As it named RETRY, I set it to 0, "define SD_MAX_RETRIES 0"
But still got two retries. Any suggestions?
dd if=/dev/sda of=/dev/null bs=512 skip=20359137 count=1
Aug 13 15:50:02 ubuntu kernel: [ 244.688030] res
51/40:08:e0:a7:36/01:00:01:00:00/00 Emask 0x409 (media error) <F>
Aug 13 15:50:02 ubuntu kernel: [ 244.688206] ata5: hard resetting link
Aug 13 15:50:02 ubuntu kernel: [ 245.226248] ata5: SATA link up 3.0
Gbps (SStatus 123 SControl 300)
Aug 13 15:50:02 ubuntu kernel: [ 245.306267] ata5.00: max_sectors
limited to 256 for NCQ
Aug 13 15:50:02 ubuntu kernel: [ 245.388635] ata5.00: max_sectors
limited to 256 for NCQ
Aug 13 15:50:02 ubuntu kernel: [ 245.388637] ata5.00: configured for
UDMA/133
Aug 13 15:50:02 ubuntu kernel: [ 245.388643] sd 4:0:0:0: [sda] Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Aug 13 15:50:02 ubuntu kernel: [ 245.388646] sd 4:0:0:0: [sda] Sense
Key : Medium Error [current] [descriptor]
Aug 13 15:50:02 ubuntu kernel: [ 245.388649] Descriptor sense data with
sense descriptors (in hex):
Aug 13 15:50:02 ubuntu kernel: [ 245.388651] 72 03 11 04 00 00
00 0c 00 0a 80 00 00 00 00 00
Aug 13 15:50:02 ubuntu kernel: [ 245.388658] 01 36 a7 e0
Aug 13 15:50:02 ubuntu kernel: [ 245.388661] sd 4:0:0:0: [sda] Add.
Sense: Unrecovered read error - auto reallocate failed
Aug 13 15:50:02 ubuntu kernel: [ 245.388783] ata5: EH complete
Aug 13 15:50:02 ubuntu kernel: [ 245.388722] sd 4:0:0:0: [sda]
1465149168 512-byte hardware sectors (750156 MB)
Aug 13 15:50:02 ubuntu kernel: [ 245.388722] sd 4:0:0:0: [sda] Write
Protect is off
Aug 13 15:50:02 ubuntu kernel: [ 245.388722] sd 4:0:0:0: [sda] Write
cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 13 15:50:04 ubuntu kernel: [ 247.117648] res
51/40:08:e0:a7:36/01:00:01:00:00/00 Emask 0x409 (media error) <F>
Aug 13 15:50:04 ubuntu kernel: [ 247.117824] ata5: hard resetting link
Aug 13 15:50:04 ubuntu kernel: [ 247.659679] ata5: SATA link up 3.0
Gbps (SStatus 123 SControl 300)
Aug 13 15:50:04 ubuntu kernel: [ 247.747372] ata5.00: max_sectors
limited to 256 for NCQ
Aug 13 15:50:04 ubuntu kernel: [ 247.825139] ata5.00: max_sectors
limited to 256 for NCQ
Aug 13 15:50:04 ubuntu kernel: [ 247.825141] ata5.00: configured for
UDMA/133
Aug 13 15:50:04 ubuntu kernel: [ 247.825145] sd 4:0:0:0: [sda] Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Aug 13 15:50:04 ubuntu kernel: [ 247.825148] sd 4:0:0:0: [sda] Sense
Key : Medium Error [current] [descriptor]
Aug 13 15:50:04 ubuntu kernel: [ 247.825151] Descriptor sense data with
sense descriptors (in hex):
Aug 13 15:50:04 ubuntu kernel: [ 247.825153] 72 03 11 04 00 00
00 0c 00 0a 80 00 00 00 00 00
Aug 13 15:50:04 ubuntu kernel: [ 247.825160] 01 36 a7 e0
Aug 13 15:50:04 ubuntu kernel: [ 247.825163] sd 4:0:0:0: [sda] Add.
Sense: Unrecovered read error - auto reallocate failed
Aug 13 15:50:04 ubuntu kernel: [ 247.825281] ata5: EH complete
Aug 13 15:50:04 ubuntu kernel: [ 247.825223] sd 4:0:0:0: [sda]
1465149168 512-byte hardware sectors (750156 MB)
Aug 13 15:50:04 ubuntu kernel: [ 247.825223] sd 4:0:0:0: [sda] Write
Protect is off
Aug 13 15:50:04 ubuntu kernel: [ 247.825223] sd 4:0:0:0: [sda] Write
cache: enabled, read cache: enabled, doesn't support DPO or FUA
Mark Lord пишет:
Artem Bokhan wrote:
When I run 'dd if=/dev/sda of=/dev/null skip=9700 bs=1M' and it meets
bad block, it takes about
'/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:02.0/host4/target4:0:0/4:0:0:0/timeout
+ about 10 seconds' to determine I/O error. Until that IO to device
is locked, as I understand. I want to reduce the time of lock as
much as possible.
..
Tell the SCSI layer to stop flogging the drive with unnecessary retries.
A quick and dirty way, is this patch below, but it really should be more
intelligent than this for some situations:
--- linux/include/scsi/sd.h.orig 2008-06-09 14:27:19.000000000 -0400
+++ linux/include/scsi/sd.h 2008-08-13 12:16:01.000000000 -0400
@@ -23,7 +23,7 @@
/*
* Number of allowed retries
*/
-#define SD_MAX_RETRIES 5
+#define SD_MAX_RETRIES 1
#define SD_PASSTHROUGH_RETRIES 1
/*
--
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