Unanswered Questions
77,096 questions with no upvoted or accepted answers
36
votes
1
answer
4k
views
Unexpected and unexplained slow (and unusual) memory performance with Xeon Skylake SMP
We've been testing a server using 2x Xeon Gold 6154 CPUs with a Supermicro X11DPH-I motherboard, and 96GB RAM, and found some very strange performance issues surrounding memory when compared to ...
CommunityBot
- 1
16
votes
0
answers
10k
views
Restoring data after zfs destroy
On Debian 8.7 I had a zfs pool.
(obviously using ZFS on Linux, not Oracle or Solaris zfs)
It was needed to extend ZFS pool from mirror on 2 disks to raidz on 4 disks.
I did backup (one copy of data - ...
- 182
16
votes
1
answer
2k
views
Using defaultAuthenticationType with PowerShell Web Access
PowerShell web access lets you choose the authentication type. By default, it uses a value of Default, which ends up being Negotiate. I have set up CredSSP to allow logging into the PSWA server itself ...
CommunityBot
- 1
14
votes
1
answer
6k
views
Is MSIZAP still useful, or is it obsolete?
I update flash using MSI files installed by group policy. However, with every update, about a third of the workstations fail to update (Windows Vista and Windows 7 32/64-bit editions). In the event ...
CommunityBot
- 1
14
votes
1
answer
17k
views
Parallel Redo Is Shutdown
When looking in Windows event logs, i'm seeing the following messages on an almost continuous basis -
Starting up database 'Database'.
Parallel redo is started for database 'Database' with worker ...
- 31
13
votes
4
answers
2k
views
Freebsd change default Internet channel route
I have two Internet channel and Gateway on freebsd. When I switch channel with the command route change default chan2, the command netstat -nr shows changed default route. But traceroute shows that ...
13
votes
1
answer
6k
views
Change Envelope From to match From header in Postfix
I am using Postfix as a gateway for my domain and need it to change or rewrite the Envelope From address to match the From header. For example, the From: header is "joe@domainA.org" and the Envelope ...
CommunityBot
- 1
11
votes
0
answers
6k
views
How can a Cognito user initialize TOTP on first login when MFA is required?
I am setting up Amazon Cognito for authentication to use a Kibana instance. I only permit administrators to create users, and I permit only the Cognito User Pool identity provider. When creating the ...
- 1
11
votes
0
answers
489
views
How much does FreeBSD accept_filter actually improve performance in a modern world?
I recently learned about FreeBSD's accept_filter socket option which can allow a worker process to avoid context switching by, for example, waiting until a full HTTP request is received with accf_http:...
- 9,070
11
votes
1
answer
1k
views
Disable file locks on a read-only Windows File Share
Case
On a Windows Server (2012R2 or 2016), I want to configure a file share offering a following functionality
some users, publishers group, have a write access to the share; these users are ...
- 93
11
votes
0
answers
4k
views
haproxy CD flags with browser, not with curl
Issuing the same url request, from the same workstation to the same haproxy server:
with a browser (tried Chrome and Firefox): haproxy log shows CD flags
with curl: haproxy log shows --
Both ...
11
votes
2
answers
1k
views
Unable to bind OSX 10.9 to Active Directory 2008
I am struggling to bind OSX 10.9 to a 2008 r2 Active Directory. I can join the domain fine when I boot into Windows from the same machine. From OSX I can find the domain controller successfully and ...
CommunityBot
- 1
11
votes
1
answer
5k
views
certutil -ping fails with 30 seconds timeout - what to do?
The certificate store on my Win7 box is constantly hanging. Observe:
C:\>1.cmd
C:\>certutil -? | findstr /i ping
-ping -- Ping Active Directory Certificate Services Request interface
...
CommunityBot
- 1
11
votes
2
answers
761
views
Firefox dynamic default preference configuration
My users are all on NFS home directories and with hundreds of users all using Firefox it generates a bit of traffic reading/writing to the disk cache. As a result, I'd like to move the default ...
- 47
10
votes
0
answers
3k
views
Docker container crashing ubuntu host
Very unexpected, but briefly if i run a docker container host becomes unresponsive, no in/out, can't ping it, only hard reboot works.
DMESG, sys and kernel logs doesn't show anything obvious
...
- 261