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17%
CephX Encryption
27.03.2013
Home »  HPC  »  Articles  » 
We look at the new features in Ceph version 0.56, alias “Bobtail,” talk about who would benefit from CephX Ceph encryption, and show you how a Ceph Cluster can be used as a replacement for classic ... by normal users. But there’s a flaw – although the mechanism is still reasonably easy to enable (in the new v0.56, three lines in /etc/ceph/ceph.conf are all it takes), activating CephX will make many ... We look at the new features in Ceph version 0.56, alias “Bobtail,” talk about who would benefit from CephX Ceph encryption, and show you how a Ceph Cluster can be used as a replacement for classic
17%
Appendix – I/O Report from MPI Strace Analyzer
15.02.2012
Home »  HPC  »  Newsletter  »  2012-02-15 HPC...  » 
 
of Total Elapsed Time = 0.003117 seconds Average IO Time = 12.768351 seconds (0.378% of Total Time) Standard Deviation of IO Time = 9.919384 seconds Figure 1 below plots the total elpased time (yellow
17%
Appendix – I/O Report from MPI Strace Analyzer
26.01.2012
Home »  HPC  »  Newsletter  »  2012-02-01 HPC...  » 
 
of Total Elapsed Time = 0.003117 seconds Average IO Time = 12.768351 seconds (0.378% of Total Time) Standard Deviation of IO Time = 9.919384 seconds Figure 1 below plots the total elpased time (yellow
17%
Distributed storage with Sheepdog
07.10.2014
Home »  Archive  »  2014  »  Issue 23: 10 Ti...  » 
Lead Image © kateleigh, 123RF.com
Sheepdog Server in Action # ps -ef|egrep '([c]orosyn|[s]heep)' root 491 1 0 13:04 ? 00:00:30 corosync root 581 1 0 1:13 PM ? 00:00:03 sheep -p 7000 /var
17%
Fundamentals of I/O benchmarking
11.04.2016
Home »  Archive  »  2016  »  Issue 32: Measu...  » 
Lead Image © Kheng Ho Toh, 123RF.com
wMB/s avgrq-sz ... sdb 0.00 28.00 1.00 259.00 0.00 119.29 939.69 ... Parallelism Multiple computers can access enterprise storage, and multiple threads can access
17%
Netcat – The Admin’s Best Friend
20.08.2012
Home »  Articles  » 
 
With the seemingly unlimited number of Linux packages available today in repositories, sometimes it’s easy to get lost and miss out on the really high quality packages – those that offer the most ... examplehost.tld 22 If firewalling is in place and you need to originate your connection from a specific IP address to open a port, entering # nc -s 1.2.3.4 examplehost.tld 8181 will connect to examplhost ... With the seemingly unlimited number of Linux packages available today in repositories, sometimes it’s easy to get lost and miss out on the really high quality packages – those that offer the most ... Netcat – The Admin’s Best Friend
16%
Linux device mapper writecache
30.01.2020
Home »  Archive  »  2020  »  Issue 55: AWS L...  » 
Lead Image © lightwise, 123R.com
: 1 (f=1): [w(1)][100.0%][r=0KiB/s,w=1401KiB/s][r=0,w=350 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=3104: Sat Oct 12 14:39:08 2019 write: IOPS=352, BW=1410KiB/s (1444kB/s)(82.8Mi
16%
Speed up your MySQL database
11.02.2016
Home »  Archive  »  2016  »  Issue 31: Tunin...  » 
Lead Image © Mikhail Dudarev, 123RF.com
wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 2.00 8.00 2.00 9500.00 16.00 151948.00 31.99 1.07 0.11 4.00 0.11 0.09 88.40 If your read or write
16%
Processor and Memory Metrics
12.02.2014
Home »  HPC  »  Articles  » 
for the sake of brevity). Listing 5: User Information from ps_mem [root@home4 1]# ./ps_mem.py -p $(pgrep -u laytonjb | paste -d, -s)  Private  +   Shared  =  RAM used       Program    84.0 KiB +  12.5 Ki
16%
Profiling Python code
30.01.2020
Home »  Archive  »  2020  »  Issue 55: AWS L...  » 
Lead Image ©-Yong Hian Lim, Fotolia.com
and a truncated distance 243| 12475000| 50.5158| 4.04936e-06| 3.04%| d = 0.0 244| 49900000| 209.465| 4.1977e-06| 12.60%| for k in range(0, d_num): 245

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