update ticdc recommended disk size (pingcap#6952)

Frank945946 · Nov 24, 2021 · 8a9031a · 8a9031a
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Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/hardware-and-software-requirements.md b/hardware-and-software-requirements.md
@@ -91,11 +91,11 @@ You can deploy and run TiDB on the 64-bit generic hardware server platform in th
 Before you deploy TiFlash, note the following items:
 
 - TiFlash can be [deployed on multiple disks](/tiflash/tiflash-configuration.md#multi-disk-deployment).
-- It is recommended to use a high-performance SSD as the first disk of the TiFlash data directory to buffer the real-time replication of TiKV data. The performance of this disk should not be lower than that of TiKV, such as PCI-E SSD. The disk capacity should be no less than 10% of the total capacity; otherwise, it might become the bottleneck of this node. You can deploy ordinary SSDs for other disks, but note that a better PCI-E SSD brings better performance. 
+- It is recommended to use a high-performance SSD as the first disk of the TiFlash data directory to buffer the real-time replication of TiKV data. The performance of this disk should not be lower than that of TiKV, such as PCI-E SSD. The disk capacity should be no less than 10% of the total capacity; otherwise, it might become the bottleneck of this node. You can deploy ordinary SSDs for other disks, but note that a better PCI-E SSD brings better performance.
 - It is recommended to deploy TiFlash on different nodes from TiKV. If you must deploy TiFlash and TiKV on the same node, increase the number of CPU cores and memory, and try to deploy TiFlash and TiKV on different disks to avoid interfering each other.
 - The total capacity of the TiFlash disks is calculated in this way: `the data volume of the entire TiKV cluster to be replicated / the number of TiKV replicas * the number of TiFlash replicas`. For example, if the overall planned capacity of TiKV is 1 TB, the number of TiKV replicas is 3, and the number of TiFlash replicas is 2, then the recommended total capacity of TiFlash is `1024 GB / 3 * 2`. You can replicate only the data of some tables. In such case, determine the TiFlash capacity according to the data volume of the tables to be replicated.
 
-Before you deploy TiCDC, note that it is recommended to deploy TiCDC on PCIe-SSD disks larger than 200 GB.
+Before you deploy TiCDC, note that it is recommended to deploy TiCDC on PCIe-SSD disks larger than 1 TB.
 
 ## Network requirements