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Recent content by madilyn

  1. M

    Recommended processor for ZFS head node?

    @drescherjm, raiderj, drescherjm Yes, a zpool really just implies a stripe across multiple vdevs, so I meant a zpool of multiple (I'm planning on 6 per vdev but haven't benchmarked) RAIDZ-2 vdevs and a zpool of 6 three-way mirror vdevs.
  2. M

    Recommended processor for ZFS head node?

    @dan and patrick Thanks so much for your input. Now that I think about it, the Xeon E5-2643v2 and E5-2637v2 are the perfect processors for the build. This seems to be the descending order of best processors for a ZFS build. The E5-2637v2 pricing pretty much makes the E5-2643 obsolete, while the...
  3. M

    Recommended processor for ZFS head node?

    I am assembling a pair of ZFS head nodes, that will serve a small 128+ core cluster consisting of about 8-12 servers. The head nodes will serve 1 RAIDZ-2 zpool (roughly 60 disks = 240 TB raw disk space) and 1 three-way mirror zpool (roughly 18 disks = 10 TB) in active/passive redundancy and I...
  4. M

    Antec HCG-520M vs TP-550C

    Haha, that's how I feel. :(
  5. M

    Antec HCG-520M vs TP-550C

    I have the choice of these two for a build that only peaks at 280W: Antec High Current Gamer HCG-520M Antec TruePower Classic TP-550C ($5 more) Which should I pick? I can't find much information about the TruePower Classic series - I'm guessing this is also a Seasonic OEM. In that...
  6. M

    Reliable cooling for 24/7 overclocking of Xeons in server chassis

    What's reliable cooling system that I could use for overclocking an Ivy Bridge Xeon for a 24/7 2U server setup? I get the feeling that passive heatsinks from Supermicro won't be enough. I have a good opinion of Corasir H80/H100's but getting them to fit 2U is probably impossible. (P.S.: I know...
  7. M

    PCIe-based SSD for L2ARC?

    Has anyone used PCIe-based SSDs like the OCZ Z-Drive R4, Intel 910 or OWC Mercury Accelsior E2 for their L2ARCs? These seem to extract extraordinary performance for value, but I haven't seem many ZFS builds that use them. Any opinions? I see a few caveats... For example, the Intel 910 card...
  8. M

    Using consumer SATA SSDs for ZFS

    Let me know what you find, I'd be interested to know! I guess I have too much faith in commodity-off-the-shelf parts. I worked on a different team - but when I was at Google, I noticed that we had a LOT of c-o-t-s SATA disks and we didn't have a problem. The high-level strategy was to invest...
  9. M

    Using consumer SATA SSDs for ZFS

    Could you elaborate? It seems the M500 doesn't have a volatile write cache so even if you lose power in the middle of a write, there's nothing that needs reserve power to be flushed onto permanent storage. The article that you linked suggested only the S3500 and S3700 have power loss protection...
  10. M

    Using consumer SATA SSDs for ZFS

    Just another thought: http://www.anandtech.com/show/6614/microncrucial-announces-m500-ssd-line-of-ssds I realized that the M500s eliminate the data loss issue faced by consumer SATA SSDs by having both a regular capacitor and no write cache at all. I'm very certain that I will experience fewer...
  11. M

    Using consumer SATA SSDs for ZFS

    @raiderj: Thanks a lot! This narrows down my options... I'm thinking that a PCIe SSD may be a better L2ARC device than a regular SAS SSD. There are a few competitively priced choices of PCIe SSDs: OWC Mercury Accelsior E2, Intel 910, OCZ Z-Drive R4 C-series (no supercapacitor version), but I'm...
  12. M

    Using consumer SATA SSDs for ZFS

    HGST Ultrastar 15K600: http://www.tomshardware.com/reviews/enterprise-storage-sas-hdd,2612-6.html Here's its nearline sister: http://www.storagereview.com/hgst_ultrastar_7k4000_enterprise_sas_hdd_review Thanks! My workload is a Postgres database, about 60 tables. 30 tables -> 100 GB 1 table...
  13. M

    Using consumer SATA SSDs for ZFS

    OK. Awesome, that's great to know. Am I correct to say this is fine even if I stripe the L2ARC disks? Not at all, just some Fermi estimates: Each spindle averages about 200~300 random IOPS versus a regular SSD which is about 20,000 random IOPS. Just back-of-the-envelope, I imagine I'll...
  14. M

    Using consumer SATA SSDs for ZFS

    Thanks! Very interesting, I didn't think of building a huge L2ARC. My initial thoughts were that my use case is very random IO-intensive. This means 1 problem: The L2ARC scales by striping, so I'd indeed need to stripe 6-7 disks for the L2ARC to achieve similar random IOPS performance as a 6-7...
  15. M

    Using consumer SATA SSDs for ZFS

    Mm, good, I think I'll get 840s. Only thing I don't like about them are the 512 GB capacity limits. Without a separate JBOD (since I'm not using an expander) or makeshift cabling workarounds, I'm probably limited to the number of disk bays on a single chassis per file system. I'm thinking of...
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