From: Farmer, John (John.Farmer@TycoHealthcare.com)
Date: Mon Mar 21 2005 - 11:09:15 EST
Format: Original message followed by summary info.
Original Question:
We have an EVA/SAN that has triggered an alarm because the default disk
group has hit the 95% capacity level. There are 8 disk drives available to
alleviate the problem. The default disk group is quite large. 64 disks
72gb a piece. Adding the 8 drives will bring the allocated level below 95%
and make the total disk population of the one disk group 72 disks. All
disks in the environment are 72gb 10k.
Is there any danger to the file systems becoming unavailable while the SAN
performs operations that will be incurred by the introduction of the 8 empty
disks into the disk group?
The quick facts about the environment are:
EVA: HSV110
Software version: 3010
Number of hosts: 1 Tru64 Unix 5.1a pk6 GS160.
Number of filesystems: 70+
Disk group size: 4,204.46 gb
Amount allocated: 3,995.81 gb
% allocated: 95.0374 %
Free space in group: 208.00 gb
Number of vdisks: 72
Vdisk type: Vraid1
Physical disks: 64 (before grouping)
Physical disks: 72 (after grouping. i.e. 64+8)
Physical disk occupancy: approximately 62.43gb per each of the 64 disks.
Any insight would be much appreciated.
SUMMARY:
Thanks to the following folks:
Bill Pappas
Reges Carlier
Raul Sossa
Walter North
Tom Webster
Rob Leadbeater
Tim Brown
Everyone listed above advised me that they have been through the process of
grouping disks into a well populated disk group without incident. This was
very comforting to hear. Some indicated that they generally wait until a
slow time to add disks and they preferred to add the disks in pairs
separated several hours apart.
Tom Webster further pointed out to me that there were newer versions of the
EVA software available and that I might wish to consider upgrade.
John Farmer, Senior Systems Programmer
Tyco Healthcare/US Surgical
150 Glover Ave
Norwalk, CT 06856
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