• Penchala Narasimha Reddy Chilakala, ERS-HCLTech's avatar
    [SCSI] aacraid: fix File System going into read-only mode · cacb6dc3
    These particular problems were reported by Cisco and SAP and customers
    as well. Cisco reported on RHEL4 U6 and SAP reported on SLES9 SP4 and
    SLES10 SP2. We added these fixes on RHEL4 U6 and gave a private build
    to IBM and Cisco. Cisco and IBM tested it for more than 15 days and
    they reported that they did not see the issue so far. Before the fix,
    Cisco used to see the issue within 5 days. We generated a patch for
    SLES9 SP4 and SLES10 SP2 and submitted to Novell. Novell applied the
    patch and gave a test build to SAP. SAP tested and reported that the
    build is working properly.
    
    We also tested in our lab using the tools "dishogsync", which is IO
    stress tool and the tool was provided by Cisco.
    
    Issue1:  File System going into read-only mode
    
    Root cause: The driver tends to not free the memory (FIB) when the
    management request exits prematurely. The accumulation of such
    un-freed memory causes the driver to fail to allocate anymore memory
    (FIB) and hence return 0x70000 value to the upper layer, which puts
    the file system into read only mode.
    
    Fix details: The fix makes sure to free the memory (FIB) even if the
    request exits prematurely hence ensuring the driver wouldn't run out
    of memory (FIBs).
    
    
    Issue2: False Raid Alert occurs
    
    When the Physical Drives and Logical drives are reported as deleted or
    added, even though there is no change done on the system
    
    Root cause: Driver IOCTLs is signaled with EINTR while waiting on
    response from the lower layers. Returning "EINTR" will never initiate
    internal retry.
    
    Fix details: The issue was fixed by replacing "EINTR" with
    "ERESTARTSYS" for mid-layer retries.
    Signed-off-by: default avatarPenchala Narasimha Reddy <ServeRAIDDriver@hcl.in>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
    cacb6dc3
dpcsup.c 9.96 KB