?
Thanks
Chris
*From:*Igor [mailto:i...@4friends.od.ua]
*Sent:* 22 May 2013 15:07
*To:* user@cassandra.apache.org
*Subject:* Re: High performance disk io
Hello
What level of read performance do you expect? We have limit 15 ms for
99 percentile with average read latency near 0.9ms. For some CF 99
the same setup.
Chris
From: Igor [mailto:i...@4friends.od.ua]
Sent: 23 May 2013 15:00
To: user@cassandra.apache.org
Subject: Re: High performance disk io
Hello Christopher,
BTW, are you talking about 99th percentiles on client side, or about
percentiles from cassandra histograms for CF
moving all of nodes to have the same setup.
** **
** **
Chris
** **
*From:* Igor [mailto:i...@4friends.od.ua]
*Sent:* 23 May 2013 15:00
*To:* user@cassandra.apache.org
*Subject:* Re: High performance disk io
** **
Hello Christopher,
BTW, are you talking about 99th
one SSD against that. Then have a dedicated SSD per large column family.
We’re now moving all of nodes to have the same setup.
Chris
From: Igor [mailto:i...@4friends.od.ua]
Sent: 23 May 2013 15:00
To: user@cassandra.apache.org
Subject: Re: High performance disk io
Hello,
We're looking at deploying a new ring where we want the best possible read
performance.
We've setup a cluster with 6 nodes, replication level 3, 32Gb of memory, 8Gb
Heap, 800Mb keycache, each holding 40/50Gb of data on a 200Gb SSD and 500Gb
SATA for OS and commitlog
Three column
Hello
What level of read performance do you expect? We have limit 15 ms for 99
percentile with average read latency near 0.9ms. For some CF 99
percentile actually equals to 2ms, for other - to 10ms, this depends on
the data volume you read in each query.
Tuning read performance involved
Date: Wednesday, May 22, 2013 8:06 AM
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: High performance disk io
Hello
What level of read performance do you expect? We have limit 15 ms for 99
percentile
not options.
Do you use SSDs or multiple SSDs in any kind of configuration or RAID?
Thanks
Chris
From: Igor [mailto:i...@4friends.od.ua]
Sent: 22 May 2013 15:07
To: user@cassandra.apache.org
Subject: Re: High performance disk io
Hello
What level of read performance do you expect
price tag easily
worth the effort.
Cheers,
Chris
-Original Message-
From: Hiller, Dean [mailto:dean.hil...@nrel.gov]
Sent: 22 May 2013 15:33
To: user@cassandra.apache.org
Subject: Re: High performance disk io
Well, if you just want to lower your I/O util %, you could always just add
more
?
No, single SSD per host
Thanks
Chris
*From:*Igor [mailto:i...@4friends.od.ua]
*Sent:* 22 May 2013 15:07
*To:* user@cassandra.apache.org
*Subject:* Re: High performance disk io
Hello
What level of read performance do you expect? We have limit 15 ms for
99 percentile with average read latency near
: Re: High performance disk io
On 05/22/2013 05:41 PM, Christopher Wirt wrote:
Hi Igor,
Yea same here, 15ms for 99 th percentile is our max. Currently getting one or
two ms for most CF. It goes up at peak times which is what we want to avoid.
Our 99 percentile also goes up at peak times
@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: High performance disk io
For us, the biggest killer is repair and compaction following repair. If you
are running VNodes, you need to test the performance while running repair.
From: Igor i...@4friends.od.uamailto:i
how it goes.
-Wei
- Original Message -
From: Dean Hiller dean.hil...@nrel.gov
To: user@cassandra.apache.org, Wei Zhu wz1...@yahoo.com
Sent: Wednesday, May 22, 2013 12:19:44 PM
Subject: Re: High performance disk io
If you are only running repair on one node, should it not skip
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