Tag Archives: Storage

Offline migration – minimizing downtime with rsync

12/01/2011 – 12:12

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 be eliminated, you can do some things to minimize it. First, create the new filesystem layout [...]

By Viktor Balogh | Posted in Backup & Restore, HP-UX system administration, Storage | Also tagged , , , , | Comments (0)

HSSM CIM extension install

17/08/2010 – 12:47

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 the version of your OS. It may be that these are now obsoleted by newer patches, so it might worth a look [...]

By Viktor Balogh | Posted in HP-UX general, HP-UX system administration, Storage | Also tagged , , , , | Comments (0)

Changing the queue_depth parameter

25/05/2010 – 13:51

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 suffer if certain scsi parameters aren’t set. Here is an HP document that describes how you can solve this problem:

By Viktor Balogh | Posted in HP-UX, HP-UX system administration, Storage | Also tagged , , , , | Comments (0)

Migrating a ServiceGuard cluster to another storage

03/11/2009 – 14:44

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 target LUN

By Viktor Balogh | Posted in HP-UX Serviceguard, HP-UX system administration, Storage | Also tagged , , , , , , , , | Comments (0)

Business Copy unleashed

24/07/2009 – 23:28

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 oracle to be prepared for the backup (no more write queries for the next x minutes), after that pairs the [...]

By Viktor Balogh | Posted in HP-UX system administration, LVM and VxVM, Storage | Also tagged , , , , | Comments (1)

Calculating the HW path for a LUN

08/05/2009 – 12:02

Ensure that the LUN number is represented in decimal; an HP XP disk array uses hexadecimal LUN numbers while an HP VA disk array uses decimal LUN numbers. The Virtual SCSI Bus starts at address 0. If LUN number is < 128 (dec) then go to step 7 below Increment Virtual SCSI Bus by 1 [...]

By Viktor Balogh | Posted in Hardware, Servers, Storage | Also tagged , , | Comments (0)

Understanding the HW path of SAN disks

08/05/2009 – 09:19

A line from the ioscan output: Class       I  H/W Path       Driver    S/W State   H/W Type     Description ============================================================================= disk      224  0/3/1/0/4/0.1.64.0.0.2.0    sdisk     CLAIMED     DEVICE       HITACHI DISK-SUBSYSTEM <HBA/Interface card> 0/3/1/0/4/0 <Domain (~switch number)> 1 <Area (physical port number)> 64 <Port (always o in a switched fabric)> 0 <Virtual SCSI Bus> 0 <SCSI target> 2 <SCSI LUN> 0 [...]

By Viktor Balogh | Posted in Hardware, Servers | Also tagged , , | Comments (1)