[san-tech][02547] ZFS ZIL Accelerator board

Date: Tue, 17 Aug 2010 08:40:01 +0900
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Solaris ZFSだったら metadataではなく、利用頻度に応じて配置してくれる
はずなので、調べてたらこんなボードが発売されてました：

DDRdrive X1:
  http://www.ddrdrive.com/
Product Brief
  http://www.ddrdrive.com/ddrdrive_brief.pdf
Product Benchmark
  http://www.ddrdrive.com/ddrdrive_bench.pdf

PCI Expressボードに
  4GB DRAM
  4GB SLC NAND (4GB DRAM Backup 60秒)
というもので、Windows系の Driver Softも提供していますが、Solaris ZFS
Hybrid Storage Pool (HDD/SSD混在環境) の ZFS Intent Log (ZIL) をターゲット
としたボードです。



容量が少ないのはしょうがないのですが、ボードが
  http://www.ddrdrive.com/ddrdrive_x1_p1.png
と厚く、かつ DRAMから NANDへのバックアップ用に外部電源 (UPS等) が必要に
なります。

Oracle (Sun) OpenStorage: Sun Storage 7000開発者の Blog
"A Logzilla for your ZFS box", Monday Jul 19, 2010
  http://blogs.sun.com/ahl/entry/ddrdrive

  "A key component of the ZFS Hybrid Storage Pool is Logzilla, a very fast
   device to accelerate synchronous writes. This component hides the write
   latency of disks to enable the use of economical, high-capacity drives.
   In the Sun Storage 7000 series, we use some very fast SAS and SATA SSDs
   from STEC as our Logzilla" ... "The most important attribute of a good
   Logzilla device is that it have very low latency for sequential, uncached
   writes. The STEC part gives us about 100μs latency for a 4KB write"

Performance
  "I put the DDRdrive X1 in our fastest prototype system to see how it
   performed. A 4K write takes about 51μs ? better than our SAS Logzilla -
   but the SSD outperformed the X1 at transfer sizes over 32KB"

ただし、その大きさや外部 UPSの必要性から、製品への組み込みは見送られた
とのことです。

"Hybrid Storage Pools in CACM", Jul 01, 2008
  http://blogs.sun.com/ahl/entry/hybrid_storage_pools_in_cacm
Sun Unified Storage
  http://www.oracle.com/us/products/servers-storage/storage/unified-storage/index.html
Oracle Solaris White Papers
  http://developers.sun.com/solaris/whitepapers/

ところが、すでに OpenSolarisの継続は中止され
"[osol-discuss] OpenSolaris cancelled, to be replaced with Solaris 11 Express "
 Aug 13, 2010
  http://opensolaris.org/jive/thread.jspa?messageID=496203&tstart=0
"OpenSolaris axed by Ellison", 13th August 2010
  http://www.theregister.co.uk/2010/08/13/opensolaris_is_dead/

DTraceの三勇士の一人の Bryan Cantrill氏は既に Oracleを去りました。
Bryan Cantrill氏の新しい Blog
  http://dtrace.org/blogs/bmc/
"Good-bye, Sun", July 25, 2010
  http://dtrace.org/blogs/bmc/2010/07/25/good-bye-sun/
新しい職場
"Joyent Names Bryan Cantrill Vice President of Engineering", JULY 28, 2010
  http://www.joyent.com/2010/07/joyent-names-bryan-cantrill-vice-president-of-engineering/
Joyent
  http://www.joyent.com/

等々色々ありましたが、新しいコミュニティがうまれました
Illumos
  http://www.illumos.org/
This is the home of the Illumos project, a community maintained derivative of
the OpenSolaris ON source, including open source replacements for closed bits,
and additional changes.

"Illumos, Hope and Light Springs Anew"
 Garrett D'Amore, Nexenta Systems, Inc.
 August 3, 2010
  http://www.illumos.org/attachments/download/3/illumos.pdf

重要なのは
"Not All of OpenSolaris is Open Source" (3枚目)
 Critical components closed source
   libc_i18n (needed for working C library)
   NFS lock manager
   Portions of crypto framework
   Numerous critical drivers (e.g. mpt)
FAQ
  http://www.illumos.org/projects/site/wiki/FAQ
"Illumos sporks OpenSolaris", 3rd August 2010
  http://www.theregister.co.uk/2010/08/03/illumos_opensolaris_spork/

個人的にはこっちの記事がショックでした
"Oracle chops Sun HPC jobs", 5th August 2010
  http://www.theregister.co.uk/2010/08/05/sun_hpc_cuts_systems/

  "While details are scarce - just the way Oracle likes it - El Reg
   hears from sources familiar with the matter that layoffs took
   place last week, with most of the HPC sales force let go and the
   remainder redeployed peddling Oracle's Exadata V2 data warehousing
   and online transaction-processing clusters."

ある程度は予想されていたことかもしれませんが。