From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Message-ID: <1519930884.9730.8.camel@redhat.com> Subject: Re: [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue From: Laurence Oberman To: Don Brace , Ming Lei , Jens Axboe , "linux-block@vger.kernel.org" , Christoph Hellwig , Mike Snitzer Cc: "linux-scsi@vger.kernel.org" , Hannes Reinecke , Arun Easi , Omar Sandoval , "Martin K . Petersen" , James Bottomley , Christoph Hellwig , Kashyap Desai , Peter Rivera , Meelis Roos Date: Thu, 01 Mar 2018 14:01:24 -0500 In-Reply-To: <633459ac33bf49c9a3ff6e515aa790de@microsemi.com> References: <20180227100750.32299-1-ming.lei@redhat.com> <20180227100750.32299-2-ming.lei@redhat.com> <633459ac33bf49c9a3ff6e515aa790de@microsemi.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 List-ID: On Thu, 2018-03-01 at 16:18 +0000, Don Brace wrote: > > -----Original Message----- > > From: Ming Lei [mailto:ming.lei@redhat.com] > > Sent: Tuesday, February 27, 2018 4:08 AM > > To: Jens Axboe ; linux-block@vger.kernel.org; > > Christoph > > Hellwig ; Mike Snitzer > > Cc: linux-scsi@vger.kernel.org; Hannes Reinecke ; > > Arun Easi > > ; Omar Sandoval ; Martin K . > > Petersen ; James Bottomley > > ; Christoph Hellwig > .de>; > > Don Brace ; Kashyap Desai > > ; Peter Rivera > om>; > > Laurence Oberman ; Ming Lei > > ; Meelis Roos > > Subject: [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue > > > > EXTERNAL EMAIL > > > > > > From 84676c1f21 (genirq/affinity: assign vectors to all possible > > CPUs), > > one msix vector can be created without any online CPU mapped, then > > one > > command's completion may not be notified. > > > > This patch setups mapping between cpu and reply queue according to > > irq > > affinity info retrived by pci_irq_get_affinity(), and uses this > > mapping > > table to choose reply queue for queuing one command. > > > > Then the chosen reply queue has to be active, and fixes IO hang > > caused > > by using inactive reply queue which doesn't have any online CPU > > mapped. > > > > Cc: Hannes Reinecke > > Cc: Arun Easi > > Cc: "Martin K. Petersen" , > > Cc: James Bottomley , > > Cc: Christoph Hellwig , > > Cc: Don Brace > > Cc: Kashyap Desai > > Cc: Peter Rivera > > Cc: Laurence Oberman > > Cc: Meelis Roos > > Fixes: 84676c1f21e8 ("genirq/affinity: assign vectors to all > > possible CPUs") > > Signed-off-by: Ming Lei > > I am getting some issues that need to be tracked down: > > [ 1636.032984] hpsa 0000:87:00.0: Acknowledging event: 0xc0000032 (HP > SSD Smart Path configuration change) > [ 1638.510656] hpsa 0000:87:00.0: scsi 3:0:8:0: updated Direct- > Access     HP       MO0400JDVEU      PHYS DRV SSDSmartPathCap- En- > Exp=0 > [ 1653.967695] hpsa 0000:87:00.0: Acknowledging event: 0x80000020 (HP > SSD Smart Path configuration change) > [ 1656.770377] hpsa 0000:87:00.0: scsi 3:0:8:0: updated Direct- > Access     HP       MO0400JDVEU      PHYS DRV SSDSmartPathCap- En- > Exp=0 > [ 2839.762267] hpsa 0000:87:00.0: Acknowledging event: 0x80000020 (HP > SSD Smart Path configuration change) > [ 2840.841290] hpsa 0000:87:00.0: scsi 3:0:8:0: updated Direct- > Access     HP       MO0400JDVEU      PHYS DRV SSDSmartPathCap- En- > Exp=0 > [ 2917.582653] hpsa 0000:87:00.0: Acknowledging event: 0xc0000020 (HP > SSD Smart Path configuration change) > [ 2919.087191] hpsa 0000:87:00.0: scsi 3:1:0:1: updated Direct- > Access     HP       LOGICAL VOLUME   RAID-5 SSDSmartPathCap+ En+ > Exp=1 > [ 2919.142527] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 2919.203915] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 2919.266921] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 2934.999629] hpsa 0000:87:00.0: Acknowledging event: 0x40000000 (HP > SSD Smart Path state change) > [ 2936.937333] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 2936.998707] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 2937.060101] hpsa 0000:87:00.0: hpsa_figure_phys_disk_ptrs: > [3:1:0:2] A phys disk component of LV is missing, turning off > offload_enabled for LV. > [ 3619.711122] sd 3:1:0:3: [sde] tag#436 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3619.751150] sd 3:1:0:3: [sde] tag#436 Sense Key : Aborted Command > [current]  > [ 3619.784375] sd 3:1:0:3: [sde] tag#436 Add. Sense: Internal target > failure > [ 3619.816530] sd 3:1:0:3: [sde] tag#436 CDB: Read(10) 28 00 01 1b ad > af 00 00 01 00 > [ 3619.852295] print_req_error: I/O error, dev sde, sector 18591151 > [ 3619.880850] sd 3:1:0:3: [sde] tag#461 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3619.920981] sd 3:1:0:3: [sde] tag#461 Sense Key : Aborted Command > [current]  > [ 3619.955081] sd 3:1:0:3: [sde] tag#461 Add. Sense: Internal target > failure > [ 3619.987054] sd 3:1:0:3: [sde] tag#461 CDB: Read(10) 28 00 02 15 31 > 40 00 00 01 00 > [ 3620.022569] print_req_error: I/O error, dev sde, sector 34943296 > [ 3620.050873] sd 3:1:0:3: [sde] tag#157 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.091124] sd 3:1:0:3: [sde] tag#157 Sense Key : Aborted Command > [current]  > [ 3620.124179] sd 3:1:0:3: [sde] tag#157 Add. Sense: Internal target > failure > [ 3620.156203] sd 3:1:0:3: [sde] tag#157 CDB: Read(10) 28 00 03 65 9d > 7e 00 00 01 00 > [ 3620.191520] print_req_error: I/O error, dev sde, sector 56991102 > [ 3620.220308] sd 3:1:0:3: [sde] tag#266 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.260273] sd 3:1:0:3: [sde] tag#266 Sense Key : Aborted Command > [current]  > [ 3620.294605] sd 3:1:0:3: [sde] tag#266 Add. Sense: Internal target > failure > [ 3620.328353] sd 3:1:0:3: [sde] tag#266 CDB: Read(10) 28 00 09 92 94 > 70 00 00 01 00 > [ 3620.364807] print_req_error: I/O error, dev sde, sector 160601200 > [ 3620.394342] sd 3:1:0:3: [sde] tag#278 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.434462] sd 3:1:0:3: [sde] tag#278 Sense Key : Aborted Command > [current]  > [ 3620.469059] sd 3:1:0:3: [sde] tag#278 Add. Sense: Internal target > failure > [ 3620.471761] sd 3:1:0:3: [sde] tag#467 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.502240] sd 3:1:0:3: [sde] tag#278 CDB: Read(10) 28 00 08 00 12 > ea 00 00 01 00 > [ 3620.543157] sd 3:1:0:3: [sde] tag#467 Sense Key : Aborted Command > [current]  > [ 3620.580375] print_req_error: I/O error, dev sde, sector 134222570 > [ 3620.615355] sd 3:1:0:3: [sde] tag#467 Add. Sense: Internal target > failure > [ 3620.645069] sd 3:1:0:3: [sde] tag#244 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.678696] sd 3:1:0:3: [sde] tag#467 CDB: Read(10) 28 00 10 3f 2b > fc 00 00 01 00 > [ 3620.720247] sd 3:1:0:3: [sde] tag#244 Sense Key : Aborted Command > [current]  > [ 3620.756776] print_req_error: I/O error, dev sde, sector 272575484 > [ 3620.791857] sd 3:1:0:3: [sde] tag#244 Add. Sense: Internal target > failure > [ 3620.822272] sd 3:1:0:3: [sde] tag#431 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3620.855200] sd 3:1:0:3: [sde] tag#244 CDB: Read(10) 28 00 08 31 86 > d9 00 00 01 00 > [ 3620.895823] sd 3:1:0:3: [sde] tag#431 Sense Key : Aborted Command > [current]  > [ 3620.931923] print_req_error: I/O error, dev sde, sector 137463513 > [ 3620.966262] sd 3:1:0:3: [sde] tag#431 Add. Sense: Internal target > failure > [ 3620.995715] sd 3:1:0:3: [sde] tag#226 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3621.028703] sd 3:1:0:3: [sde] tag#431 CDB: Read(10) 28 00 10 7c b2 > b0 00 00 01 00 > [ 3621.069686] sd 3:1:0:3: [sde] tag#226 Sense Key : Aborted Command > [current]  > [ 3621.106253] print_req_error: I/O error, dev sde, sector 276607664 > [ 3621.140782] sd 3:1:0:3: [sde] tag#226 Add. Sense: Internal target > failure > [ 3621.170241] sd 3:1:0:3: [sde] tag#408 FAILED Result: > hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 3621.202997] sd 3:1:0:3: [sde] tag#226 CDB: Read(10) 28 00 08 ba cf > f2 00 00 01 00 > [ 3621.243870] sd 3:1:0:3: [sde] tag#408 Sense Key : Aborted Command > [current]  > [ 3621.280015] print_req_error: I/O error, dev sde, sector 146460658 > [ 3621.313941] sd 3:1:0:3: [sde] tag#408 Add. Sense: Internal target > failure > [ 3621.343790] print_req_error: I/O error, dev sde, sector 98830586 > [ 3621.376164] sd 3:1:0:3: [sde] tag#408 CDB: Read(10) 28 00 14 da 6a > 53 00 00 01 00 > [ 3641.714842] WARNING: CPU: 3 PID: 0 at kernel/rcu/tree.c:2713 > rcu_process_callbacks+0x4d5/0x510 > [ 3641.756175] Modules linked in: sg ip6t_rpfilter ip6t_REJECT > nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT > nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack > nf_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge stp > llc ebtable_filter ebtables ip6table_mangle ip6table_security > ip6table_raw ip6table_filter ip6_tables iptable_mangle > iptable_security iptable_raw iptable_filter ip_tables sb_edac > x86_pkg_temp_thermal coretemp kvm_intel kvm irqbypass > crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc iTCO_wdt > iTCO_vendor_support aesni_intel crypto_simd glue_helper cryptd pcspkr > hpilo hpwdt ioatdma shpchp ipmi_si lpc_ich dca mfd_core wmi > ipmi_msghandler acpi_power_meter pcc_cpufreq uinput xfs libcrc32c > mgag200 i2c_algo_bit drm_kms_helper sd_mod syscopyarea sysfillrect > [ 3642.094993]  sysimgblt fb_sys_fops ttm drm crc32c_intel i2c_core > tg3 hpsa scsi_transport_sas usb_storage dm_mirror dm_region_hash > dm_log dm_mod dax > [ 3642.158883] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.16.0-rc3+ > #18 > [ 3642.190015] Hardware name: HP ProLiant DL580 Gen8, BIOS P79 > 08/18/2016 > [ 3642.221949] RIP: 0010:rcu_process_callbacks+0x4d5/0x510 > [ 3642.247606] RSP: 0018:ffff8e179f6c3f08 EFLAGS: 00010002 > [ 3642.273087] RAX: 0000000000000000 RBX: ffff8e179f6e3180 RCX: > ffff8e279d1e8918 > [ 3642.307426] RDX: ffffffffffffd801 RSI: ffff8e179f6c3f18 RDI: > ffff8e179f6e31b8 > [ 3642.342219] RBP: ffffffffb70a31c0 R08: ffff8e279d1e8918 R09: > 0000000000000100 > [ 3642.376929] R10: 0000000000000004 R11: 0000000000000005 R12: > ffff8e179f6e31b8 > [ 3642.411598] R13: ffff8e179d20ad00 R14: 0000000000000001 R15: > 7fffffffffffffff > [ 3642.445957] FS:  0000000000000000(0000) GS:ffff8e179f6c0000(0000) > knlGS:0000000000000000 > [ 3642.485599] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 3642.513678] CR2: 00007f30917b9008 CR3: 000000054900a006 CR4: > 00000000001606e0 > [ 3642.548189] Call Trace: > [ 3642.560411]   > [ 3642.570588]  __do_softirq+0xd1/0x275 > [ 3642.588643]  irq_exit+0xd5/0xe0 > [ 3642.604134]  smp_apic_timer_interrupt+0x60/0x120 > [ 3642.626752]  apic_timer_interrupt+0xf/0x20 > [ 3642.646712]   > [ 3642.657330] RIP: 0010:cpuidle_enter_state+0xd4/0x260 > [ 3642.681389] RSP: 0018:ffffaed7c00e7ea0 EFLAGS: 00000246 ORIG_RAX: > ffffffffffffff12 > [ 3642.717937] RAX: ffff8e179f6e2280 RBX: ffffcebfbfec1bb8 RCX: > 000000000000001f > [ 3642.752525] RDX: 0000000000000000 RSI: ff6c3b1b90a53a78 RDI: > 0000000000000000 > [ 3642.787181] RBP: 0000000000000003 R08: 0000000000000005 R09: > 0000000000000396 > [ 3642.821442] R10: 00000000000003a7 R11: 0000000000000008 R12: > 0000000000000003 > [ 3642.856381] R13: 0000034fe70ea52c R14: 0000000000000003 R15: > 0000034fe71d99d4 > [ 3642.890830]  do_idle+0x172/0x1e0 > [ 3642.906714]  cpu_startup_entry+0x6f/0x80 > [ 3642.925835]  start_secondary+0x187/0x1e0 > [ 3642.944975]  secondary_startup_64+0xa5/0xb0 > [ 3642.965719] Code: e9 db fd ff ff 4c 89 f6 4c 89 e7 e8 96 b8 63 00 > e9 56 fc ff ff 0f 0b e9 34 fc ff ff 0f 0b 0f 1f 84 00 00 00 00 00 e9 > e0 fb ff ff <0f> 0b 66 0f 1f 84 00 00 00 00 00 e9 e5 fd ff ff 0f 0b > 66 0f 1f  > [ 3643.056198] ---[ end trace 7bdac969b3138de7 ]--- > [ 3735.745955] hpsa 0000:87:00.0: SCSI status: LUN:000000c000002601 > CDB:12010000040000000000000000000000 > [ 3735.790497] hpsa 0000:87:00.0: SCSI Status = 02, Sense key = 0x05, > ASC = 0x25, ASCQ = 0x00 > > --- > >  drivers/scsi/hpsa.c | 73 +++++++++++++++++++++++++++++++++++++++ > > -------------- > >  drivers/scsi/hpsa.h |  1 + > >  2 files changed, 55 insertions(+), 19 deletions(-) > > > > diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c > > index 5293e6827ce5..3a9eca163db8 100644 > > --- a/drivers/scsi/hpsa.c > > +++ b/drivers/scsi/hpsa.c > > @@ -1045,11 +1045,7 @@ static void set_performant_mode(struct > > ctlr_info > > *h, struct CommandList *c, > >                 c->busaddr |= 1 | (h->blockFetchTable[c- > > >Header.SGList] << 1); > >                 if (unlikely(!h->msix_vectors)) > >                         return; > > -               if (likely(reply_queue == DEFAULT_REPLY_QUEUE)) > > -                       c->Header.ReplyQueue = > > -                               raw_smp_processor_id() % h- > > >nreply_queues; > > -               else > > -                       c->Header.ReplyQueue = reply_queue % h- > > >nreply_queues; > > +               c->Header.ReplyQueue = reply_queue; > >         } > >  } > > > > @@ -1063,10 +1059,7 @@ static void > > set_ioaccel1_performant_mode(struct > > ctlr_info *h, > >          * Tell the controller to post the reply to the queue for > > this > >          * processor.  This seems to give the best I/O throughput. > >          */ > > -       if (likely(reply_queue == DEFAULT_REPLY_QUEUE)) > > -               cp->ReplyQueue = smp_processor_id() % h- > > >nreply_queues; > > -       else > > -               cp->ReplyQueue = reply_queue % h->nreply_queues; > > +       cp->ReplyQueue = reply_queue; > >         /* > >          * Set the bits in the address sent down to include: > >          *  - performant mode bit (bit 0) > > @@ -1087,10 +1080,7 @@ static void > > set_ioaccel2_tmf_performant_mode(struct ctlr_info *h, > >         /* Tell the controller to post the reply to the queue for > > this > >          * processor.  This seems to give the best I/O throughput. > >          */ > > -       if (likely(reply_queue == DEFAULT_REPLY_QUEUE)) > > -               cp->reply_queue = smp_processor_id() % h- > > >nreply_queues; > > -       else > > -               cp->reply_queue = reply_queue % h->nreply_queues; > > +       cp->reply_queue = reply_queue; > >         /* Set the bits in the address sent down to include: > >          *  - performant mode bit not used in ioaccel mode 2 > >          *  - pull count (bits 0-3) > > @@ -1109,10 +1099,7 @@ static void > > set_ioaccel2_performant_mode(struct > > ctlr_info *h, > >          * Tell the controller to post the reply to the queue for > > this > >          * processor.  This seems to give the best I/O throughput. > >          */ > > -       if (likely(reply_queue == DEFAULT_REPLY_QUEUE)) > > -               cp->reply_queue = smp_processor_id() % h- > > >nreply_queues; > > -       else > > -               cp->reply_queue = reply_queue % h->nreply_queues; > > +       cp->reply_queue = reply_queue; > >         /* > >          * Set the bits in the address sent down to include: > >          *  - performant mode bit not used in ioaccel mode 2 > > @@ -1157,6 +1144,8 @@ static void __enqueue_cmd_and_start_io(struct > > ctlr_info *h, > >  { > >         dial_down_lockup_detection_during_fw_flash(h, c); > >         atomic_inc(&h->commands_outstanding); > > + > > +       reply_queue = h->reply_map[raw_smp_processor_id()]; > >         switch (c->cmd_type) { > >         case CMD_IOACCEL1: > >                 set_ioaccel1_performant_mode(h, c, reply_queue); > > @@ -7376,6 +7365,26 @@ static void > > hpsa_disable_interrupt_mode(struct > > ctlr_info *h) > >         h->msix_vectors = 0; > >  } > > > > +static void hpsa_setup_reply_map(struct ctlr_info *h) > > +{ > > +       const struct cpumask *mask; > > +       unsigned int queue, cpu; > > + > > +       for (queue = 0; queue < h->msix_vectors; queue++) { > > +               mask = pci_irq_get_affinity(h->pdev, queue); > > +               if (!mask) > > +                       goto fallback; > > + > > +               for_each_cpu(cpu, mask) > > +                       h->reply_map[cpu] = queue; > > +       } > > +       return; > > + > > +fallback: > > +       for_each_possible_cpu(cpu) > > +               h->reply_map[cpu] = 0; > > +} > > + > >  /* If MSI/MSI-X is supported by the kernel we will try to enable > > it on > >   * controllers that are capable. If not, we use legacy INTx mode. > >   */ > > @@ -7771,6 +7780,10 @@ static int hpsa_pci_init(struct ctlr_info > > *h) > >         err = hpsa_interrupt_mode(h); > >         if (err) > >                 goto clean1; > > + > > +       /* setup mapping between CPU and reply queue */ > > +       hpsa_setup_reply_map(h); > > + > >         err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr); > >         if (err) > >                 goto clean2;    /* intmode+region, pci */ > > @@ -8480,6 +8493,28 @@ static struct workqueue_struct > > *hpsa_create_controller_wq(struct ctlr_info *h, > >         return wq; > >  } > > > > +static void hpda_free_ctlr_info(struct ctlr_info *h) > > +{ > > +       kfree(h->reply_map); > > +       kfree(h); > > +} > > + > > +static struct ctlr_info *hpda_alloc_ctlr_info(void) > > +{ > > +       struct ctlr_info *h; > > + > > +       h = kzalloc(sizeof(*h), GFP_KERNEL); > > +       if (!h) > > +               return NULL; > > + > > +       h->reply_map = kzalloc(sizeof(*h->reply_map) * nr_cpu_ids, > > GFP_KERNEL); > > +       if (!h->reply_map) { > > +               kfree(h); > > +               return NULL; > > +       } > > +       return h; > > +} > > + > >  static int hpsa_init_one(struct pci_dev *pdev, const struct > > pci_device_id *ent) > >  { > >         int dac, rc; > > @@ -8517,7 +8552,7 @@ static int hpsa_init_one(struct pci_dev > > *pdev, const > > struct pci_device_id *ent) > >          * the driver.  See comments in hpsa.h for more info. > >          */ > >         BUILD_BUG_ON(sizeof(struct CommandList) % > > COMMANDLIST_ALIGNMENT); > > -       h = kzalloc(sizeof(*h), GFP_KERNEL); > > +       h = hpda_alloc_ctlr_info(); > >         if (!h) { > >                 dev_err(&pdev->dev, "Failed to allocate controller > > head\n"); > >                 return -ENOMEM; > > @@ -8916,7 +8951,7 @@ static void hpsa_remove_one(struct pci_dev > > *pdev) > >         h->lockup_detected = NULL;                      /* init_one > > 2 */ > >         /* (void) pci_disable_pcie_error_reporting(pdev); */    /* > > init_one 1 */ > > > > -       kfree(h);                                       /* init_one > > 1 */ > > +       hpda_free_ctlr_info(h);                         /* init_one > > 1 */ > >  } > > > >  static int hpsa_suspend(__attribute__((unused)) struct pci_dev > > *pdev, > > diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h > > index 018f980a701c..fb9f5e7f8209 100644 > > --- a/drivers/scsi/hpsa.h > > +++ b/drivers/scsi/hpsa.h > > @@ -158,6 +158,7 @@ struct bmic_controller_parameters { > >  #pragma pack() > > > >  struct ctlr_info { > > +       unsigned int *reply_map; > >         int     ctlr; > >         char    devname[8]; > >         char    *product_name; > > -- > > 2.9.5 > > I have a DL580 here with the following: Ming's latest tree 4.16.0-rc2.ming+ 3:00.0 RAID bus controller: Hewlett-Packard Company Smart Array G6 controllers (rev 01) P410i /dev/sg0  1 0 0 0  12  HP        P410i             6.60 /dev/sg1  1 1 0 0  0  /dev/sda  HP        LOGICAL VOLUME    6.60 Boot volume /dev/sg2  1 1 0 1  0  /dev/sdb  HP        LOGICAL VOLUME    6.60 Single disk /dev/sg3  1 1 0 2  0  /dev/sdc  HP        LOGICAL VOLUME    6.60   2 Disk Mirror MSA50 Shelf at 6GB, all Jbods 0e:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2208 [Thunderbolt] (rev 03) /dev/sg4  0 0 43 0  0  /dev/sdd  HP        DG072A9BB7        HPD0 /dev/sg5  0 0 44 0  0  /dev/sde  HP        DG146BABCF        HPD5 /dev/sg6  0 0 45 0  0  /dev/sdf  HP        DG146BABCF        HPD6 /dev/sg7  0 0 46 0  0  /dev/sdg  HP        EG0146FAWHU       HPDE /dev/sg8  0 0 47 0  0  /dev/sdh  HP        EG0146FAWHU       HPDD /dev/sg9  0 0 48 0  0  /dev/sdi  HP        EG0146FAWHU       HPDE /dev/sg10  0 0 49 0  0  /dev/sdj  ATA       OCZ-VERTEX4       1.5  /dev/sg11  0 0 50 0  0  /dev/sdk  ATA       OCZ-VERTEX4       1.5  /dev/sg12  0 0 51 0  0  /dev/sdl  ATA       INTEL SSDSC2BW08  DC32 /dev/sg13  0 0 52 0  13  HP        MSA50  -10D25G1   1.20 I have multiple boot passes on the HPSA all passing, and have not had any access issues with Ming's patches to the megaraid_sas drives I dont have the decent SSD hardware to test performance on the megaraid_sas to match Kashyap unfortunately. What I can say is that so far all boot testing has passed. I will exercise all the drives now to see if I can bring about any issues seen by Don Thanks Laurence