IT Administration

VMware vSphere Web Client failed to load with error #2032

So, I wanted to check something in my vSphere Web Client (vCenter 5.5U3), but I was unable to log in and there was this error at the bottom of the screen:

RSL https://thisSERVERofMINE:9443/vsphere-client/locales/rsl/flex-common-lib-5.5.0.swf failed to load. Error #2032

There is a really simple solution and I would love if the error message was useful for once and told me so. You just need to clear your browser cache.

Internet Explorer – that would be CTRL-SHIFT-DEL and selecting temporary files
Google Chrome – also CTRL-SHIFT-DEL and selecting cache

IT Administration

The case against RAID 5, why use RAID 6 instead

For many years RAID 5 used to be best practices and golden standard for any organization, who cares about smoothness of their operations, especially when downtime means losing money. RAID 5 is cheap and when the hard drive in your array fails, you can replace it without data loss. You just swap the drive manually or you can have installed spare drive already in your storage device exactly for this situation. Users often won’t even notice something is wrong. RAID 6, on the other hand, is still seen as overkill with bigger overhead and with worse performance.

Disk cost

RAID 5 needs one more drive, which you cannot use for storing data. If any of the drivers fails, you can rebuild it without data loss.

RAID 6 needs two more drivers, bud you can lose 2 drives at once and you will still be able to rebuild the array successfully.

Speeds

The reading performance of RAID 5 and RAID 6 is basically the same.

The writing performance is a little bit more complicated, RAID 6 can be more power hungry (33 % more CPU power) and also little slower in some scenarios. But the difference can be eliminated using cache in your storage device.

So what’s the problem?

It’s the security. You are using RAID, so you obviously want no downtime –  restoring from backups takes precious time and you have to bring your information systems offline in most cases.

Many people think the chance of 2 disks failing at once is slim. It happens all the time, believe me. The drives have much bigger capacity today so the rebuild often takes days. When another drive fails in this period and you are using RAID 5, your data are gone.  Also, the rebuilding process is pretty disk-intensive and it can cause another failure. You have probably bought the disks at once, they can come from the same manufacturing batch and have the same defects. Hell, you probably installed them and started to use them on the same day!

There is another big problem, which wasn’t such a big deal years before. Storage is cheaper nowadays. With vast arrays of many terabytes, rebuilding times are not only much longer, but there is a higher chance to encounter URE (Unrecoverable Read Error) and again, lose your data.

One recommendation holds well against the time. RAID doesn’t replace backups. Have good backups, folks.

What do you think?

IT Administration

Those hellish Sharepoint 2013 backups

I spent a lot of time today on this one.

I tried to backup my Sharepoint 2013 farm, full backup, via Management Shell:

Backup-SPFarm -Directory \\SERVERXXX\farm_backup\ -BackupMethod full

It did save data but always ended with an error. At the end of the log file was this gem:

FatalError: Backup failed for Object Crawl-0 (E: on SERVERXXX) failed in event OnBackup. For more information, see the spbackup.log or sprestore.log file located in the backup directory.

It was a god-damned permission problem. If you are getting this error, check your database users – open up Sql Server 2014 Configuration Manager (or the version you have) and check those:

sql-server-config-manager-users

See? Those are default:

  • NT AUTHORITY\NetworkService
  • NT Service\MSSQL$SQLEXPRESS

Grant them NTFS permission to the backup location and to the share (full access). Run the backup to see if the problem persists. This did it for me.

IT Administration

Default passwords for printers

First thing you should do when you connect new printer to your network is to set a password or change the default one. This article will help you with the later if you don’t know what the default password is.

HP

Most HP printers default passwords would be blank or admin for both username and password.

HP LaserJet 2250dn

  • User: admin
  • Password: *leave empty*

HP LaserJet Professional P1606

  • User: Admin
  • Password: Admin

OKI

OKI B731

  • User: admin
  • Password: aaaaaa

OKI C332, C532, C542, C612, C712, C823, C833, C843, MC363,MC573, MC853, MC873

  • Default admin password: 999999

Brother

Brother HL-2130 to HL-2270DW

  • User: admin
  • Password: access

Works for these models: HL-2130, HL-2132, HL-2135W, HL-2220, HL-2230, HL-2240, HL-2240D, HL-2242D, HL-2250DN, HL-2250DW

Canon

Most models use:

  • User: ADMIN
  • Password: canon

If this doesn’t work, the password may be the serial number of the printer. You will find it on the white sticker. The serial number is 9 characters long (5 letters and 4 numbers).

Kyocera

Most models use:

  • User: Admin
  • Password: Admin

OR:

  • Password: admin00

Konica Minolta

Bizhub C258, 558e and many more

  • Administrator’s password: 1234567812345678

Lexmark

Lexmark 4600 MFP

  • Password: password
IT Administration

SOLVED: Exchange 2010 – ECM says initialization failed

You open your Exchange Management Console and there is an error: Initialization failed.

Initialization failed

The following error occured while attempting to connect to the specified Exchange server “your.server.com“:

The attempt to connect to http://your.server.com/PowerShell using “Kerberos” authentication failed:Connecting to remote server failed with the following error message : The WS-Management service cannot process the request. The system load quota of 1000 requests per 2 seconds has been exceeded. Send future requests at a slower rate or raise the system quota. The next request from this user will not be approved for at least 2137633920 miliseconds. For more information, see the about_Remote_Troubleshooting Help topic.

EMC Initialization Failed

We will not try to find the cause of the problem in this article, let’s leave the troubleshooting for long winter evenings. We will just fix it fast so you can do your work.

IISRESET

Open an elevated command line and execute command “iisreset” on the Exchange server. It took only about half a minute to reset Internet Information Services with this command line utility. EMC should work fine now.