Recently, upgrade iMac memory from 4GB each to 8GB. Officially this 2011 iMac only supports 4GB each, but 8GB memory can be installed.
It can also install mixed memory size and mixed speed. I also installed the memory which supported both 1.3v and 1.5v.
As the Synology DS1812+ NAS officially only supports 3GB RAM, I used 3GB RAM NAS for many years.
Recently, I got one 1Rx8 4GB DDR3 RAM, wanted to try to see whether DS1812+ can use it.
After installed, luckily it is working. Plus 1GB on board memory, it has about 5GB memory now.
root@ds1812:~# free
total used free shared buff/cache available
Mem: 5072432 901144 323456 15908 3847832 3761546
Swap: 5140404 460920 4679484
root@ds1812:~# cat /proc/meminfo
MemTotal: 5072432 kB
MemFree: 890332 kB
Buffers: 6104 kB
Cached: 3018256 kB
SwapCached: 29084 kB
Active: 662768 kB
Inactive: 2548468 kB
Active(anon): 94080 kB
Inactive(anon): 108664 kB
Active(file): 568688 kB
Inactive(file): 2439804 kB
Unevictable: 5804 kB
Mlocked: 5804 kB
SwapTotal: 5140404 kB
SwapFree: 4675032 kB
Dirty: 18444 kB
Writeback: 3860 kB
AnonPages: 188544 kB
Mapped: 76504 kB
Shmem: 15376 kB
Slab: 261456 kB
SReclaimable: 63788 kB
SUnreclaim: 197668 kB
KernelStack: 14400 kB
PageTables: 69604 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 7676620 kB
Committed_AS: 4152632 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 478460 kB
VmallocChunk: 34359221580 kB
DirectMap4k: 16876 kB
DirectMap2M: 5214208 kB
root@ds1812:~# Recently upgraded my DS1812+ memory, the backup job was stuck, but I don't know whether they are related. Because I was rebooting in the morning, but the backup was stuck at 4pm.
To fix the issue, run following command
sudo killall backupdSome people mentioned commands
sudo service com.apple.metadata.mds stop
sudo service com.apple.metadata.mds startBut there is no service command in my MacOS.
To save time on reviewing comment in WordPress, I decided to implement ReCatpcha in WordPress.
Download Advanced noCaptcha & invisible Captcha plugin, because it supports many forms, including Contact Form 7 which I'm using currently.
Get Google reCAPTCHA keys and configure them into two fields in settings of plugin.
recaptcha.net as Recaptcha DomainNote: I chose V3.
Result will be a smal box at right bottom corner on each page.
In Contact Form 7 plugin configuration, click on the form which used and add following statement.
[anr_nocaptcha g-recaptcha-response]There is an issue after turned on.
The contact form has one empty non-editable box, very annoying.
How to get Google reCAPTCHA keys?
Adding any type of CAPTCHA check to Contact Form 7 forms
Contact Form 7 ReCaptcha SPAM Issues
rmlintusageThe command rmlint can be used to dedup the files, which can support reflink.
I was using reflink dedup for BTRFS, but end up, I changed to hardlink. I think hardlink is more commonly used in Unix environment
rmlint -T df --config=sh:handler=hardlink /dedupThis will dedup the files in /dedup directory, and will generate a file called rmlint.sh in current directory. Run that shell script, will change duplicated files to hard link.
The -T df means dedup files.
The config=sh means generate shell script
The handler=hardlink means generate script using hardlink dedup
There are many options, but I don't use them.
I was changing harddisk in Synology DSM 7 in the volume with Docker package installed by recreating the volume, it requires docker package to be removed. I thought the docker folder (/volumeX/docker) might not removed, so backed up the container images into docker folder. But I was wrong, the docker folder was removed.
The docker folder was created by Docker package, which can be moved to other volume after stopped Docker package. I didn't see any data in it, and I don't know what the usage of this folder is and it is zero in size.