Upgrade DS1812+ RAM to 6GB

After I found there is an internal memory also can be replaced, I decided to try replace it with higher capacity memory.

Before

I got one 4GB memory and one 1GB default memory.

Swap

Because the default is not easy to reach and I'm not sure whether the slot is suitable for 4GB RAMs or not, so I swap two RAMs and boot.

Result: It works. Not the default memory slot has 4GB RAM in it.

Upgrade to 6GB

Then I replace the 1GB memory to 2GB as below.

root@ds1812:~# free
              total        used        free      shared  buff/cache   available
Mem:        6106616      576752      593516       16440     4936348     5115404
Swap:       2097084      166520     1930564
root@ds1812:~# cat /proc/meminfo
MemTotal:        6106616 kB
MemFree:          434420 kB
Buffers:            5968 kB
Cached:          4793912 kB
SwapCached:        18104 kB
Active:          1456104 kB
Inactive:        3398440 kB
Active(anon):      30672 kB
Inactive(anon):    40608 kB
Active(file):    1425432 kB
Inactive(file):  3357832 kB
Unevictable:        5560 kB
Mlocked:            5560 kB
SwapTotal:       2097084 kB
SwapFree:        1930572 kB
Dirty:             48688 kB
Writeback:             0 kB
AnonPages:         48644 kB
Mapped:            42632 kB
Shmem:             16448 kB
Slab:             289948 kB
SReclaimable:     113820 kB
SUnreclaim:       176128 kB
KernelStack:        9360 kB
PageTables:        44156 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     5150392 kB
Committed_AS:    1645472 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      465564 kB
VmallocChunk:   34359255664 kB
DirectMap4k:       16876 kB
DirectMap2M:     6262784 kB
root@ds1812:~#

References

Upgrade Synology DS1812+ Memory

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:~#