By Volker Herminghaus, Albrecht Scriba
Garage administration in information facilities is helping directors take on the complexity of information middle mass garage. It exhibits the best way to make the most the potential for Veritas garage origin by way of conveying information regarding the layout suggestions of the software program in addition to its architectural history. instead of purely showing how to use garage origin, it explains why to use it in a specific means, in addition to what is going on inside of. Chapters are cut up into 3 sections: An introductory half for the beginner person, a full-featured half for the skilled, and a technical deep dive for the professional specialist. an in depth troubleshooting part exhibits the way to repair issues of volumes, plexes, disks and disk teams. A photograph bankruptcy provides specific directions on easy methods to use the main complicated point-in-time copies. A tuning bankruptcy can assist you accelerate and benchmark your volumes. And a different bankruptcy on cut up information facilities discusses latency concerns in addition to distant mirroring mechanisms and cross-site quantity maintenance. All issues are coated with the technical understand how gathered from an aggregate thirty years of expertise in consulting and coaching in info facilities worldwide.
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Additional resources for Storage Management in Data Centers: Understanding, Exploiting, Tuning, and Troubleshooting Veritas Storage Foundation
G. due to temporary power outage of a disk or a disk array (simulated by restoring the private region data). Now the big surprise! To recover from temporary disk outage, we just need to modify step 1 and skip step 3: 1. g. by powering on the disk or the disk array. As already mentioned, VxVM does not monitor disk availability (it only monitors path availability according to your DMP configuration), so nothing happens to the VxVM disk and disk group states. 2. Initiate a test for device access to inform VxVM that the disk has come back.
But we fixed the size of the private region as configuration container by 1 MB (= 2048 sectors), therefore 4712 - 2048 = 2664 sectors should be available for new subdisks (1 sector already in use by the Ghost subdisk). We remember that in most cases the "Cannot allocate space" error message is misleading: There is enough space, but layout restrictions would be violated. The current layout restriction is the default diskalign attribute of vxassist enforcing subdisk creation at cylinder boundaries.
Are you ready to exclude a power failure of the disk array? 363 Troubleshooting Even if you neatly spread your disks over more than one array, you cannot deny the possible risk to loose your disk group configuration. If one array fails temporarily, VxVM automatically switches all its active disk group configuration disk roles to the remaining array. If the first mentioned disk array comes back, all active configuration disks are kept at the latter array! Now that array suffers from a power failure or, even worse, gets damaged...
Storage Management in Data Centers: Understanding, Exploiting, Tuning, and Troubleshooting Veritas Storage Foundation by Volker Herminghaus, Albrecht Scriba