3.1.2 Matrix Server RHEL4 Release Notes

PolyServe Matrix Server Release Notes 17

9615 Nodes stall waiting for locks

If you are seeing alerts stating that nodes are stalled waiting for

locks for a particular filesystem, the filesystem may be

experiencing contention on Full Zone Bitmaps. To aid in

diagnosing this problem, determine whether the following

apply:

• Full Zone Bitmaps (FZBMs) are enabled on the filesystem.

• Filesystem operations that involve allocating or freeing

blocks are slower than on previous versions of the

filesystem.

• The workload on the filesystem is doing allocations or frees

from multiple nodes at once.

To determine whether FZBMs are appropriate for your

filesystem, review the guidelines in the PolyServe Knowledge

Base article “Using the FZBM On-Disk Filesystem Format.”

10113 Matrix Server cannot detect all imported disks

If Matrix Server is failing to detect and configure disks that you

know to be physically present, you may be encountering a

known problem in the Linux operating system.

To work around the problem, adjust the max_lun parameter in

the /etc/opt/polyserve/conf/scl.conf file. Locate the following lines

in the file, and set the parameter to the highest LUN number.

# max_lun

# In the event that the storage doesn't properly report its

# visible LUNs, AND if the LUNs are not numbered contiguously,

# this parameter can be modified to force SCL to probe for

# non-contiguous LUNs. The value should be set to the highest

# visible LUN id.

# (Normal case is this parameter should not be needed, even if LUNs

# are non-contiguous, because most storage can correctly report

# its LUNs, in which case SCL will use that data).

#max_lun 16 # modify this value to the actual highest LUN

Defect

Description