{"id":714,"date":"2012-12-16T06:01:19","date_gmt":"2012-12-16T06:01:19","guid":{"rendered":"http:\/\/poojanwagh.opalstacked.com\/techblog\/?p=714"},"modified":"2014-08-13T22:49:55","modified_gmt":"2014-08-13T22:49:55","slug":"sandisk-5000-ssd-measurements","status":"publish","type":"post","link":"https:\/\/tech.poojanblog.com\/blog\/unix-linux\/sandisk-5000-ssd-measurements\/","title":{"rendered":"Sandisk 5000 SSD Measurements"},"content":{"rendered":"

These are a couple of old 8GB (7.5GbB). Their specs are like so:<\/p>\n
\nserver% sudo smartctl -d atacam -i \/dev\/ada4
\nsmartctl 6.0 2012-10-10 r3643 [FreeBSD 9.0-RELEASE amd64] (local build)
\nCopyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org<\/p>\n

=== START OF INFORMATION SECTION ===
\nDevice Model: SanDisk SSD SATA 5000 2.5
\nSerial Number: 00404300490
\nLU WWN Device Id: 5 001b47 930303334
\nFirmware Version: 1.22
\nUser Capacity: 8,012,390,400 bytes [8.01 GB]
\nSector Size: 512 bytes logical\/physical
\nRotation Rate: Solid State Device
\nDevice is: Not in smartctl database [for details use: -P showall]
\nATA Version is: ATA\/ATAPI-7 T13\/1532D revision 4a
\nSATA Version is: SATA 2.6, 1.5 Gb\/s
\nLocal Time is: Sat Dec 15 23:45:03 2012 CST
\nSMART support is: Ambiguous – ATA IDENTIFY DEVICE words 82-83 don’t show if SMART supported.
\nSMART support is: Available – device has SMART capability.
\nSMART support is: Enabled
\n<\/code>\n

Doing sequential read measurements (I have two of these SSD’s, one as tank_zil0 and one as tank_zil1):<\/p>\n
\nserver% sudo dd if=\/dev\/gpt\/tank_zil1 of=\/dev\/null bs=1M count=1000
\n1000+0 records in
\n1000+0 records out
\n1048576000 bytes transferred in 14.487853 secs (72376217 bytes\/sec)
\nserver% sudo dd if=\/dev\/gpt\/tank_zil0 of=\/dev\/null bs=1M count=1000
\n1000+0 records in
\n1000+0 records out
\n1048576000 bytes transferred in 14.557015 secs (72032349 bytes\/sec)
\n<\/code>\n

Doing sequential write measurements:<\/p>\n<\/p>\n

server% sudo dd if=\/dev\/zero of=\/dev\/gpt\/tank_zil0 bs=1M count=1000
\n1000+0 records in
\n1000+0 records out
\n1048576000 bytes transferred in 15.465034 secs (67803019 bytes\/sec)
\nserver% sudo dd if=\/dev\/zero of=\/dev\/gpt\/tank_zil1 bs=1M count=1000
\n1000+0 records in
\n1000+0 records out
\n1048576000 bytes transferred in 15.584851 secs (67281747 bytes\/sec)<\/p>\n

<\/code>\n

I didn’t want to write directly to the raw device, as I didn’t want to delete the GPT partition table. Anyway, it’s roughly 70 MB\/s read and 67 MB\/s write.<\/p>\n

I was wondering if it’s time to upgrade to a USB 3.0 drive. In particular, the Lexar Triton drive seem really fast. However, they aren’t that<\/em> much faster–roughly around 110 MB\/s in smaller capacities (16GB). As of time of writing, they’re available on NewEgg for around $40. That would set me back $80 for 2, albeit at double the capacity of my current ZIL. (I have my ZIL mirrored).<\/p>\n

The SanDisk Extreme 16GB<\/a> comes close; users report around 58 MB\/s sequential (1MB block size) writes, and it currently goes for around $25. Similarly, the ADATA S102<\/a> in 32GB capacity is around 50 MB\/s write (according to manufacturer specs).<\/p>\n

My point is that I bought the SanDisk SATA SSD’s years ago, and they are still quite fast. I don’t feel a need to upgrade. I was contemplating upgrading since I am running short on SATA ports. However, I will probably buy a (cheaper) USB 3.0 enclosure and move a hard drive outside. (The additional hard drives are merely for backup.)<\/p>\n