diff options
Diffstat (limited to 'usr/src/uts/intel/io/scsi')
| -rw-r--r-- | usr/src/uts/intel/io/scsi/targets/sd.conf | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/usr/src/uts/intel/io/scsi/targets/sd.conf b/usr/src/uts/intel/io/scsi/targets/sd.conf index 1863937888..b0aebdb5b1 100644 --- a/usr/src/uts/intel/io/scsi/targets/sd.conf +++ b/usr/src/uts/intel/io/scsi/targets/sd.conf @@ -42,7 +42,7 @@ name="sd" class="scsi" target=15 lun=0; # # The following stub node is needed for pathological bottom-up -# devid resolution on a self-identifying transport. +# devid resolution on a self-identifying transport. # name="sd" class="scsi-self-identifying"; @@ -50,3 +50,34 @@ name="sd" class="scsi-self-identifying"; # Associate the driver with devid resolution. # ddi-devid-registrant=1; + +# +# Certain hardware RAID controllers have nonvolatile caches but do not +# support the SYNC_NV bit to restrict flushes to the volatile portion of +# the cache, if any. In order to get acceptable performance out of these +# devices, we need to suppress cache flushing on them. In most (hopefully +# all) cases, if the battery fails or the cache otherwise becomes volatile, +# the controller will switch to write-through mode, and ensure that any +# underlying drive cache is off. In this case, it should still be safe to +# dispense with cache flush commands. Controllers for which this is not the +# case should have cache-nonvolatile set unless data loss and corruption are +# acceptable. +# +# In addition, *all* devices have their retries capped at 1. There are an +# additional 2 retries for "victim" IOs if a reset is needed. Retrying is +# very rarely successful, and it is preferable to let ZFS do it where needed. +# +# For the Samsung client drives, users have seen data corruption when they use +# the advertised 512 byte sectors. The actual sector size of the flash +# translation layer is 4K, so it's relatively safe to make this change which +# annecdotally solves that problem. +# +sd-config-list= + "", "retries-timeout:1,retries-busy:1,retries-reset:1,retries-victim:2", + "DELL PERC H710", "cache-nonvolatile:true", + "DELL PERC H700", "cache-nonvolatile:true", + "DELL PERC/6i", "cache-nonvolatile:true", + "ATA Samsung SSD 830", "physical-block-size:4096", + "ATA Samsung SSD 840", "physical-block-size:4096", + "ATA Samsung SSD 850", "physical-block-size:4096", + "ATA Samsung SSD 860", "physical-block-size:4096"; |