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a0fde6e06e
DST uses transaction model, when each store has to be explicitly acked from the remote node to be considered as successfully written. There may be lots of in-flight transactions. When remote host does not ack the transaction it will be resent predefined number of times with specified timeouts between them. All those parameters are configurable. Transactions are marked as failed after all resends completed unsuccessfully, having long enough resend timeout and/or large number of resends allows not to return error to the higher (FS usually) layer in case of short network problems or remote node outages. In case of network RAID setup this means that storage will not degrade until transactions are marked as failed, and thus will not force checksum recalculation and data rebuild. In case of connection failure DST will try to reconnect to the remote node automatically. DST sends ping commands at idle time to detect if remote node is alive. Because of transactional model it is possible to use zero-copy sending without worry of data corruption (which in turn could be detected by the strong checksums though). Transactions are handled in this patch: allocation/freeing/completion, scanning for stall and to-be-resent transactions and overall management of the storing tree. Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
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| accessibility | ||
| acpi | ||
| amba | ||
| ata | ||
| atm | ||
| auxdisplay | ||
| base | ||
| block | ||
| bluetooth | ||
| cdrom | ||
| char | ||
| clocksource | ||
| connector | ||
| cpufreq | ||
| cpuidle | ||
| crypto | ||
| dca | ||
| dio | ||
| dma | ||
| edac | ||
| eisa | ||
| firewire | ||
| firmware | ||
| gpio | ||
| gpu | ||
| hid | ||
| hwmon | ||
| i2c | ||
| ide | ||
| idle | ||
| ieee1394 | ||
| infiniband | ||
| input | ||
| isdn | ||
| leds | ||
| lguest | ||
| macintosh | ||
| mca | ||
| md | ||
| media | ||
| memstick | ||
| message | ||
| mfd | ||
| misc | ||
| mmc | ||
| mtd | ||
| net | ||
| nubus | ||
| of | ||
| oprofile | ||
| parisc | ||
| parport | ||
| pci | ||
| pcmcia | ||
| platform | ||
| pnp | ||
| power | ||
| ps3 | ||
| rapidio | ||
| regulator | ||
| rtc | ||
| s390 | ||
| sbus | ||
| scsi | ||
| serial | ||
| sh | ||
| sn | ||
| spi | ||
| ssb | ||
| staging | ||
| tc | ||
| telephony | ||
| thermal | ||
| uio | ||
| usb | ||
| uwb | ||
| video | ||
| virtio | ||
| w1 | ||
| watchdog | ||
| xen | ||
| zorro | ||
| Kconfig | ||
| Makefile | ||