Inside System Storage -- by Tony Pearson

Tony Pearson Tony Pearson is a Master Inventor and Senior IT Specialist for the IBM System Storage product line at the IBM Executive Briefing Center in Tucson Arizona, and featured contributor to IBM's developerWorks. In 2011, Tony celebrated his 25th year anniversary with IBM Storage on the same day as the IBM's Centennial. He is author of the Inside System Storage series of books. This blog is for the open exchange of ideas relating to storage and storage networking hardware, software and services. You can also follow him on Twitter @az990tony.
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Comments (3)

1 Storage commented Permalink

Nice blog explaining the facts about XIV. I like the video. thx Raj

2 storagegorilla commented Permalink

Tony <div>&nbsp;</div> Excellent article - your piece on the union list confirms what we've suspected but never had confirmed (seriously is there any mention of "union list" anywhere outside this blog? Secretive lot, IBMers). <div>&nbsp;</div> A couple of questions though - what form is the union list generated? Where would it be stored? And who has access to it - technician access only? <div>&nbsp;</div> Thanks <br /> SG

3 TonyPearson commented Permalink

SG, <br /> The Union List is a list of LUN names and logical block addresses (LBAs) stored in both cache and the setaside metadata reserved space on the XIV. Here is a sample: <div>&nbsp;</div> volume_name:DDF_VOL_01 LBA:1869824 <br /> volume_name:DDF_VOL_01 LBA:4497408 <br /> volume_name:DDF_VOL_01 LBA:13035520 <br /> volume_name:DDF_VOL_01 LBA:19601408 <br /> volume_name:DDF_VOL_01 LBA:20176896 <br /> volume_name:DDF_VOL_01 LBA:24793088 <div>&nbsp;</div> Anyone with storage admin privileges can generate the list from a Windows or Linux server, PC or workstation that has IP network access to the XIV involved. It is not limited to technicians only. <div>&nbsp;</div> -- Tony <br />

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