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Business Copy unleashed

Today we had some trouble with a cluster using Business Copy for backing up the data while the application is running. There is a framework for the automatic conduction of the backup process: it tells...

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Migrating a ServiceGuard cluster to another storage

Here are the steps for offline migrating a Serviceguard cluster to another SAN: create a LUN list:no. of source box no. of source LUN size of source LUN no. of target box no. of target LUN size of...

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Changing the queue_depth parameter

Finally we can get some unusual large LUNs at my customer, but this arose some problems that we didn’t have until now. The read/write performance of a filesystem built from such very large LUNs can...

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HSSM CIM extension install

This guide about installing HP Storage Essentials CIM Extension on HP-UX 11i v1. The following patches are the minimum prerequisites you need to have installed on the system, it may vary depending on...

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Some thoughts about mediainit – low level formatting and why it mustn’t be done

mediainit is neither required nor recommended for most modern disks. In fact, mediainit might damage some (semi-)modern disks. Even the most basic SCSI disks today have a built-in defect management...

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Offline migration – minimizing downtime with rsync

As we all know, downtime is an unavoidable must in some cases. There may be cases when the application need to be migrated to a new system, and it can only be done offline. Even if the downtime can’t...

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Cheatsheet: EMC Powerpath on HP-UX

The latest 11.31 HP-UX version uses native multipathing with the help of the new IO stack. However if you’re on an older version, it was common along many customers to get a Powerpath license from EMC....

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Checking the status of multipathing in 11iv3

A common task in a sysadmin’s life is to assist to the changes which are affecting the SAN network. At smaller organizations it could be that besides the system administrator role you also need to...

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Samsung SSD 840 EVO Performance Restoration on Linux

As you probably all know there was a bug in the firmware of the Samsung 840 EVO SSD drives. After a month of using performance drops heavily while accessing non-changing data. Samsung has finally...

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Importing IOMeter results.csv into Excel

Since I always forget the exact steps here is a list of the steps as a note to self: Rename the results.csv to results.txt Open MS Excel File > Open > Text files type Data type delimited Next...

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