Hello,
I've got this SanDisk 32GB SDSDU-032G-A11 uSDHC card [1]. [2] summarizes its features as Allocation Unit = 12 MB, Write Size = 64 KB, Page Size = 16 KB, FAT Location = 4-12 MB.
Can you please tell me how these translate into fdisk and mkfs.ext4 settings to format the card as a single ext4 partition having an optimal performance and wear?
Regards, Maciek
[1] http://lists.linaro.org/pipermail/flashbench-results/2012-June/000303.html [2] https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurve...
W dniu 07.04.2013 01:13, Maciej Sieczka pisze:
I've got this SanDisk 32GB SDSDU-032G-A11 uSDHC card [1]. [2] summarizes its features as Allocation Unit = 12 MB, Write Size = 64 KB, Page Size = 16 KB, FAT Location = 4-12 MB.
Can you please tell me how these translate into fdisk and mkfs.ext4 settings to format the card as a single ext4 partition having an optimal performance and wear?
Regards, Maciek
[1] http://lists.linaro.org/pipermail/flashbench-results/2012-June/000303.html [2] https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurve...
As I had lost the original vendor's partition scheme on my card, I have formatted it in a camera, as recommended in [3].
Now it's:
### $ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 31.9 GB, 31914983424 bytes, 62333952 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System /dev/sdb1 8192 62332927 31162368 c W95 FAT32 (LBA) ###
This is a slightly shorter partition than the default [1] 8192-62333951 sectors. cfdisk shows:
### Size: 31914983424 bytes, 31.9 GB Heads: 255 Sectors per Track: 63 Cylinders: 3880
Name Flags Part Type FS Type [Label] Sectors ------------------------------------------------------------------ Pri/Log Free Space 8192* sdb1 Primary vfat 62324736* Pri/Log Free Space 1024* ###
Is that OK or should I extend sdb1 to the remaining 1024 free space?
For the mkfs.ext4, I know I'm supposed to use "-O ^has_journal -E stride=<number1>,stripe-width=<number2> -b <number3>". Could anyone please tell me what are the correct numbers for SDSDU-032G-A11?
Maciek
[3] http://lists.linaro.org/pipermail/flashbench-results/2012-July/000321.html
If you want only 1 partition then do not create any. Call mkfs.ext4 directly for the device.
Csordás Csaba Ifj.
On Sun, Apr 7, 2013 at 11:10 AM, Maciej Sieczka msieczka@sieczka.org wrote:
W dniu 07.04.2013 01:13, Maciej Sieczka pisze:
I've got this SanDisk 32GB SDSDU-032G-A11 uSDHC card [1]. [2] summarizes its features as Allocation Unit = 12 MB, Write Size = 64 KB, Page Size = 16 KB, FAT Location = 4-12 MB.
Can you please tell me how these translate into fdisk and mkfs.ext4 settings to format the card as a single ext4 partition having an optimal performance and wear?
Regards, Maciek
[1] http://lists.linaro.org/pipermail/flashbench-results/2012-June/000303.html [2]
https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurve...
As I had lost the original vendor's partition scheme on my card, I have formatted it in a camera, as recommended in [3].
Now it's:
### $ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 31.9 GB, 31914983424 bytes, 62333952 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System /dev/sdb1 8192 62332927 31162368 c W95 FAT32 (LBA) ###
This is a slightly shorter partition than the default [1] 8192-62333951 sectors. cfdisk shows:
### Size: 31914983424 bytes, 31.9 GB Heads: 255 Sectors per Track: 63 Cylinders: 3880
Name Flags Part Type FS Type [Label] Sectors
Pri/Log Free Space 8192*sdb1 Primary vfat 62324736* Pri/Log Free Space 1024* ###
Is that OK or should I extend sdb1 to the remaining 1024 free space?
For the mkfs.ext4, I know I'm supposed to use "-O ^has_journal -E stride=<number1>,stripe-width=<number2> -b <number3>". Could anyone please tell me what are the correct numbers for SDSDU-032G-A11?
Maciek
[3] http://lists.linaro.org/pipermail/flashbench-results/2012-July/000321.html
-- Maciej Sieczka http://www.sieczka.org
Flashbench-results mailing list Flashbench-results@lists.linaro.org http://lists.linaro.org/mailman/listinfo/flashbench-results
W dniu 07.04.2013 15:49, Csordás Csaba Ifj. pisze:
If you want only 1 partition then do not create any. Call mkfs.ext4 directly for the device.
And what would be the most appropriate stride, stripe width and block size settings for my card?
On Sun, Apr 7, 2013 at 11:10 AM, Maciej Sieczka msieczka@sieczka.org wrote:
W dniu 07.04.2013 01:13, Maciej Sieczka pisze:
I've got this SanDisk 32GB SDSDU-032G-A11 uSDHC card [1]. [2] summarizes its features as Allocation Unit = 12 MB, Write Size = 64 KB, Page Size = 16 KB, FAT Location = 4-12 MB.
Can you please tell me how these translate into fdisk and mkfs.ext4 settings to format the card as a single ext4 partition having an optimal performance and wear?
[1] http://lists.linaro.org/pipermail/flashbench-results/2012-June/000303.html [2]
https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurve...
As I had lost the original vendor's partition scheme on my card, I have formatted it in a camera, as recommended in [3].
Now it's:
### $ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 31.9 GB, 31914983424 bytes, 62333952 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System/dev/sdb1 8192 62332927 31162368 c W95 FAT32 (LBA) ###
This is a slightly shorter partition than the default [1] 8192-62333951 sectors. cfdisk shows:
### Size: 31914983424 bytes, 31.9 GB Heads: 255 Sectors per Track: 63 Cylinders: 3880
Name Flags Part Type FS Type [Label] Sectors
Pri/Log Free Space 8192*sdb1 Primary vfat 62324736* Pri/Log Free Space 1024* ###
Is that OK or should I extend sdb1 to the remaining 1024 free space?
For the mkfs.ext4, I know I'm supposed to use "-O ^has_journal -E stride=<number1>,stripe-width=<number2> -b <number3>". Could anyone please tell me what are the correct numbers for SDSDU-032G-A11?
[3] http://lists.linaro.org/pipermail/flashbench-results/2012-July/000321.html
Hi,
this questions could be authoritatively answered by Arnd Bergmann. Be patient until he comes back and answers/corrects all of our questions/assumptions. :-)
Csordás Csaba Ifj.
On Mon, Apr 8, 2013 at 11:05 PM, Maciej Sieczka msieczka@sieczka.org wrote:
W dniu 07.04.2013 15:49, Csordás Csaba Ifj. pisze:
If you want only 1 partition then do not create any. Call mkfs.ext4 directly for the device.
And what would be the most appropriate stride, stripe width and block size settings for my card?
On Sun, Apr 7, 2013 at 11:10 AM, Maciej Sieczka msieczka@sieczka.org wrote:
W dniu 07.04.2013 01:13, Maciej Sieczka pisze:
I've got this SanDisk 32GB SDSDU-032G-A11 uSDHC card [1]. [2] summarizes its features as Allocation Unit = 12 MB, Write Size = 64 KB, Page Size = 16 KB, FAT Location = 4-12 MB.
Can you please tell me how these translate into fdisk and mkfs.ext4 settings to format the card as a single ext4 partition having an optimal performance and wear?
[1]
http://lists.linaro.org/pipermail/flashbench-results/2012-June/000303.html [2]
https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurve...
As I had lost the original vendor's partition scheme on my card, I have formatted it in a camera, as recommended in [3].
Now it's:
### $ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 31.9 GB, 31914983424 bytes, 62333952 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System/dev/sdb1 8192 62332927 31162368 c W95 FAT32 (LBA) ###
This is a slightly shorter partition than the default [1] 8192-62333951 sectors. cfdisk shows:
### Size: 31914983424 bytes, 31.9 GB Heads: 255 Sectors per Track: 63 Cylinders: 3880
Name Flags Part Type FS Type [Label] Sectors
Pri/Log Free Space 8192*sdb1 Primary vfat 62324736* Pri/Log Free Space 1024* ###
Is that OK or should I extend sdb1 to the remaining 1024 free space?
For the mkfs.ext4, I know I'm supposed to use "-O ^has_journal -E stride=<number1>,stripe-width=<number2> -b <number3>". Could anyone please tell me what are the correct numbers for SDSDU-032G-A11?
[3]
http://lists.linaro.org/pipermail/flashbench-results/2012-July/000321.html
-- Maciej Sieczka http://www.sieczka.org
flashbench-results@lists.linaro.org
-
Csordás Csaba Ifj. -
Maciej Sieczka