Monat: September 2021

Veröffentlicht am

Windows CCM Cache eats diskspace

Don’t delete the content of „c:\windows\ccmcache\“ manually with the File-Explorer:

  • it is managed by „Windows System Center Configuration Manager (SCCM)“.

You need „local Administrator“ access to your computer.

Let SCCM to cleanup it’s cache for you:

1) open the „Control Panel“

Control Panel – Configuration Manager

2) select „Configuration Manager“

3) go to „Cache“-Tab

4) click „Delete Files“

Configuration Manager – Delete Cache

Wait a second and the CCM-Cache is empty.

c:\Windows\ccmcache>dir
 Volume in drive C is Windows
 Volume Serial Number is 5Q4C-0K08

 Directory of c:\Windows\ccmcache

23.09.2021  19:10    <DIR>          .
23.09.2021  19:10    <DIR>          ..
               0 File(s)              0 bytes
               2 Dir(s)  11.164.721.152 bytes free
Veröffentlicht am

ESXi 6.7u2 and later – SCAv2 (Side Channel aware Scheduler v2)

While the „old“ SCAv1 built a virtual fence around all virtual processors („Intra VM Security Boundary“), SCAv2 lets processors of one virtual machine (VM) to run within a „common fence“ („Inter VM Security Boundary“) which balances security and performance for most workloads.

See https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/performance/scheduler-options-vsphere67u2-perf.pdf for performance analysis.

Configure

esxcli system settings kernel set -s hyperthreadingMitigation -v TRUE
esxcli system settings kernel set -s hyperthreadingMitigationIntraVM -v FALSE

Verify

esxcli system settings kernel list -o hyperthreadingMitigation
esxcli system settings kernel list -o hyperthreadingMitigationIntraVM

[root@esx:~] esxcli system settings kernel list -o hyperthreadingMitigation
Name                      Type  Configured  Runtime  Default  Description
------------------------  ----  ----------  -------  -------  ----------------------------------------------------------------
hyperthreadingMitigation  Bool  TRUE        TRUE     FALSE    Restrict the simultaneous use of logical processors from the
                                                              same hyperthreaded core as necessary to mitigate a security
                                                              vulnerability.
[root@esx:~] esxcli system settings kernel list -o hyperthreadingMitigationIntraVM
Name                             Type  Configured  Runtime  Default  Description
-------------------------------  ----  ----------  -------  -------  ---------------------------------------------------------
hyperthreadingMitigationIntraVM  Bool  FALSE       FALSE    TRUE     Restrict the simultaneous use of logical processors from
                                                                     the same hyperthreaded core as necessary to mitigate a
                                                                     security vulnerability within a single VM.

Configure SCAv1

esxcli system settings kernel set -s hyperthreadingMitigation -v TRUE
esxcli system settings kernel set -s hyperthreadingMitigationIntraVM -v TRUE
Veröffentlicht am

Atom Texteditor: Highlight Comments

Comments are greyed out by default, nobody should read them 😉 I don’t want to think about the comment-quality of the Atom-Sourcecode, just kidding 😉

 

To change the comment-colour to a fresh and visible green:

  • open the file (as administrator) c:\>notepad c:\Users\<username>\.atom\styles.less

atom-text-editor::shadow { .punctuation.comment, .comment, .link.hyperlink { color: #88ff88; } }