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Sep
19
comment Disk Capacity Planning for Whisper / Graphite
Okay, so with this retention settings. Roughly: ServerCount * MetricCount * 4.5MBytes
Sep
19
comment Disk Capacity Planning for Whisper / Graphite
Thanks for this. So with the filesize, is that what it will be after an hour of collecting data, or is that what the filesize will pretty much always be? So is 4415092 representative of 5 years worth of data this retention, or is that representative of one hour of 1 minute data? Also, is that bytes or bits?
Sep
19
comment Disk Capacity Planning for Whisper / Graphite
Any chance you have some sample numbers from that (paired with retention settings). Right now I'm thinking about different time series data stores in terms of disk usage - so getting graphite live for that is bit a of a todo.
Sep
17
comment Disk Capacity Planning for Whisper / Graphite
Ya, that math is straightforward, I'm really just looking more on how Graphite stores it data - can make major differences at scale. The only thing I have found is that according to the docs it is not very space efficient (Probably because it counts on fairly aggressive rollups).
Aug
1
comment How to edit TCP window size from iptables?
Have to admit, pretty curious as to why you would want to do this?
Mar
5
comment When using TCP load balancing with HAProxy, does all outbound traffic flow through the LB?
@TimvanElsloo: The network stack will the load balancers IPs, if you add option forwardfor HAProxy will add an HTTP header, X-Forwarded-For IIRC, with the original IP.
Feb
14
comment IOAT enabled but not being used with Linux?
@mdpc: CentOS 6.3, tried a much newer kernel to see if it would help, but it didn't. This was a secondary issue discovered when having high si% on ksoftirqd with ipsec traffic (not that I expect offloading on the ipsec traffic itself, but would seems there is no ioatdma at all.
Jan
23
comment SNMP Deprecated in Windows Server 2012
Currently trying to read up on CIM, wondering who else supports it, I do see the "SBLIM project"
Nov
30
comment Choosing the right AWG for Server Power Cables?
Doesn't voltage matter as well?
Nov
30
comment Choosing the right AWG for Server Power Cables?
@MDMarra: So as not to be confused with the floor units. From wikipedia, "The term (PDU) may refer to two major classes of hardware power devices; the first and typically the general unqualified term refers to the category of relatively higher-cost floor-mounted power distribution devices which transform one or more larger capacity raw power feeds into any number of lower capacity distributed power feeds .... The second type of PDU is sometimes called a Smart-PDU, Rack-based PDU, Intelligent PDU or simply "Power Strip" by various IT professionals"
Nov
29
comment How do SAN Certs degrade performance?
I'm testing some self-signed SANs now, can't get a measurable difference with HAProxy as the server and CURL/WGET as the clients with 2.5k names. Tried 20k names but got (35) error:1408E098:SSL routines:SSL3_GET_MESSAGE:excessive message size
Nov
29
comment How do SAN Certs degrade performance?
On a call with Comodo they told us this was the case (starts to degrade over a hundred or so). I was guessing it was maybe "processing each entry", but I'm not sure of the processing flow there -- hence my question.
Nov
28
comment What does Active, Targetset, and Active targetset mean in the Output of dfsutil /pkiinfo?
@tonyroth: "OR" The client is in a different network (subnet) within the site than OR-UTIL01, but the client's subnet is properly assigned to the same site in AD Sites and Services.
Nov
28
comment What does Active, Targetset, and Active targetset mean in the Output of dfsutil /pkiinfo?
I did read "NOTE: PKTINFO indicates a successful connection to the referral returned by listing it as ACTIVE" So maybe NY-FS01 is blocked by the firewall (pretty sure it is from this client). Just Active means the connection is working, ACTIVE TARGETSET means it is Active and that connection is being used? But what would just TARGETSET mean?
Nov
14
comment Instances in OpenStack are not getting DHCP leases
@LorinHochstein: Seems to exist already at bugs.launchpad.net/nova/+bug/1029430 , someone was asking about this in #openstack too, which was why I posted this. See (github.com/mseknibilel/OpenStack-Folsom-Install-guide/issues/14) for more info on my setup.
Nov
14
comment Instances in OpenStack are not getting DHCP leases
@LorinHochstein: I wasn't getting leases with the Cirros test image or the latest Ubuntu images, so I don't think this is limited to only a obscure guests. I do have libvirt_use_virtio_for_bridges=True so I don't think that would fix it.
Nov
2
comment Autoaccept all Certs on Puppet Master
This is on the master?
Oct
20
comment HAProxy crashes on all requests in 1.5-dev12
The haproxy author watch this tag, so will be probably see this. In the meantime, he has instructions for getting a core dump in this mailing list message: permalink.gmane.org/gmane.comp.web.haproxy/7992
Oct
19
comment Will 208v Hurt My Servers?
@sysadmin1138: Happen to have any references for 208 being a little bit more efficient wattage wise than 120?
Oct
12
comment Sender Information Not Cached on the Receiver During an ARP Request
You might also be interested in looking at the tool ettercap. Allows you to play with some ARP attacks (Use it for good of course, and only in lab/home environments).