IBM FlashSystem 840 eng

Nov 23, 20141 like1,239 views

The document summarizes performance tests conducted on an IBM FlashSystem 840 storage array. Key findings from the tests include: 1) The array delivered over 500,000 IOPS in a test with a 100% random workload and 80% reads/20% writes using 4KB blocks. 2) Maximum performance was achieved with a 60-70% read/30-40% write workload mix rather than 100% reads. 3) Updating the array's firmware while under a 100K IOPS workload caused only a brief drop in performance and a slight increase in response times, demonstrating that firmware updates can be performed with minimal impact even under moderate load.

Performance test IBM FlashSystem 840
1
Performance Test IBM FlashSystem 840
Configuration available IBM FlashSystem 840:
- Available 8х Flash Module eMLC (max up to 12хFlash Module) 2TB (real 1,87TB), 1 - hotspare, 7 – in RAID 5
- Available 8x8Gb FC host interfaces (max up to 16x8Gb FC)
Declared vendor performance for IBM FlashSystem 840 up to 775K iops, block size 4KB 100%Random, 70%/30% Read/Write.
We perform tests for determination of achievable performance indicators IBM FlashSystem 840 in the existing configuration (only 8хFlash Module).
In the test landscape 32хLU IBM FlashSystem 840 were presented (over FC-SAN) two servers IBM POWER System S822 (4х8Gb FC - each server, total - 8x8Gb FC, It means that as much as in IBM FlashSystem 840) 16хLU on single server. Servers IBM POWER System S822 used with Dual VIOS and FC NPIV.
On each test server/LPAR, LU was aggregated using AIX LVM (stripe). Test data were placed on JFS2 file system with inline log and options - noatime, cio. File System (4TB size) was filled data> 80%, the amount of data used by all.
The first test showed a linear READ speed performance - more 5GBps (Diagram 1).
Diagram 1

Performance test IBM FlashSystem 840
2
The next test WRITE speed performance showed almost 2GBps (Diagram 2).
Diagram 2
The multi-thread test - 100% Random, Read/Write=80/20, block size 4KB – performance over 500K iops (Diagram 3).
Diagram 3

Performance test IBM FlashSystem 840
3
Repeat test with multi-thread workload - 100% Random, Read/Write=80/20, changing the size of the data block (Diagram 4 – performance in iops, Diagram 5 – the response time of the disk subsystem in ms).
4KB
8KB
16KB
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64KB
128KB
IBM FlashSystem 840
507724
325057
174311
90340
45839
23059
0
100000
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IOPS
Diagram 4 - IBM FlashSystem 840
100% Random, Read/Write= 80/20
0
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4KB
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ms
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IBM FlashSystem 840, write ms
0.6
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IBM FlashSystem 840, read ms
1.2
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9.6
18.8
34.5
Diagram 5 - IBM FlashSystem 840
average latency

Performance test IBM FlashSystem 840
4
And for the next test will leave the fixed data block size - 8KB, and will change the ratio Read/Write. As shown in Diagram 6 - maximum performance was achieved at a ratio other than 100% Read.
100%
Write
10%
Read
90%
Write
20%
Read
80%
Write
30%
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70%
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40%
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60%
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50%
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50%
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60%
Read
40%
Write
70%
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30%
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80%
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20%
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90%
Read
10%
Write
100%
Read
IBM FlashSystem 840
187480
199834
213311
226443
241190
257174
274482
296792
325265
385369
378269
0
50000
100000
150000
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IOPS
Diagram 6 - IBM FlashSystem 840
100% Random, Read/Write= 0/100-100/0

Performance test IBM FlashSystem 840
5
Next, consider some aspect - how to change the performance of IBM FlashSystem 840 when updating firmware? Vendors always recommend updating firmware in the minimal load window, but never specify that under this understanding ... 1K iops, 10K iops, 100K iops?
Generate a load of about ~ 100K iops - 100% Random, Read/Write = 80/20, the block size 8KB, and simultaneously start firmware update for IBM FlashSystem 840. As shown in Diagram 7 and 8, slow performance very short (directly while upgrading controllers - more detailed this situation is shown in Diagram 9) and a slight increase in response time is during the verification RAID stripes.
Diagram 7
Diagram 8
0
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16:10
16:16
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17:38
17:44
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18:11
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19:06
Disk xfers
IO/sec
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
16:10
16:16
16:21
16:27
16:32
16:38
16:43
16:49
16:54
17:00
17:05
17:11
17:16
17:22
17:27
17:33
17:38
17:44
17:49
17:55
18:00
18:06
18:11
18:17
18:22
18:28
18:33
18:39
18:44
18:50
18:55
19:01
19:06
Disk Service Time msec/xfer

Performance test IBM FlashSystem 840
6
Diagram 9

Performance test IBM FlashSystem 840
7
Thank you for your attention!
Oleg Korol
November 2014
http://ua.linkedin.com/pub/oleg-korol/26/920/716/

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1. Performance test IBM FlashSystem 840 1 Performance Test IBM FlashSystem 840 Configuration available IBM FlashSystem 840: - Available 8х Flash Module eMLC (max up to 12хFlash Module) 2TB (real 1,87TB), 1 - hotspare, 7 – in RAID 5 - Available 8x8Gb FC host interfaces (max up to 16x8Gb FC) Declared vendor performance for IBM FlashSystem 840 up to 775K iops, block size 4KB 100%Random, 70%/30% Read/Write. We perform tests for determination of achievable performance indicators IBM FlashSystem 840 in the existing configuration (only 8хFlash Module). In the test landscape 32хLU IBM FlashSystem 840 were presented (over FC-SAN) two servers IBM POWER System S822 (4х8Gb FC - each server, total - 8x8Gb FC, It means that as much as in IBM FlashSystem 840) 16хLU on single server. Servers IBM POWER System S822 used with Dual VIOS and FC NPIV. On each test server/LPAR, LU was aggregated using AIX LVM (stripe). Test data were placed on JFS2 file system with inline log and options - noatime, cio. File System (4TB size) was filled data> 80%, the amount of data used by all. The first test showed a linear READ speed performance - more 5GBps (Diagram 1). Diagram 1

2. Performance test IBM FlashSystem 840 2 The next test WRITE speed performance showed almost 2GBps (Diagram 2). Diagram 2 The multi-thread test - 100% Random, Read/Write=80/20, block size 4KB – performance over 500K iops (Diagram 3). Diagram 3

3. Performance test IBM FlashSystem 840 3 Repeat test with multi-thread workload - 100% Random, Read/Write=80/20, changing the size of the data block (Diagram 4 – performance in iops, Diagram 5 – the response time of the disk subsystem in ms). 4KB 8KB 16KB 32KB 64KB 128KB IBM FlashSystem 840 507724 325057 174311 90340 45839 23059 0 100000 200000 300000 400000 500000 600000 IOPS Diagram 4 - IBM FlashSystem 840 100% Random, Read/Write= 80/20 0 5 10 15 20 25 4KB 8KB 16KB 32KB 64KB 128KB ms 4KB 8KB 16KB 32KB 64KB 128KB IBM FlashSystem 840, write ms 0.6 1.1 2.9 7.6 16.2 31 IBM FlashSystem 840, read ms 1.2 2.4 4.8 9.6 18.8 34.5 Diagram 5 - IBM FlashSystem 840 average latency

4. Performance test IBM FlashSystem 840 4 And for the next test will leave the fixed data block size - 8KB, and will change the ratio Read/Write. As shown in Diagram 6 - maximum performance was achieved at a ratio other than 100% Read. 100% Write 10% Read 90% Write 20% Read 80% Write 30% Read 70% Write 40% Read 60% Write 50% Read 50% Write 60% Read 40% Write 70% Read 30% Write 80% Read 20% Write 90% Read 10% Write 100% Read IBM FlashSystem 840 187480 199834 213311 226443 241190 257174 274482 296792 325265 385369 378269 0 50000 100000 150000 200000 250000 300000 350000 400000 450000 IOPS Diagram 6 - IBM FlashSystem 840 100% Random, Read/Write= 0/100-100/0

5. Performance test IBM FlashSystem 840 5 Next, consider some aspect - how to change the performance of IBM FlashSystem 840 when updating firmware? Vendors always recommend updating firmware in the minimal load window, but never specify that under this understanding ... 1K iops, 10K iops, 100K iops? Generate a load of about ~ 100K iops - 100% Random, Read/Write = 80/20, the block size 8KB, and simultaneously start firmware update for IBM FlashSystem 840. As shown in Diagram 7 and 8, slow performance very short (directly while upgrading controllers - more detailed this situation is shown in Diagram 9) and a slight increase in response time is during the verification RAID stripes. Diagram 7 Diagram 8 0 20000 40000 60000 80000 100000 120000 140000 16:10 16:16 16:21 16:27 16:32 16:38 16:43 16:49 16:54 17:00 17:05 17:11 17:16 17:22 17:27 17:33 17:38 17:44 17:49 17:55 18:00 18:06 18:11 18:17 18:22 18:28 18:33 18:39 18:44 18:50 18:55 19:01 19:06 Disk xfers IO/sec 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 16:10 16:16 16:21 16:27 16:32 16:38 16:43 16:49 16:54 17:00 17:05 17:11 17:16 17:22 17:27 17:33 17:38 17:44 17:49 17:55 18:00 18:06 18:11 18:17 18:22 18:28 18:33 18:39 18:44 18:50 18:55 19:01 19:06 Disk Service Time msec/xfer

6. Performance test IBM FlashSystem 840 6 Diagram 9

7. Performance test IBM FlashSystem 840 7 Thank you for your attention! Oleg Korol November 2014 http://ua.linkedin.com/pub/oleg-korol/26/920/716/

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