When managing large diverse SAN fabrics, it is extremely important to assign a unique and descriptive name to each switch. This descriptive name provides an easy way to determine the purpose of a switch, and is also helpful when debugging problems. To change the name assigned to a Brocade switch, you can use the switchname […]
How to Change the name of a Brocade switch ? Read More »
HP-UX 1. Rescan the devices: ioscan -fnC <disk|tape> 2. Generate device files: insf -e 3. Verify the new devices: ioscan -funC <disk|tape> AIX 1. Rescan the devices ): cfgmgr -vl fcsx Where x is FC adapter number 2. Verify the new devices: lsdev -Cc <disk|tape> Linux The rescan in Linux is HBA-specific. For QLogic: echo
How to Rescan new LUN’s added in Linux, HP-UX, Aix, Solaris ? Read More »
I will provide a calculation example for calculating the required spindles in combination with a known skew. No capacity will be addressed in this post, where I will base it purely on IOPS / throughput and apply it to a mixed FAST VP pool. We all know about the write penalty which is the following:
IOPS calculation for your FAST Pool Read More »
What is IOPS? IOPS (Input Output Per Second) is a common performance metrics used for comparing/measuring the performance of Storage systems like HDD, SSD, SAN. Quick Calculation sheet RPM IOPS 15 K 175 IOPS 10 K 125 IOPS 7.2 K 75 IOPS 5.4 K 50 IOPS How to Calculate IOPS requirement? We will consider the
Today while migrating SAN i face this issue, hope it will help others too… The system panic during boot logging the error: {0} ok boot 56024-disk Boot device: /virtual-devices@100/channel-devices@200/disk@1 File and args: SunOS Release 5.10 Version Generic_147440-01 64-bit Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights reserved. NOTICE: zfs_parse_bootfs: error 19 Cannot mount
System Panic During Boot Logging the Error “NOTICE: zfs_parse_bootfs: error 19” Read More »
DS_300B_234:admin> date Tue Dec 31 06:43:16 UTC 2013 DS_300B_234:admin> tstimezone Time Zone Hour Offset: 0 Time Zone Minute Offset: 0 DS_300B_234:admin> date Tue Dec 31 06:45:59 UTC 2013 DS_300B_234:admin> tstimezone –interactive Please identify a location so that time zone rules can be set correctly. Please select a continent or ocean. 1) Africa 2) Americas 3)
Brocade SAN Switch NTP Setting the date and time Read More »
You can run into an issue with EMC storage on AIX systems using MPIO (No Powerpath) for your boot disks: After installing the ODM_DEFINITONS of EMC Symmetrix on your client system, the system won’t boot any more and will hang with LED 554 (unable to find boot disk). The boot hang (LED 554) is not
EMC and MPIO in AIX Read More »
In first sheet put hostname and wwn, then get output of commands in last sheet.. Just login using putty to san switch and paste it…and magic done. SAN CLI ZONE Creation SAN CLI ZONE Creation without Password
Broacde San Zone Cli is easy now with my magic excel / script Read More »
LUNz is the logical unit number that an application client uses to communicate with, configure and determine information about an SCSI storage array and the logical units attached to it. The LUN_Z value shall be zero. LUNz has been implemented on CLARiiON arrays to make arrays visible to the host OS and PowerPath when no
AIX LUNs(LUNz) presented to host? Read More »
SDD is designed to support the multipath configuration in the ESS. The software used to balance ESS I/O traffic across all adapters. It provides multiple access to data from the host. when using sdd cfgmgr is run 3 times (cfgmgr -l fcs0, cfgmgr -l fcs1, cfgmgr (the third one builds the vpaths)) 3 policies exist
AIX SDD (subsystem device driver) Read More »