I would like to ask you about your opinions how to utilize two SSD disks on webserver.. I read many articles about raid, disk mounting, lvm, disk cache, etc. but still I am not sure how to decide which solution would be best for future using &amp; utilization.. (I don't need do custom backups because of scheduled backups on provider side) See below for a brief description of the server. Thanks in advance for tips  Are there also any other options than RAID? There are any benefits of using SSD disk as cache storage on fully SSD server?  2 threads Xeon 1.70 GHz 8GB RAM 2× 60GB SSD Automatic internal + external backups Snapshots  SW - Debian 8, Apache, MariaDB, ISPConfig  Edit: Server is VPS
16122
This is a  about RAID levels.    What are:   the RAID levels typically used (including the RAID-Z family)?  deployments are they commonly found in? benefits and pitfalls of each?
11496
I was just reading a question on backups with flash drives, but I was not quite sure why SSDs would be better than flash drives for backups.  To me, solid-state drives look like larger versions of flash drives. But surely there must be something that makes the former much more reliable than the latter.  What's the difference between an SSD and just a regular flash drive? For example, do they both use NAND?
105954
Does Raid 1 protect against data corruption?  For example, let's say that I am keeping all of my important files on a NAS that uses 2 disks in a RAID 1.  If one hard drive has some kind of internal problem and the data becomes corrupted, does the RAID recognize this automatically and correct it using data from the other good disk?  Could it even know which copy is the good one?  Does RAID 5 protect against corruption?  I know that RAID is not a backup solution.  I am trying to figure out how to make sure that I am not backing up corrupt data!
30312
What are the benefits of paying for SSD storage when it comes to webhosting? I know that SSDs have better read speeds is that necessarily better or is it negligible?  I have sites that use databases with php so will it really benefit me to pay extra for SSD storage? I read somewhere that SSDs increase fetching times from the db but also read stuff that are contrary to it and the fact that I can cache mysql results using apc or memcached so kind of confused, can someone shed some light please?
70503
What is the best way to do Subversion backups (on a Debian based server).  Is it to use svnadmin?   svnadmin dump /path/to/reponame &gt; reponame.dump   Or maybe just to tar the dir where the repositories are?  tar -cvzf svn.backup.tar.gz /var/subversion/   What are the pros and cons of the above?  Thanks  Johan    Update:  This is a small server with only a handful of repos.  So incremental backups are probably not needed,  I think it is better to focus on keeping it simple.  Update: I used packs wrapper script (that in turn was a wrapper for svn-hot-backup) to do a full backup and then did a full recovery on another clean computer. However I removed that "SVN_HOTBACKUP_NUM_BACKUPS=10" part since it was not working for me.  Please note that I feel it was kind of simple and the result was very close to just tar the dir.  But as Manni pointed out here to use svn-hot-backup/"svnadmin hotcopy" is a more reliable method,  since tar could create corrupt backups from time to time if you are unlucky.
117916
Are SSDs comparable to HDDs for reliability and is there published research on this?  Also are all SSD manufacturers at a similar 'reliability level'?
26521
I have a Virtual Host server build with Ubuntu and Xen  SO   Ubuntu 12.04.1 LTS 64Bits xen-hypervisor-4.1   Disk   Hitachi SAS 15K 147GB (x2) in a Volume group sda1 1GB /boot  sda2 146GB lvm sdb1 147GB lvm   Every virtual machine has minimum two LV (root, swap)  I have available three new disks Hitachi SAS 15K 600GB I want to create a RAID5 with this disk and migrate all partitions from the VG. Is this is possible and how?  I know how to create a simple RAID with  but I want have the flexibility of the VG on my RAID. Is this is possible and how?  My need is to have the flexibility of VG but RAID redundancy.
70826
I'm contemplating setting up a Master-Slave replication for my database. The slave server will be used for redundancy and possibly a reports server. However, one of the biggest issues I'm running into is that we're already maxed out on power at our datacenter. So adding another physical server is not an option.  Our existing database server is fairly under-utilized as far as cpu (load averages never really get above 1 on a quad-core). So the leading idea is to toss in some new drives and double the memory (from 8GB to 16) and run a second mysql instance on the same physical machine. Each instance would have separate disks for the database.   Is there anything wrong with this idea?  Edit (more info): I've (luckily) never had anything bad enough happen to take down the server, but am trying to plan ahead. We of course have nightly backups that we could recover from. But I figured having the redundant data on separate disks would provide a quicker solution if the master server's drives failed (obviously not if the entire machine goes out).   As for the reporting aspect, any tables we would report off of are MyIsam. So doing expensive reads on the same tables that are being written to can bog down the server. My assumption was having a slave server to report off of wouldn't affect the main server as long as we threw enough RAM at it (since cpu load hasn't been an issue yet).
24488
In questions  and in websites everywhere it's noted that SSDs use much less power than HDDs... usually citing ~2 W vs ~6 W for HDDs, my question (and sorry if its stupid just need to be exact) is that per hour? Need to calculate costs savings in power consumption if we switched all our workstations to SSDs
102277
Consider this:   I have one fast server with a Drupal installation but this server does not have access to a lot of disk space. I have another server that isn't quite as fast but does have access to lot of disk space.   My drupal server is hosting a blog and some photo galleries.  I would like my drupal server to use the file server to store its images and files.  How can I achieve such a thing? The file server can be accessed through ftp or sftp.  I'm considering using the storage api for this, it seems like a good fit (?) but I'm not sure how to implement it. The documentation seems a bit off.  Also, the blog uses the wysiwyg module + the media module to allow for image uploads in the body field. How can I make this functionality work with the storage api?  Is there anyone with experience in this field that can help me out?
102095
It is known that after exceeding amount of write procedures to a particular SSD sector this sector dies and is replaced with another one from reserved ones. Please, correct me if I'm wrong.  I suppose it might be unsafe to use SSD disc for very long time. But I would like to know how much damaged is my disc, how many damaged sectors it has? How to get such info? Is there any useful software to check it?
85849
The drive is constantly filling up. You've hunted down all the spare and random files you can. grep'd for coredump files and even removed some of the un-needed backups...  What would be your next move.  The actual server in question has 10GB of website files and the OS shouldn't take any more than 10GB so how do you track down what's filling a 50GB (virtual) drive?
20817
I have purchased a new SSD (120GB) and I had a HDD (1TB) already installed. I will install both Ubuntu and Windows on these drives. As the file space on the SSD is limited and I've read that writing to an SSD drive is discouraged, I would like to store most of the data on the HDD drive. I am aiming at faster system but also keeping the valuable data safe on the more reliable HDD and expanding the life span of the SSD.  I have already set up Windows on these drives (system files and applications on SSD, Users folder and ProgramData on HDD) and now it's time to set up Ubuntu.  So my question is which partitions I should create, on which drive should they be placed and how large they should be.  Based on my experience and articles I've read, I will probably create /swap, /home and / partitions.   Does it seem reasonable to place /swap and /home partitions on the HDD and / on the SSD?  And how large should / partition be?  Also, will the applications be installed in / partition? If so, is it rational to store the applications on separate partitions on the HDD instead of / on the SSD, and what should the size of the / partition be in this case?
68094
I am moving from one server to another and want to bring some of the disks with me. Unfortunately, I do not have enough storage to back up all of the data on the old server.  Old server 4 disk RAID5  Bringing two disks from old server to:  New server 6 DISK RAID-Z2 (4+2)  Old server can take losing one disk but not two.  Could I set up the new server as RAID-Z2 (4+2) lacking one disk? Move all data and then add the last disk?  Or is there any other way around this?
82827
Summary of the problem:  I have two disks re-configured as RAID 1. instead of copying the data to the empty disk, it deleted the data from the non-empty disk.  Here's what happened:  1. In the last few days, I reinstalled Windows 8 twice.  2. I had 2 disks configured as RAID 1 and 1 SSD contained the OS.  3. While reinstalling Windows 8 (1st time) on the SSD, I might have removed the RAID configurations from BIOS.  4. I made changes to the RAID disk.  5. I reinstalled Windows 8.  6. I noticed I see 3 disks (1 SSD, RAID-disk1, RAID-disk2)  7. RAID-disk1 was updated to my last changes (done after installing Windows 8 for the 1st time)  8. RAID-disk2 was updated to BEFORE installing Windows 8.  9. I formatted RAID-disk2  10. I set SATA configuration to RAID in BIOS.  11. After restart, the disks was automatically configured as RAID and with status rebuild.  12. In Windows 8 I get both disks as EMPTY!  How do I restore the data?
28532
I was wondering if anyone had any specific experience using Intel DC3700 SSDs (or similar) in the HP (DL380p) Gen8 servers?   I'm upgrading a set of database servers that use direct-attached storage. Typically, we use HP-branded everything in our server configs, and beyond a few SSD'd desktops (all of which have worked flawlessly), I have not otherwise used SSDs - certainly not in a server.   The servers we're upgrading run SQL Server (2005) on Windows. We're moving to SQL 2012. Current boxes host a single 200GB database on DL370 G6 provisioned with 72GB 15K SFF drives in RAID 1+0 as follows: OS (2 spindles), tempdb (4 spindles), t-logs (8 spindles), data (20 spindles). Performance is not an issue (CPU load is typically 20% / peak 30%, disk queues are typ = 1). The data volume disks are running in MSA50s off a P800 - so there's probably 5K IOPS there tops. The hardware is approaching 4 years old, and so it's time for a refresh.  Data usage, as reported by the individual hard disks, shows write volume of &lt; 100TB since deployment on the data volume; &lt; 10TB write on the transaction log volume; and ~ 1TB on tempdb.   That's the use case. Now consider a new, identical disk subsystem. It's going to run ~ $15K per server (34x 15K HDD @ $250 + 2x D2700 shelf + Smart array P421 for the external storage).   Consider a similar SSD deployment, say 6x 200GB SSD for the data volume, and 2 each (100GB) for OS, tempdb, and logging. Perhaps overkill, but using Intel DC S3700 for all with a second array card brings me in around $5K per server. Plus, it fits in one 2U box (use the expansion cage on the DL380p) and saves several hundred dollars in electricity every year. With the increased SSD performance, this might even cover some sloppy queries ;-).   An equivalent "no-worries" HP SSD solution is going to run ~ $10.5K. Twice the price with less warranty, lower endurance, but guaranteed performance and manageability.    Certainly, there are loads of in-between solutions that could work. I'm also quite aware of the vendor supported solution vs. 3rd party trade-offs. What I don't have is experience integrating these specific products to help quantify those trade-offs. I'm hoping someone out there does, and is willing to share his experience.   Questions that come to my mind are:  Does the S3700 play well in the Proliant environment with the Array P42x/P822 cards? If using the S3700, would there be an advantage to using a 3rd party card, say the LSI 9270-8i? How (well, easily) are firmware upgrades or management alerts accomplished with the third party solution as I've outlined?  If there are particular issues with the assembly, how have you worked around them - assuming you have?  With the changes that SSDs has introduced into the storage arena, storage solutions are way less straightforward than even a few years ago. I'm sure they will be very different in another few years, and we had expected to wait another cycle before seriously considering using SSDs in any server application.   Before I head too far down this road, is there anyone who would share their relevant experience with any of this? Please tell us why we're smart, crazy, or something in between.
101999
Hi guys I have question about how two different Hard disk setups can possibly affect performance of my database.   I have two Options.  Option 1:  One Physical Harddisk and then Multiple Virtual hard drives for SQL Server's Database files (.mdf , .ndf),Log files, TempDB, Backups etc   Option 2:  One Physical Harddisk and then One huge Virtual hard drive for SQL Server's Database files (.mdf , .ndf),Log files, TempDB, Backups etc     To my knowledge, If these were all physical hard drives, having multiple drives for all these files (tempDB, Log file, backups, database files), would definitely benefit from  parallel processing.  But is there any drawbacks of having one massive Virtual Hard drive vs multiple Virtual Hard drives as in reality, when Sql Server is reading or writing , it will be all done from one Physical Hard disk?   Is one method preferred over other? Any suggestions or pointers in the right direction is much appreciated. Thanks