SWAP size

[foxdoismil]

I am going to install 10.3.0.3 on an crucial SSD 120G. The server has 16G non-ecc RAM. Disks are on a ZFS array.
Should I create a swap partition? What size?
Should I reserve all the SSD for the nas4free install or reserve some are as DATA?
Should I use it as cache for ZFS?

[raulfg3]

Should I create a swap partition? What size?

is possible, but for your actual RAM , I do not recommended ( you did not use it).

Should I reserve all the SSD for the nas4free install or reserve some are as DATA?

If you do a embeded install, only 4GB are used to boot N4f, all the space (120-4) can be used as data disk ( you need to mount it prior to use, ( I use it to store temp data like DDBB of minidlna, and temp files from transmission and mlnet).

Should I use it as cache for ZFS?

NO, if you really need a cache, better use a dedicated HD, not a partitioned disk.

[foxdoismil]

If I install full and make a DATA partition and later I notice that I need the swap, would it be possible to define a swap file on the DATA partition? Tks for the help.

[JoseMR]

If I install full and make a DATA partition and later I notice that I need the swap, would it be possible to define a swap file on the DATA partition? Tks for the help.

Hello, you should use at least 2GB(what I personally use) of Swap space regardless of the amount of RAM you already have, this will make you peace of mind also, running out of Swap will cause the OOM(out of memory) killer to terminate some process on the system to release RAM, leading to a unresponsive/unreachable system, or even worst a crash/panic.

Having a small native Swap space on disk is a rule of thumb on production environments, again regardless of the amount of RAM the system have, just leave a small swap on the system disk just in case, as space is extremely cheap nowadays.

Regards

[foxdoismil]

Thanks for the help

[bocman]

Hello!
I have 8GB RAM, I'm using zfs (10TB), virtualbox with several VMs, Transmission, SMB, FTP, jail (apache, MySQL).
What size of SWAP should I use?

Thax

[Lord Crc]

I would most definitely create swap, for the simple reason that my server had 16GB RAM, and did not have swap, and crashed hard when it ran out because Transmission suddenly ate up 2GB.

edit: I should stress that my zfs pool was fine, but the server was completely unresponsive and I had to do a hard reset.

[ernie]

I am going to propose you to use the recommended default value that nas4free suggests during installation : the same amount than your ram value, so 8 GB for the swap.

[alexey123]

Swap size can be calculated as:
If server have less 4 G RAM => swap size = 2* RAM SIZE
If server have more then 4G Ram => swap size = RAM SIZE + 2G