From: Mike Hudson (mjhudson@uwaterloo.ca)
Date: Mon Jun 03 2002 - 16:41:55 EDT
I *really* wanted to know the maximum *fileset* size under UFS (although I
said *partition* size -- see original message below) and number of
partitions.
Thanks to Alan Rollow for the follwoing ...
>The file system size limits are based on testing and real experience
>of people trying to use larger. UFS has the 128 GB size limit, though
>that's largely a testing limit. AdvFS has separate limits, which I
>think were beyond 128 GB in late V4. Some limited testing I did on
>a early (maybe field test) V5 system with a large array suggests
>UFS has other limits out beyond 512 GB. Just a hair under 1 TB
>certainly had problems.
>The limited on number of partitions is 8, though there are practical
>reasons for only using 7. Using LSM you can slice up a large space
>into an arbitrary (something large anyway) number of smaller volumes.
>The reason for only using 7 partitions is that to change the size or
>offset of a partition you have to open the disk with some other
>partition; to change A you have to use C, to change C, use A. The
>partition opened also has to start at disk LBA 0, where the disk
>label is. If you use 8 partitions, only one will be able to start
>at LBA 0 and you can't use it to repartition.
--- Alan also suggested looking at the Software Product Description on the DU 4.0E CD-ROM. Unfortunately I couldn't find an exact number there. In the end, my solution was to use AdvFS for this RAID. Original message: > I have a new 1 Tb RAID which I am trying to partition. My > system is a DS20E running Digital Unix 4.0E. > > I remember reading somewhere (but can't find the reference) that the > maximum partition size useable by Digital Unix is 128 Gb. If so I can > just make this work by creating 8x128 Gb partitions. On this board it was > stated that the maximum partition size under V5.1A was 1 Tb. > > I have searched through Compaq documentation to clarify this but with no > luck so far. I would appreciate it if someone could confirm whether the > 128 Gb number is correct for Digital Unix 4.0E. I would like to have some > smaller partitions for various purposes, and it seems that I am limited > to having only a-h i.e. 8 partitions max, so if indeed 128 is teh max > there is limited flexibility. -- Mike Hudson Dept. of Physics Tel: +1-519-888-4567 x2212 Univ. of Waterloo Fax: +1-519-746-8115 Waterloo, ON N2L 3G1 http://astro.uwaterloo.ca/~mjhudson
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