구차니의 잡동사니 모음

[1021784.635712] :eth0: link up, full duplex, speed 1 Gbps

[1028414.663257] :eth0: link down

[1028414.666737] :eth0: link up, full duplex, speed 1 Gbps

[1028461.461712] :eth0: link down

[1028463.965768] :eth0: link up, full duplex, speed 1 Gbps

[1028900.171094] ata1: wake up from deepsleep, reset link now

[1028900.402572] ata1: device plugged sstatus 0x123

[1028907.171043] ata2: wake up from deepsleep, reset link now

[1028907.402658] ata2: device plugged sstatus 0x123

[1028910.181567] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl F300)

[1028910.301227] ata1.00: configured for UDMA/133

[1028910.305714] ata1: wake up successful, the reset fail can be ignored

[1028941.012559] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl F300)

[1028941.092583] ata2.00: configured for UDMA/133

[1028941.097066] ata2: wake up successful, the reset fail can be ignored

...

[1120631.009260] :eth0: link down

[1120638.963169] :eth0: link up, full duplex, speed 1 Gbps

[1120644.395001] init: nmbd main process (5071) killed by TERM signal

Electrical interface

All SD card families initially use a 3.3 volt electrical interface. On command, SDHC and SDXC cards can switch to 1.8 V operation. 

Ultra High Speed, Phase I (UHS-I) bus design for SDHC and SDXC cards was added in SD spec 3.0. This is a design enhancement to increase the performance of SDHC/SDXC cards.

There is no compatibility problem using a UHS card with a non-UHS device. 

Ultra High Speed Phase II (UHS-II) bus design for SDHC and SDXC was added in SD spec 4.0. This is an additional design enhacement with connector interface modifications to increase performance.

UHS-II specification defines bus architecture for options of 156MB/s and 312MB/s. Manufacturers implemented the 312MB/s option in memory cards. These are theoretical maximum limits and actual maximum performance for a specific card is defined on the label or in advertising.

Host devices will obtain the maximum UHS-II speed when both the card and the host device support UHS-II. Otherwise, the host device and card will use the highest compatible UHS-I or SD bus speed.

There is no compatibility problem using a USH-II card in a UHS-I or non-UHS device.

UHS라는 말이 혼용돼 쓰이기 때문에 조금 헷갈릴 수 있습니다. UHS-I, UHS-II 등은 SD카드의 버스 규격입니다. 파일을 주고 받을 수 있는 틀이라고 보면 됩니다. 그리고 이는 다시 U1, U3 등으로 나뉩니다. 이는 ‘UHS 스피드 클래스’라고 부릅니다. U1은 초당 최소 10MB, U3는 30MB를 쓸 수 있다는 표기입니다. 클래스와 비슷하다고 보면 됩니다.

현재 나오는 제품들은 거의 UHS-I 버스를 씁니다. 그리고 플래시메모리에 따라 실제 속도는 U1과 U3 정도로 나뉜다고 보면 됩니다. 4K 영상을 찍으려면 U3 정도 속도가 필요하고, 풀HD라면 클래스10, 혹은 U1이라고 표기된 제품이면 됩니다. 

Supports next-generation memory cards including SDHC UHS-I, SDXC UHS-I, micro SDHC UHS-I, micro SDXC UHS-I 

오후 3:54 2018-02-04 53.53%

오후 4:05 2018-02-04 54.96%

오후 4:19 2018-02-04 56.69% 

오후 4:23 2018-02-04 57.15%

오후 6:21 2018-02-04 75.30% 

$ sudo -i

We trust you have received the usual lecture from the local System

Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.

    #2) Think before you type.

    #3) With great power comes great responsibility.

Password:

# echo 200000 >> /proc/sys/dev/raid/speed_limit_min

# cat /proc/sys/dev/raid/speed_limit_min

200000

# cat /proc/mdstat

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]

md2 : active raid1 sda3[0]

      3902196544 blocks super 1.2 [1/1] [U]

md3 : active raid1 sdb3[0]

      3902196544 blocks super 1.2 [1/1] [U]

md1 : active raid1 sdb2[1] sda2[0]

      2097088 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]

      2490176 blocks [2/2] [UU]

unused devices: <none>