APC AP7862 Firmware Update Notes

With some firmware versions uploading new firmware via serial doesn’t work. The transfer will complete and the unit will reboot but it will still be running the old firmware. FTP transfer work well. Some older firmware can’t accept an FTP file transfer of the newest firmware. There is an older version packaged with the new […]

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[Areca RAID] RAID configuration disappears

If you’ve had a previously configured Raid Set on an Areca RAID controller and it all of a sudden disappears it can sometimes be salvaged. In the RAID BIOS: Raid Set Function -> Rescue Raid You’re then prompted to “Enter the Operation Key.” This is ambiguous in the documentation and there’s also a mispelling for […]

[MySQL/MariaDB/CentOS 7] mysqldump: Couldn’t execute XXXXX (Errcode: 24 “Too many open files”) (23)

MySQL/MariaDB will sometimes hit its open file limit when doing large mysqldump operations. On a lot of distributions you can raise the limit by adding the following line to the /etc/my.cnf file and restarting the service: open_files_limit=XXXX This doesn’t work on systemd controlled database services so you need to add the following lines to /etc/systemd/system/mariadb.service.d/limits.conf […]

[Linux/quotacheck] quotacheck: Cannot stat directory //var/spool/exim_incoming/scan/1erAzg-0007eX-E1: No such file or directory

When running quotacheck on a filesystem that isn’t read only it will error out and not finish if it’s unable to stat a certain file or directory. It does this because it assumes that there’s a problem with the filesystem. If your mail software is actively processing mail when running quotacheck it will get an […]

[OpenVZ/KVM/CentOS 7] No login prompt on boot

When converting CentOS 7 OpenVZ systems to KVM sometimes there is no login prompt after loading services. The machine is otherwise operating correctly. Here’s the fix to get the login prompt back: mv /etc/systemd/system/getty.target.wants/getty\@tty2.service /etc/systemd/system/getty.target.wants/getty\@tty1.service Afterwards the keyboard input may not work. Rebuilding the initial ramdisk will fix that: dracut -f

[RHEL 7/CentOS 7] Hanging Boot After Conversion to RAID1 (degraded RAID)

Quick fix… Rebuild the ramdisk. If you are using a rescue disk and are compiling for a different kernel version replace $(uname -r) with your kernel version: dracut –mdadmconf –fstab –add=”mdraid” –filesystems “xfs ext4 ext3 tempts devotes syses proc” –add-drivers=”raid1″ –force /boot/initramfs-$(uname -r) $(uname -r) Add the following to /etc/default/grub inside the quotes for the […]