Re: insufficient space in super block for rotational layout

Jim Seymour <jseymour@xxxxxxxxxxx> wrote:
G'day everybody,

Environment:

Sun Sparc Solaris 8 Generic_108528-29 on an E250
Infortrend EonStor 1.4TB RAID 5, U320 SCSI host connection

When I go to "newfs" the filesystems, I'm getting

Warning: insufficient space in super block for rotational
layout tables with nsect sblock.fs_nsect and
ntraksblock.fs_ntrak. (File system performance may be
impaired.)

I've searched and searched, and can find nothing more than what
"man mkfs_ufs" offers, by way of explanation:

Occurs typically on very high density disks. On
such disks, the file system structure cannot
encode the proper disk layout information, result-
ing in suboptimal performance.

I don't know what Sun means by "very high density," but many of the
filesystems aren't all *that* big. The system isn't here (I'm at
home and the system's at work, and down atm), but I'm *pretty* sure
I'm getting this error on all the filesystems, from a few-hundred gig
down to a few hundred meg.

So the question is: Is this really an issue with a RAID 5 storage
array? A colleague of mine, explaining what the "rotational layout

It doesn't sound like a problem with the array, but the size of the array.
Trying to even define "rotational layout" or disk geometries and interlave
is probably pointless for an array to begin with anyways since actual
location of all sector and cylinders is masked by that Infortrend
controller, and you don't even get to talk directly to the disks
themselves, which are probably spinning out of sync with each other
anyways.

table" is and how it's used, suggests not. He suggests that, even if
there would be an impact, it would only affect very large files.
(Files that would span more than a cylinder group?) In any event: It
doesn't appear I can do anything about it. (Other than shrinking the
RAID 5 partitions.)


TIA,
Jim
.

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