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SvennD
Asked: 2016-01-15 07:02:11 +0800 CST

ZFS 100TB hardware setup

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We received a quote for the following server setup :

  • Intel Xeon E5-2609V2
  • 2 x WD RE 2TB SATA III
  • 34 x WD RE 4TB SAS II
  • 32 GB memory (ECC)
  • LSI MegaRAID 9271-8i bulk, 8 x SATA III/SAS II internal hardware RAID
  • LSI CacheVault voor 9266-9271 series

We wanne add (directly) a JBOD to that server, half filled with 8TB drives, we can extend later. They suggested :

  • LSI MegaRAID 9380-8e
  • 22 x HGST Ultrastar 8TB He8 enterprise, SAS III

Now this was based on our previous server, which we setup as a ZFS server and did not have much "pleasure" from. (although the configuration was to blame I guess)

I have a few questions about this setup : - The argument to take 2x2TB is, use it as mirror for the system, since when a disk has to be replaced IO is sluggish during rebuild. Speed is not our real problem, space is, also we have a online backup, that will be only used as read platform (during problems). Would 36 x 4TB be a better choice ? (36 = 3*12 disk in a pool) - is 32 Gb memory enough ? (ZFS on linux, taking in consideration the JBOD at max capacity 44*8+32*4) - This is a raid controller, a JBOD/HBA (?) would be a better choice ? If so, what kind of JBOD should I be looking for ? - How would I best setup this system to be "ready" for upgrading the next 22 disks in the JBOD ? (its a 44 disk JBOD, 22 slots are filled)

Some more info based on the comments :

  • uptime/availability: we don't care if it drops out for a few minutes, aslong as this is not all to common. no HA needed. In essence this will be a hot backup for our current storage server. We mainly read and writing is not speed limited. (by far)
  • Reading speed is important but we don't want to give up space for it
  • Write speed is not that important, mostly its streams from machine while large files are written there copy's so it can run overnight.
hardware

2 Answers

  1. I would work with a ZFS professional or vendor who specializes in ZFS-based solutions. You're talking about 100TB of data, and at that scale, there's too much opportunity to screw this up.

    ZFS is not an easy thing to get right; especially when you incorporate high-availability and design for resilience.

    I wouldn't plan on half-filling storage enclosures or anything like that. Expanding ZFS arrays is not something you can do easily with RAIDZ1/2/3, and expanding ZFS mirrors can leave you with unbalanced data.

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  2. I am not sure I would use ZFS on Linux for such a setup, as ZoL remain a somewhat "moving target".

    Regarding your RAID card, if it can be configured in JBOD, there is no problem. However, if it only work in RAID mode, I would change it for a JBOD/HBA adapter.

    Anyway, as suggested by ewwhite, I would ask to a professional ZFS verdor/consultant.

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