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Filesystem Block Size in VXFS greater than 8K

 
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G V R Shankar
Valued Contributor

Filesystem Block Size in VXFS greater than 8K

Hi All,

We have the following online JFS product.

B3929DA B.11.23.0512 HP OnLineJFS (Server)

Is it possible to create a VXFS filesystem with a block size of more than 8K?

I can see that we can create a HFS filesystem with a FS blcok size of 64K.

Thank you.

Ravi.
8 REPLIES
Sameer_Nirmal
Honored Contributor
Solution

Re: Filesystem Block Size in VXFS greater than 8K

It is not possible to create a vxfs filesystem with block size more than 8K as vxfs only supports file system block sizes from 1024 bytes to 8192 bytes.

http://docs.hp.com/en/5971-4772/ch02s02.html
Johnson Punniyalingam
Honored Contributor

Re: Filesystem Block Size in VXFS greater than 8K

Not its not possible,

Thanks,
Johnson
Problems are common to all, but attitude makes the difference
G V R Shankar
Valued Contributor

Re: Filesystem Block Size in VXFS greater than 8K

Hi All,

Can someone please look in to this post?

Cheers,
Ravi.
Johnson Punniyalingam
Honored Contributor

Re: Filesystem Block Size in VXFS greater than 8K

>>Can someone please look in to this post?<<

what happen,???

Above post clear answered your question.

offical documents as per The VxFS Version 5 Disk Layout the maximun block size is 8

http://docs.hp.com/en/5971-4772/apcs04.html#chdbfhfj
Problems are common to all, but attitude makes the difference
G V R Shankar
Valued Contributor

Re: Filesystem Block Size in VXFS greater than 8K

How about version 6 and version 7. Do they support block size greater than 8K.

Cheers,
Ravi.
Matti_Kurkela
Honored Contributor

Re: Filesystem Block Size in VXFS greater than 8K

If you have small files, a large block size will cause more space to be wasted. On the other hand, a block size that is too small may cause the filesystem to use large amounts of space for internal metadata, especially if the filesystem uses simple tables for tracking block allocation.

So the optimal block size depends on the kind of files you'll be storing and the internal structures of the filesystem.

Increasing the block size is just a simple way to "extend" the range of disk sizes the filesystem can handle without significantly updating the filesystem technology.

With VxFS layout version 6 and above, you can create a filesystem of 32 terabytes in size while using the default block size of 1k.

If you increase the block size to to 8k, the maximum filesystem size will be 256 terabytes.

According to some documentation, you may need something called "EBFS license" to create filesystems creater than 32 TB. That same documentation said the current supported maximum size is 40 TB (i.e. that was probably the largest configuration HP had tested and found good at the time of writing that documentation).

If you need to create >32 TB filesystems and your system is covered by a HP support agreement, it might be a good idea to talk about this with HP support first. They may have more information about latest supportability tests than is publicly available.

MK
MK
Sameer_Nirmal
Honored Contributor

Re: Filesystem Block Size in VXFS greater than 8K

Event with disk layout version 6 or latest 7 the maximum block size is still limited to 8K.

http://sfdoccentral.symantec.com/sf/5.0/hpux/manpages/vxfs/mkfs_vxfs_1m.html

"bsize must be a power of 2 selected from the range 1024 bytes to 8192 bytes."
G V R Shankar
Valued Contributor

Re: Filesystem Block Size in VXFS greater than 8K

The maximum block size of a VXFS fs is 8K

Thank you for all the posts.