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Describe the new debug flags DEBUG_EOFINFO and DEBUG_MEMFREE.

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Fix a confusion between slices and partitions.

Clarify the problems of small stripe sizes (< 128 kB).
This commit is contained in:
grog 1999-03-13 07:45:52 +00:00
parent 04a3606b9e
commit ca26aeffd1
1 changed files with 10 additions and 9 deletions
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19
sbin/vinum/vinum.8
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@ -374,6 +374,12 @@ Keep a circular buffer of last requests.
.It DEBUG_REVIVECONFLICT (16)
.br
Print info about revive conflicts.
.It DEBUG_EOFINFO (32)
.br
Print information about internal state when returning an EOF on a striped plex.
.It DEBUG_MEMFREE (64)
.br
Maintain a circular list of the last memory areas freed by the memory allocator.
.It DEBUG_REMOTEGDB (256)
.br
Go into remote
@ -668,14 +674,8 @@ the configuration in order from the most recently updated to least recently
updated configuration.
.Nm
maintains an up-to-date copy of all configuration information on each disk
partition. You must specify all of the partitions in a configuration as the
partition. You must specify all of the slices in a configuration as the
parameter to this command.
.Nm
.Nm read
accepts the names of non-Vinum partitions, so you can specify all partitions
upon which a
.Nm
partition might be resident to this command.
.Pp
The
.Nm read
@ -1018,8 +1018,9 @@ integer), and it must be a multiple of a disk sector (512 bytes).
.sp
For optimum performance, stripes should be at least 128 kB in size: anything
smaller will result in a significant increase in I/O activity due to mapping of
individual requests over multiple disks. The increase in concurrency due to
this mapping will not make up for the increase in latency. A good guideline for
individual requests over multiple disks. The performance improvement due to the
increased number of concurrent transfers caused by this mapping will not make up
for the performance drop due to the increase in latency. A good guideline for
stripe size is between 256 kB and 512 kB.
.Pp
A striped plex must have at least two subdisks (otherwise it is a concatenated