By Volker Herminghaus, Albrecht Scriba
Garage administration in facts facilities is helping directors take on the complexity of information middle mass garage. It exhibits tips to make the most the potential for Veritas garage origin by means of conveying information regarding the layout techniques of the software program in addition to its architectural history. instead of basically showing how to use garage starting place, it explains why to use it in a selected approach, besides what is going on within. Chapters are break up into 3 sections: An introductory half for the amateur consumer, a full-featured half for the skilled, and a technical deep dive for the pro specialist. an in depth troubleshooting part exhibits find out how to repair issues of volumes, plexes, disks and disk teams. A photograph bankruptcy provides specific directions on how one can use the main complex point-in-time copies. A tuning bankruptcy can help you accelerate and benchmark your volumes. And a distinct bankruptcy on break up information facilities discusses latency matters in addition to distant mirroring mechanisms and cross-site quantity maintenance. All themes are lined with the technical know the way gathered from an aggregate thirty years of expertise in consulting and coaching in info facilities around the world.
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Some commands to verify the disk layout and the subdisk position: # vxdisk list c4t8d0 […] public: slice=4 offset=1 len=815175 disk_offset=0 private: slice=3 offset=1 len=4711 disk_offset=815176 […] # vxdg init adg adg01=c4t8d0 cds=off # vxdg -g adg set align=1 # vxdg -g adg free DISK DEVICE TAG OFFSET LENGTH FLAGS adg01 c4t8d0s2 c4t8d0 0 815175 # vxmake -g adg sd adg01-01 disk=adg01 offset=0 len=815175 # vxprint -stg adg SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE […] sd adg01-01 adg01 0 815175 c4t8d0 MODE ENA We immediately recognize a disadvantage of this solution: The public region and the subdisk is one sector smaller than before.
All we can do is to try to stop and restart the applications as quickly as possible. That calls suspiciously for a script running the commands in uninterrupted sequence. Just look at the following command outputs to determine the current state of the partition based "applications" (the file systems each holding a large file are mounted): # prtvtoc […] * 4712 * 7508 * 7506 338 /dev/rdsk/c4t1d0s2 sectors/cylinder cylinders accessible cylinders Manual Encapsulation Walkthrough […] * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 0 00 0 5051264 5051263 /mnt0 1 0 00 5051264 5051264 10102527 /mnt1 2 5 01 0 35368272 35368271 3 0 00 10102528 5051264 15153791 /mnt3 4 0 00 15153792 5051264 20205055 /mnt4 5 0 00 20205056 5051264 25256319 /mnt5 6 0 00 25256320 5051264 30307583 /mnt6 7 0 00 30307584 5060688 35368271 /mnt7 # df -k /mnt?
This is a little bit tricky: # vxdg -g adg rmdisk adg01 VxVM vxdg ERROR V-5-1-552 Disk adg01 is used by one or more subdisks. Use -k to remove device assignment. Of course, we cannot remove a disk group member still in use by subdisks, even if these subdisks are physically unusable. But they are still known to the disk group configuration. We need to keep (-k) the disk group membership and the configured disk attributes by "detaching" the disk from the disk group, that is, to remove only the device assignment: # vxdg -g adg -k rmdisk adg01 This disk now looks like a failed disk except for the object states: REMOVED instead of NODEVICE.
Storage Management in Data Centers: Understanding, Exploiting, Tuning, and Troubleshooting Veritas Storage Foundation by Volker Herminghaus, Albrecht Scriba