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...
View ArticleMigrating 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...
View ArticleChanging 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...
View ArticleHSSM 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...
View ArticleSome 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...
View ArticleOffline 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...
View ArticleCheatsheet: 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....
View ArticleChecking 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...
View ArticleSamsung 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...
View ArticleImporting 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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