PXE boot. >> >> Do you use a NFS server to serve the root file system for each node? such >> as hosting configuration files, user and password, log files, etc. My >> question is, will the NFS server be a single point of failure? If the NFS >> server goes down, the network experience any outage, ceph nodes may not be >> able to write to the local file systems, possibly leading to service outage. >> >> How do you deal with the above potential issues in production? I am a bit >> worried... >> >> best regards, >> >> samuel >> >> >> >> >> ------------------------------ >> huxiaoyu@xxxxxxxxxxxx >> >> >> > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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