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paging_space
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Could paging space increases be simplified?
On AIX, changing a file system size is a breeze. Here's how to increase the /myfs file system by 1 GB: chfs
-a size=+1G /myfs And you can decrease it - on the fly - using a minus sign. Let's reduce it by 750 MB: chfs -a size=-750M /myfs You can leave AIX to work out how that rounds up or down in terms of the underlying logical volume's logical partitions. It's all handled under the covers by the chfs command . With paging space, it's a little less user-friendly. To increase paging space (which, let's face it, is the usual... [More]
Tags: paging_space file_systems |
Keeping hd6 as default paging space - part 2
Some time ago I experimented with removing the default paging space /dev/hd6 from an LPAR and creating a separate volume group for paging space . This worked ... until I had to restore a mksysb backup, as you may recall from this blog pos t. Well, what about creating a separate paging space in rootvg instead of in a separate volume group, and then removing hd6? Not exactly sure why you'd do that, but I suppose if you were to create a smaller paging space to replace hd6, in case it's been extended too much, that might be a reason. Whatever... [More]
Tags: paging_space hd6 |
Keep hd6 default paging space
There's nothing like running out of paging space to bring an AIX system to its knees, but I hit an unexpected paging space limitation today when I was trying to restore from a mksysb backup. I didn't run out of paging space - I didn't get the chance! When I tried restoring from a mksysb backup, I couldn't get past the initial bosinst menus. I hit this error: Error Warning image.data has
invalid logical volume data. Can not continue. To reboot the
system, press reset. >>> 1 Continue with Install In fact, the Continue with... [More]
Tags: hd6 swap install paging_space mksysb |
LPAR profiles: Minimum, Desired and Maximum memory settings
MEET MIN, MAX and DES When you create an LPAR (Logical Partition), you have to create a profile to specify the processors, memory and I/O slots you want to allocate. I’m going to focus on memory right now, and specifically what the minimum , desired and maximum memory settings mean. You’ll see that the memory allocation can change while the LPAR is up and running using Dynamic LPAR (DLPAR) and DLPAR's can only go as low as min and as high as max. Makes sense, doesn't it? This is about setting up LPARs that use dedicated memory . I’m not... [More]
Tags: paging_space active_memory_sharing profile shutdown dedicated_memory memory vios adapter activate required desired hmc partition active_memory_expansion minimum lpar hardware_management_conso... maximum aix |
Make way for rootvg!
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TRACING YOUR ROOTS Every AIX system has a volume group (a logical group of disks) called rootvg, which is created automatically at
the time you install AIX. The rootvg may be made up of one or several physical disks or virtual disks (SAN LUNs, Logical volumes on the VIO Server). Whatever "disks" make up rootvg,... [More]
Tags: file_systems delivering_baby chfs logical_volume_manager paging_space obstetrics_down_under volume_group multibos dump_devices size rootvg lvm aix |
