Re: [PATCH] MVSAS: hot plug handling and IO issues

[Konstantinos Skarlatos <k.skarlatos@gmail.com>]

On 14/3/2010 1:54 μμ, Konstantinos Skarlatos wrote:
> I have installed an AOC-SASLP-MV8 on my system (arch linux amd64 
> 2.6.33 with latest mvsas patch from Srinivas). I do not have any 
> mdraid config, every drive has its own filesystem. Everything works 
> fine, unless i try to boot with 8 disks. Then booting stalls during 
> the mount disk phase and eventually i get an "unable to read 
> superblock" message(curiously fscking all the disks seems to work just 
> before that). When that happens, the blue activity light for the first 
> drive is constantly on. This also happened with the stock 2.6.33 kernel.
>
> With 7 or less disks everything works ok, except for this warning that 
> does not seem to interfere with the operation of the card.
>
> ------------[ cut here ]------------
> WARNING: at drivers/ata/libata-core.c:5186 ata_qc_issue+0x31f/0x330 
> [libata]()
> Hardware name:
> Modules linked in: ipv6 hwmon_vid xfs exportfs jfs cpufreq_powersave 
> cpufreq_ondemand fan powernow_k8 freq_table firewire_ohci psmouse 
> firewire_core edac_core thermal i2c_nforce2 crc_itu_t serio_raw k8temp 
> skge edac_mce_amd button evdev processor pcspkr fuse forcedeth sg 
> i2c_core rtc_cmos rtc_core rtc_lib ext4 mbcache jbd2 crc16 dm_crypt 
> dm_mod ohci_hcd sd_mod usb_storage ehci_hcd mvsas libsas sata_sil 
> scsi_transport_sas pata_amd sata_nv usbcore sata_via ata_generic 
> pata_via pata_acpi libata scsi_mod
> Pid: 2920, comm: hddtemp Not tainted 2.6.33-ARCH #1
> Call Trace:
>  [<ffffffff810528e8>] warn_slowpath_common+0x78/0xb0
>  [<ffffffff8105292f>] warn_slowpath_null+0xf/0x20
>  [<ffffffffa002c14f>] ata_qc_issue+0x31f/0x330 [libata]
>  [<ffffffffa0006fae>] ? scsi_init_sgtable+0x4e/0x90 [scsi_mod]
>  [<ffffffffa0033cd0>] ? ata_scsi_pass_thru+0x0/0x2f0 [libata]
>  [<ffffffffa00310c6>] ata_scsi_translate+0xa6/0x180 [libata]
>  [<ffffffffa0000b10>] ? scsi_done+0x0/0x20 [scsi_mod]
>  [<ffffffffa0000b10>] ? scsi_done+0x0/0x20 [scsi_mod]
>  [<ffffffffa0034369>] ata_sas_queuecmd+0x139/0x2b0 [libata]
>  [<ffffffffa00e4098>] sas_queuecommand+0x98/0x300 [libsas]
>  [<ffffffffa0000c25>] scsi_dispatch_cmd+0xf5/0x230 [scsi_mod]
>  [<ffffffffa0006ba2>] scsi_request_fn+0x322/0x3e0 [scsi_mod]
>  [<ffffffff81061937>] ? lock_timer_base+0x37/0x70
>  [<ffffffff811b6d0c>] __blk_run_queue+0x5c/0x150
>  [<ffffffff811b0760>] elv_insert+0x140/0x230
>  [<ffffffff811b08ba>] __elv_add_request+0x6a/0xc0
>  [<ffffffff811bc960>] blk_execute_rq_nowait+0x60/0xb0
>  [<ffffffff811bca31>] blk_execute_rq+0x81/0xf0
>  [<ffffffff811bc7e8>] ? blk_rq_map_user+0x198/0x270
>  [<ffffffff811c0b3b>] sg_io+0x28b/0x3d0
>  [<ffffffff811c14c0>] scsi_cmd_ioctl+0x4d0/0x530
>  [<ffffffff8115146b>] ? blkdev_get+0xb/0x10
>  [<ffffffff811514dc>] ? blkdev_open+0x6c/0xc0
>  [<ffffffffa00023cd>] ? scsi_ioctl+0x27d/0x390 [scsi_mod]
>  [<ffffffffa0128cff>] sd_ioctl+0x8f/0xe0 [sd_mod]
>  [<ffffffff811be0cf>] __blkdev_driver_ioctl+0x8f/0xb0
>  [<ffffffff811be59e>] blkdev_ioctl+0x22e/0x820
>  [<ffffffff8114fca7>] block_ioctl+0x37/0x40
>  [<ffffffff81131978>] vfs_ioctl+0x38/0xd0
>  [<ffffffff81131b20>] do_vfs_ioctl+0x80/0x560
>  [<ffffffff81132081>] sys_ioctl+0x81/0xa0
>  [<ffffffff8100a002>] system_call_fastpath+0x16/0x1b
> ---[ end trace 881aaf5eceedc267 ]---
>
> SMART works ok, except for a WD drive that needs a -T permissive to work
> (the other WD drive on the controller, a WDC WD15EADS-00P8B0, works 
> without the -T permissive switch)
A small correction here, the WD15EADS-00P8B0 drive is not on the 
controller but on a motherboard slot, so that explains why smartctl 
works without -T permissive. The other 6 drives on the SASLP are Seagate 
ST31500541AS and smartctl works without -T permissive for them.
>
> root ~  #  smartctl -a -d ata /dev/sdk
> smartctl 5.39.1 2010-01-28 r3054 [x86_64-unknown-linux-gnu] (local build)
> Copyright (C) 2002-10 by Bruce Allen, 
> http://smartmontools.sourceforge.net
>
> === START OF INFORMATION SECTION ===
> Model Family:     Western Digital Caviar Green family
> Device Model:     WDC WD15EADS-00S2B0
> Serial Number:    WD-WCAVY1089106
> Firmware Version: 01.00A01
> User Capacity:    1,500,301,910,016 bytes
> Device is:        In smartctl database [for details use: -P show]
> ATA Version is:   8
> ATA Standard is:  Exact ATA specification draft version not indicated
> Local Time is:    Sun Mar 14 13:39:47 2010 EET
> SMART support is: Available - device has SMART capability.
> SMART support is: Enabled
>
> Error SMART Status command failed
> Please get assistance from http://smartmontools.sourceforge.net/
> Register values returned from SMART Status command are:
> ST =0x40
> ERR=0x00
> NS =0x14
> SC =0xa7
> CL =0x1f
> CH =0xf8
> SEL=0x40
> A mandatory SMART command failed: exiting. To continue, add one or 
> more '-T permissive' options.
>
> I am now stressing the card, reading and writing data at the same time 
> from every single disk on my system and everything seems to work ok 
> (fingers crossed). The real test for me will be when I install an HP 
> SAS expander that i am waiting for any day now.

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