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тАО02-03-2010 11:23 AM
тАО02-03-2010 11:23 AM
Will having no parition table be a bad thing?
Similarly -- if I use disks under Oracle ASM -- is there really a need to partition the disks?
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тАО02-04-2010 02:11 AM
тАО02-04-2010 02:11 AM
SolutionThat said, a disk that has been pvcreate'd as a whole disk or given to ASM will look like an unformatted disk to, for example, a Windows installation program.
If there is a chance that your disks might be visible to a Windows system (e.g. a big centralized SAN storage), it might be prudent to create the partition table: it will allow non-Linux systems to detect that the disk is in use, in case your disks are ever accidentally presented to them.
Traditionally, a partition must begin at the beginning of a cylinder. Modern disks don't really have a simple C/H/S geometry any more, but when you create a partition table, the entire first cylinder is dedicated to MBR. So when you omit the partition table, a little less disk space is wasted... but if you have a 160 GB disk, do you care about 80 MB or so?
MK
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тАО02-04-2010 03:27 AM
тАО02-04-2010 03:27 AM
Re: Do I need to Partition a Disk that will be fully used Anyway?
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тАО02-04-2010 06:19 AM
тАО02-04-2010 06:19 AM
Re: Do I need to Partition a Disk that will be fully used Anyway?
On my vMware cirtualized Linux server - I notice that I cannot forcefully pvcreate a whole vMware virtual disk. It only allows me to pvcreate if I partition it.
However on my Physical Linux Servers where my disks are SAN based and multipathed -- /dev/dm-NN -- I can. I wonder why.
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тАО02-04-2010 06:57 AM
тАО02-04-2010 06:57 AM
Re: Do I need to Partition a Disk that will be fully used Anyway?
For the OS partition, yes you need to partition.
Smart partitioning makes it harder for a single problem to fill up the root file system and halt the system.
For an ASM disk, that is not booting the system, it makes no difference at all. Oracle wants to rule this universe and if you have to use ASM your DBA's will be managing space on that disk.
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