用TxBench查看了, 只能看到sata ssd的DRAT/RZAT特性，手上两片sata盘，一片sandisk的，支持DRAT，不支持RZAT；一片长城的，DRAT/RZAT两者都不支持。
mx500在NAS中没取下来，不过hdparm可取得信息：
- ash-4.4# hdparm -I /dev/sata1
- /dev/sata1:
- ATA device, with non-removable media
- Model Number: CT2000MX500SSD1
- Serial Number:
- Firmware Revision: M3CR033
- Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
- Standards:
- Used: unknown (minor revision code 0x006d)
- Supported: 10 9 8 7 6 5
- Likely used: 10
- Configuration:
- Logical max current
- cylinders 16383 0
- heads 16 0
- sectors/track 63 0
- --
- LBA user addressable sectors: 268435455
- LBA48 user addressable sectors: 3907029168
- Logical Sector size: 512 bytes
- Physical Sector size: 4096 bytes
- Logical Sector-0 offset: 0 bytes
- device size with M = 1024*1024: 1907729 MBytes
- device size with M = 1000*1000: 2000398 MBytes (2000 GB)
- cache/buffer size = unknown
- Form Factor: 2.5 inch
- Nominal Media Rotation Rate: Solid State Device
- Capabilities:
- LBA, IORDY(can be disabled)
- Queue depth: 32
- Standby timer values: spec'd by Standard, with device specific minimum
- R/W multiple sector transfer: Max = 1 Current = 1
- Advanced power management level: disabled
- DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
- Cycle time: min=120ns recommended=120ns
- PIO: pio0 pio1 pio2 pio3 pio4
- Cycle time: no flow control=120ns IORDY flow control=120ns
- Commands/features:
- Enabled Supported:
- * SMART feature set
- Security Mode feature set
- * Power Management feature set
- * Write cache
- * Look-ahead
- * WRITE_BUFFER command
- * READ_BUFFER command
- * NOP cmd
- * DOWNLOAD_MICROCODE
- Advanced Power Management feature set
- * 48-bit Address feature set
- * Mandatory FLUSH_CACHE
- * FLUSH_CACHE_EXT
- * SMART error logging
- * SMART self-test
- * General Purpose Logging feature set
- * WRITE_{DMA|MULTIPLE}_FUA_EXT
- * 64-bit World wide name
- * WRITE_UNCORRECTABLE_EXT command
- * {READ,WRITE}_DMA_EXT_GPL commands
- * Segmented DOWNLOAD_MICROCODE
- unknown 119[8]
- * Gen1 signaling speed (1.5Gb/s)
- * Gen2 signaling speed (3.0Gb/s)
- * Gen3 signaling speed (6.0Gb/s)
- * Native Command Queueing (NCQ)
- * Phy event counters
- * READ_LOG_DMA_EXT equivalent to READ_LOG_EXT
- * DMA Setup Auto-Activate optimization
- Device-initiated interface power management
- * Software settings preservation
- Device Sleep (DEVSLP)
- * SMART Command Transport (SCT) feature set
- * SCT Features Control (AC4)
- * SCT Data Tables (AC5)
- * SANITIZE_ANTIFREEZE_LOCK_EXT command
- * SANITIZE feature set
- * CRYPTO_SCRAMBLE_EXT command
- * BLOCK_ERASE_EXT command
- * reserved 69[3]
- * reserved 69[4]
- * reserved 69[7]
- * DOWNLOAD MICROCODE DMA command
- * WRITE BUFFER DMA command
- * READ BUFFER DMA command
- * Data Set Management TRIM supported (limit 8 blocks)
- Security:
- Master password revision code = 65534
- supported
- not enabled
- not locked
- frozen
- not expired: security count
- supported: enhanced erase
- 2min for SECURITY ERASE UNIT. 2min for ENHANCED SECURITY ERASE UNIT.
- Logical Unit WWN Device Identifier: 500a0751e599d374
- NAA : 5
- IEEE OUI : 00a075
- Unique ID : 1e599d374
- Device Sleep:
- DEVSLP Exit Timeout (DETO): 100 ms (drive)
- Minimum DEVSLP Assertion Time (MDAT): 10 ms (drive)
- Checksum: correct
有一台920+，是MX500 2TBx2(@sata III)， P7000Z 2TBx1（@pcie2.0*2）, 容量（扇区总数）一致，物理速度相差不大。目前是前者RAID1 + 后者basic，都开启TRIM。
有点想将这三个盘做成RAID5，担心是没法开启RAID5 TRIM，那么存储池的数据清理功能，能不能满足日常使用需求？如果满足不了，那么除SA6400之外的那么多群晖机型，都不能用纯固态盘组RAID5以上使用？似乎说不过去吧。
这样大胆推测，是不是数据清理，只是多占一些CPU，多一些数据I/O，但达到的效果，应该也不差于让盘体本身执行TRIM？
如果这个推测成立，那么，就可以无视RAID5 TRIM支持与否，随便什么机型都可以组全固态的RAID5/6了。
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310112100042806
发表于 2023-8-12 01:24
