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[玩法/技巧] 黑白裙均可！DS918+ 使用Nvme SSD做存储空间的技巧

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发表于 2020-2-11 17:14:29 | 查看全部阅读模式

本帖最后由 jimmyjin 于 2020-2-11 19:50 编辑

在帖子http://www.gebi1.com/thread-295316-1-1.html 里我讨论了如何像白裙DS918+一样使用Nvme SSD 做缓存，这篇说的是如何用Nvme SSD做存储空间目前的限制是只能做单盘basic空间，怎么做多盘RAID1， RAID5我还要研究一下。
这是在我的万兆网卡下的SMB读写速度：

写到最后下降了，因为这块东芝RC500 250G SSD的SLC模拟缓存用完了.......

建立NVme存储分区的步骤：
不好意思，我就原文copy reddit论坛里面的内容了，能操作的，自然看得懂这点英文，看不懂的，我觉得没有办法避免误操作的风险（毁原有存储空间），还是不要试了。我故意不返程

ls /dev/nvme*

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You will see the /dev/nvme0n1 or /dev/nvme1n1 depend on which slot you install the SSD.

type:

fdisk -l /dev/nvme0n1

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You wil see the disk information. ( if your SSD at slot 2, use /dev/nvme1n1 instead)

Now, create partition. Type:

synopartition --part /dev/nvme0n1 12

and answer 'Y' if you confirm

Device Sectors (Version8: SupportRaid) /dev/nvme0n11 4980480 (2431 MB) /dev/nvme0n12 4194304 (2048 MB)Reserved size: 260352 ( 127 MB)Primary data partition will be created.WARNING: This action will erase all data on '/dev/nvme0n1' and repart it, are you sure to continue? [y/N]yCleaning all partitions...Creating sys partitions...Creating primary data partition...Please remember to mdadm and mkfs new partitions.

it will create the partition that follow DSM required layout.

Type

fdisk -l /dev/nvme0n1

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You will see the partition layout is created

Disk /dev/nvme0n1: 238.5 GiB, 256060514304 bytes, 500118192 sectorsUnits: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisklabel type: dosDisk identifier: 0xef61a3e4Device Boot Start End Sectors Size Id Type/dev/nvme0n1p1 2048 4982527 4980480 2.4G fd Linux raid autodetect/dev/nvme0n1p2 4982528 9176831 4194304 2G fd Linux raid autodetect/dev/nvme0n1p3 9437184 500103449 490666266 234G fd Linux raid autodetect
Create Basic Disk

I have only tried to create Basic Disk Volume as I have only one SSD. For other type of volume/storage pool (RAID0, RAID1, SHR) , I have not tested.

For Basic Disk, it need to create a single partition RAID1 device in order for DSM to recognize it. (as this is what DSM Storage Manager will do when create a Basic Disk Volume)

Type

cat /proc/mdstat

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To see your current RAID setup

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]md2 : active raid1 sda3[0] sdb3[1] 5855700544 blocks super 1.2 [2/2] [UU]md3 : active raid1 sdc3[0] sdd3[1] 9761614848 blocks super 1.2 [2/2] [UU]md1 : active raid1 sda2[0] sdb2[1] sdc2[2] sdd2[3] 2097088 blocks [4/4] [UUUU]md0 : active raid1 sda1[0] sdb1[3] sdc1[1] sdd1[2] 2489920 blocks [4/4] [UUUU]

AFAIK, md0 is system partition and md1 is system swap. You current volume/storage pool will start at md2.

To current your NVME Basic disk, type:

mdadm --create /dev/md4 --level=1 --raid-devices=1 --force /dev/nvme0n1p3

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(if md4 already exist, you should use next md number)

And answer y

mdadm: Note: this array has metadata at the start and may not be suitable as a boot device. If you plan to store '/boot' on this device please ensure that your boot-loader understands md/v1.x metadata, or use --metadata=0.90Continue creating array? ymdadm: Defaulting to version 1.2 metadatamdadm: array /dev/md5 started.
Create Filesystem

Type

mkfs.ext4 -F /dev/md5

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as I use ext4

mke2fs 1.42.6 (21-Sep-2012)Filesystem label=1.42.6-23824OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)Stride=0 blocks, Stripe width=0 blocks15335424 inodes, 61333024 blocks25600 blocks (0.04%) reserved for the super userFirst data block=0Maximum filesystem blocks=22103982081872 block groups32768 blocks per group, 32768 fragments per group8192 inodes per groupSuperblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872Allocating group tables: doneWriting inode tables: doneCreating journal (32768 blocks): doneWriting superblocks and filesystem accounting information: done

if need btrfs, type

mkfs.btrfs -f /dev/md5

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which can use for vm storage

After format complete , type

reboot

and after the machine bootup, you will see the Volume in DSM Storage Manager

没有回复可见内容，不用回复“ 谢谢分享”，我反对回复可见机制

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[玩法/技巧] 黑白裙均可！DS918+ 使用Nvme SSD做存储空间的技巧

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