It's very strange for me that it is not runtime configurable... OK, thnx.
Also I'm not very close to ata protocols, so :
1. Why there is need to reset link if sector can not be read?
2. Why device is locked until hard reset?
Aug 13 08:45:45 ubuntu kernel: [ 5634.080692] sd 4:0:0:0: [sde]
1465149168 512-byte hardware sectors (750156 MB)
Aug 13 08:45:46 ubuntu kernel: [ 5635.088067] res
40/00:08:e0:a7:36/01:00:01:00:00/00 Emask 0x4 (timeout)
Aug 13 08:45:46 ubuntu kernel: [ 5635.088136] ata5: hard resetting link
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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