Hello All,
I am planning a new server.
The main functions of this server will be:
The secondary functions will be:
The amount of users that will access this server will be: 100 - 150.
The hardware choosen is DELL R515 with:
The filesystem layout could be:
The ZFS storage pool will be put on 6 x 2 TB NL SAS disk using RAIDZ2.
So the available space will be roughly: 4 x 2 = 8 TB.
Notes:
Here I write down some doubts I have about this configuration:
Feel free to recommend other hardware parts or different layout configurations (especially if the system cost will not change so much
).
Thanks in advance to everyone.
I am planning a new server.
The main functions of this server will be:
- personal web pages
- file server (through sftp/samba)
- svn repository
The secondary functions will be:
- backup of personal user data (from desktop PC)
- store VM images
The amount of users that will access this server will be: 100 - 150.
The hardware choosen is DELL R515 with:
- 2 x AMD Opteron 4184 2.8 Ghz
- 16 GiB RAM DDR3 1333 Mhz (4x4 GiB sticks)
- Redundant PSU
- Controller PERC H200 flashed in IT mode (mps(4) driver)
- 6 x 2TB Seagate Nearline SAS 7.2K rpm (for data)
- 1 x Vertex 3 SSD 240 GB (for ZFS cache)
- 1 x Intel SSD 32 GB with SLC memory (for ZIL)
- 2 x 8GB USB keys (for O.S.: FreeBSD-8 Stable, mirrored)
The filesystem layout could be:
- the base system / and /usr on the read-only, mirrored USB sticks.
The mirror is done by using gmirror and UFS - /usr/local, /usr/ports, /usr/obj, /var on ZFS pool
- /home and other storage-like folders on ZFS pool
- /tmp in swap-memory
The ZFS storage pool will be put on 6 x 2 TB NL SAS disk using RAIDZ2.
So the available space will be roughly: 4 x 2 = 8 TB.
Notes:
- I want have the base system on UFS on a separate disk for manageability reasons (updates, upgrades, etc.).
- I already own the 32 GiB SSD SLC disk, so I can reuse it, while the rest of the hardware is to be bought.
Here I write down some doubts I have about this configuration:
- 16 GiB of RAM will be enough to manage the proposed functions, users, and storage space ?
- 240 GB of ZFS cache on SSD will be in the right ratio with the 16 GiB of RAM memory and the 8 TB of storage size ?
- 32 GB of ZIL on a single SSD SLC is ok ? Or you recomend to mirror it on a slice of the Vertex 3 ?
- Given the recomandation of setting the size the ZIL equal to 1/2 of RAM, 8 GB should be enough, right ?
- In this case, is better to move the OS on the SSD SLC disk (making a mirror with the VERTEX 3 ?) ?
4.a.1 In this case is a problem (for the ZIL) making a mirror of different type of devices ? - With regards of the requested functions, there is any performance hit having OS on memory sticks instead of SSD ?
- From a reability standpoint, is better to have the O.S. on memory sticks or on SSDs ?
- In this case, is better to move the OS on the SSD SLC disk (making a mirror with the VERTEX 3 ?) ?
- It could be better to not use the 32 GB SSD SLC, and but 2 x 120 GB vertex 2 to put in raid0 for ZFS cache and raid1 for ZFS ZIL ?
- Using ZFS Cache and ZFS Zil on the same device can produce a performance hit ?
- Intel 320 SSD has capacitors which could be more suitable for ZIL.
- It could be better to use this instead SSD SLC ? Or
- Do you reccomend a couple of this (without buying VERTEX 3) ?
- /tmp in swap-memory is compatible with using ZFS ?
Feel free to recommend other hardware parts or different layout configurations (especially if the system cost will not change so much
).Thanks in advance to everyone.