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Diff between 4k and 512 byte
Hi just want to know what is the diff between 4k sector and 512byte?
And which is my HDD using ?
I'm using 4x1TB drives on my nv+ thinking of upgrading to 4x2TB red wd drives.
Or should i just backup my data and just add fresh HDD in then transfer data back in?
Thanks :)
Disk /dev/hde doesn't contain a valid partition table
Disk /dev/hdc: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdc1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdc2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdc3 4608002 1953092233 974242116 5 Extended
/dev/hdc5 4608003 1953092233 974242115+ 8e Linux LVM
Disk /dev/hde: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Disk /dev/hdg: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdg1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdg2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdg3 4608002 1953092233 974242116 5 Extended
/dev/hdg5 4608003 1953092233 974242115+ 8e Linux LVM
Disk /dev/hdi: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdi1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdi2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdi3 4608002 1953092233 974242116 5 Extended
/dev/hdi5 4608003 1953092233 974242115+ 8e Linux LVM
And which is my HDD using ?
I'm using 4x1TB drives on my nv+ thinking of upgrading to 4x2TB red wd drives.
Or should i just backup my data and just add fresh HDD in then transfer data back in?
Thanks :)
Disk /dev/hde doesn't contain a valid partition table
Disk /dev/hdc: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdc1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdc2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdc3 4608002 1953092233 974242116 5 Extended
/dev/hdc5 4608003 1953092233 974242115+ 8e Linux LVM
Disk /dev/hde: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Disk /dev/hdg: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdg1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdg2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdg3 4608002 1953092233 974242116 5 Extended
/dev/hdg5 4608003 1953092233 974242115+ 8e Linux LVM
Disk /dev/hdi: 999.9 GB, 999991611392 bytes
255 heads, 63 sectors/track, 121575 cylinders, total 1953108616 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/hdi1 2 4096001 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/hdi2 4096002 4608001 256000 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdi3 4608002 1953092233 974242116 5 Extended
/dev/hdi5 4608003 1953092233 974242115+ 8e Linux LVM
2 Replies
Replies have been turned off for this discussion
- None of your start blocks are divisible by 8, so you do not have 4K alignment.
Performance is better if you are 4K aligned - to do that you'd need to back up your settings, power down, and install all 4 of the new drives (labeling the slot of the old ones). Power on, and the new system will do a clean install.
Then re-install any add-ons, restore the config (in that order) and then restore the data from backup.
Note that if something goes wrong, your old RAID array still is functional. Just power down, reinsert the drives, power up and you will have the old setup back. StephenB wrote: None of your start blocks are divisible by 8, so you do not have 4K alignment.
Performance is better if you are 4K aligned - to do that you'd need to back up your settings, power down, and install all 4 of the new drives (labeling the slot of the old ones). Power on, and the new system will do a clean install.
Then re-install any add-ons, restore the config (in that order) and then restore the data from backup.
Note that if something goes wrong, your old RAID array still is functional. Just power down, reinsert the drives, power up and you will have the old setup back.
Thanks for the info will put in fresh HDD for 4k setup :)
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