AlphaServer SC V2.5 UK1 patch kit 3948

22 July 2003.



This patch contains fixes for the SCFS file system issues reported in

the PTRs and/or IPMT cases listed below. This is a UK1 version of the

SSB patch SCV25SSB101019 and contains all of the fixes in that patch.



PTR         IPMT       Abstract

=======================================================================

153-2-1146  CFS.101019 SCFS assertion failed SLOCK_LOCKED(&scfs_mdb_lock)

153-2-1103  CFS.100266 scfs writes stall, large amounts of RM used  

153-2-912   CFS.96966  pfs writes hang from head node

153-2-873   CFS.96368  hang with RM usage and procs in vm_wait

=======================================================================



You will need to build and deploy new kernels and reboot all nodes

to install this patch. This patch cannot and should not be installed

on the management station (if any).





Summary of fixes:

=================



1. Changed an incorrect variable definition in scfs_backround_sync_thread

   that was causing the top 32 bits of transaction ids greater than

   INT_MAX (0x7fffffff) to be lost. The corresponding shadow copies would

   never be freed, leading the node to run out of shadow space and stall

   on FAST mode writes.



2. An assertion in scfscli_release_replayspace was causing panics after

   orderly failovers unless the old server stayed up. Found a missing

   lock/unlock pair in the code that calls this function and fixed it.



3. Changed the code the receives server notifications so that it does

   not discard notifications that arrive while the shadow copy is still

   being made. Previously this situation lead to leaking shadow copies.

   Also added extra counters to monitor shadow copy lifecycles. These

   new counters ultimately allowed us to find and fix problem 1 above.





Prerequisites:

==============



This is a UK1 patch and will not work correctly on a V2.5 SSB system.





Kit location:

=============



The patch kit is SCV25UK13948 and is available from 

ITRC





Kit checksum:

=============



    # cksum SCV25UK13948.tar.gz

    671559944 367697 SCV25UK13948.tar.gz





Updated files:

==============



A list of the files included in this patch is given below along with

the cksum values for each file.



    394203747 603500 /usr/opt/SCFS/sys/scfs_client.mod



Instructions:

=============



SCV25UK13948 is provided as a setld installable kit. Unpack it

into a directory that is NFS mounted on all domains e.g.

/usr/kits/SCV25UK13948 and install it as follows.



    # cd /usr/kits/SCV25UK13948

    # scrun -d all setld -l /usr/kits/SCV25UK13948 SCV25UK13948



Now build and deploy kernels and reboot all nodes.



    # scrun -d all BuildKernels

    # scrun -d all DeployKernels



    # sra shutdown -nodes all

    # sra boot -nodes all



Installation is complete at this point.



=======================================================================



To remove SCV25UK13948 use the following commands:



    # scrun -d all setld -d SCV25UK13948

    # scrun -d all BuildKernels

    # scrun -d all DeployKernels



    # sra shutdown -nodes all

    # sra boot -nodes all





=======================================================================

SCV25UK13948

Sierra Engineering, 22 July 2003.